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9 Best Cannabis Strains for Sleep



Choosing cannabis strains with sedative properties is all about the plant’s genetic makeup. Indica-dominant strains will be ideal for enhancing sleep, as they are renowned for their relaxing, full-body high. Sativa-dominant strains are known for their uplifting cerebral high, and may not be the best choice when looking for an evening strain.

The cannabis community is also focusing more on the terpenes and the entourage effect. Terpenes are the aromatic compounds that give cannabis plants their unique flavor profile, and they also influence the types of high we feel. Through multiple scientific studies, we have learned that specific terpenes like myrcene, terpinolene, and caryophyllene may contribute to the sedative and relaxing effects we feel from specific strains.

That said, here are 9 of the best cannabis strains for sleeping. 

1. Hindu Kush

Hindu Kush is a classic landrace strain that was first discovered in the 1970s. It is a resilient pure indica with an extraordinary resin production that originated from the Hindu Kush mountain range stretching between Pakistan and Afghanistan. It was voted one of High Times’ top 25 strains of all time, and it has remained a fan favorite.

Its terpene profile is commonly dominant in caryophyllene, limonene, myrcene, and humulene. It has a sweet and earthy aroma with hints of spicy charas. The effects will most likely make you feel calm, relaxed and sleepy. With high levels of myrcene and caryophyllene known for their potentially sedative properties, Hindu Kush is an ideal strain for those looking to enhance sleep.

This strain is short and compact, with an average flowering time of 45 and 50 days. Growers can produce up to 450 grams per square meter indoors and substantially more outdoor. It is also highly resistant to mold, making it an outstanding strain for beginners. Seeds are available in regular, feminized, and automatic varieties.

2. Northern Lights

Northern Lights comes from a combination of Afghan and Thai genetics. It has an extremely pungent odor that you can smell from miles away. Northern Lights is another great strain for making hash, as its flowers are coated with an abundance of trichomes. The most famous Northern Lights phenotype is Northern Lights #5.

Northern Lights’ top three terpenes are myrcene, caryophyllene, and pinene. Northern Lights has always been heralded in the medical community for its potential to help with pain and insomnia. It has incredibly potent effects that leave most users feeling slumped over in their chair. It is the true definition of couch-lock. Thus, Northern Lights, Northern Lights #5, or any hybrids with its genetics, tend to be great options for sleepy effects.

This cultivar is a fast-flowering plant which grows short and compact, thanks to its indica heritage. Expect a moderate yield of up to 450 grams per square meter inside, and over 550 grams per plant outside! You can get Northern Lights seeds as regular, feminized, and automatic seeds. Automatic seeds makes the grow process easier for novices, whereas experts might lean towards regular genetics.

3. White Rhino

White Rhino is an iconic indica-dominant strain created by crossing White Widow with Brazil, Southern, and Afghanistan landrace strains. It is a classic indica-dominant strain and perfect for the evenings.

White Rhino’s terpene profile includes high levels of myrcene, pinene, and terpinolene. The result is a cannabis strain with notes of freshly picked grape with undertones of musky hashish. It only takes a couple of hits of White Rhino from a vaporizer to feel its intensely potent effects. Consumers feel an initial uplifting euphoria before being overwhelmed with a high relaxing full-body stone. It is advised to put your pyjamas on before consuming this strain!

Cultivators will love White Rhino for its short flowering time, between 45 and 60 days and highly resinous flowers. Due to its 90% indica, genetics expect White Rhino to be short and stocky. Outdoors, White Rhino can be harvested in October, and growers can expect substantial yields of over 500 grams per plant.

4. Black Domina

Black Domina is a four-way indica-dominant hybrid created by crossing Northern Lights with Ortega, Hash Plant and an Afghan landrace. Northern Lights accounted for the resin production, Hash Plant for the short flowering time, and the Afghan landrace for its highly potent effect.

Black Domina expresses terpene dominance in myrcene, caryophyllene, and pinene. These terpenes commonly express relaxing qualities, and Black Domina is renowned for its spicy profile, peppery, and slightly fruity aroma and flavor.

This strain flourishes in a Mediterranean climate and has an exceptionally flowering period of approximately 50 days. Throughout the growing cycle, the foliage will turn a beautiful shade of dark green, and during flowering, purple pigmentation can be expressed in both the flowers and leaves. Growers have reported extra-large yields, with the outdoor harvest falling in October.

5. Blackberry Cake

Blackberry Cake is an indica lover’s dream! It was bred by crossing Wedding Cake, Black Domina, and Durban. The result is a strain that is expected to produce a heavy full-body high, with calming and somewhat uplifting effects.

Blackberry Cake tastes sweet and fruity with slight gassy notes, but also has an earthy, somewhat woody taste to it. The variety of flavors shows how complex Blackberry Cake’s genetics can be.

This strain has typical indica effects, and the consumer can expect a soothing, long-lasting body stone that will put the user to bed.

It grows short and stocky, and can be cultivated indoors, outside or in the greenhouse. Blackberry Cake has the potential to produce an extra-large yield and boasts an average flowering period of 40 to 50 days. It may require a little extra attention throughout the growing cycle, but it is an ideal sedative cultivar!

6. Mr Nice G13 X Hash Plant

Mr Nice G13 x Hash Plant combines two extremely potent strains to produce a highly sedating strain. It is a 100% pure indica strain created by crossing – you guessed it – Mr Nice G13 and Hash Plant. It has been known to have exceptionally high THC content with long-lasting effects that leave many people couch-locked.

Like its parent strains, Mr Nice G13 x Hash Plant has sweet and earthy flavors to it. The high is a long-lasting full-body stone, and is perfect for those looking for a sleepy cultivar.

This strain thrives outdoors in a warm, Mediterranean climate and has a flowering time between 60 and 65 days. Grown well, this strain can produce a large yield of up to 400 grams inside, and in optimal conditions well over 800 grams outside in open soil! You can get Mr Nice G13 x Hash Plant as regular seeds, which opens up the chance to do breeding projects with the strain.

7. Master Kush

Master Kush is a cross between two landrace strains from the Hindu Kush area. It is a potent strain that produces sleepy effects for people looking for an effective sleep aid.

Master Kush’s top three dominant terpenes are most often myrcene, caryophyllene, and limonene.

The combination helps give Master Kush a mix of citrus and earthy Kush aromas and flavors.

Additionally, these three terpenes have sedative, relieving, and uplifting properties, so it’s easy to see how Master Kush could make people feel sleepy.

During flowering, Master Kush flowers expressed a wide variety of purple, and orange-haired pistils amongst the dark green foliage. Master Kush produces short, compact plants and a medium yield. The flowering time is typically between 50 and 60 days, and this strain thrives in a cooler continental climate.

8. Big Bud

Big Bud was born in the Netherlands and proliferated in the United States during the 1980s.

It was created by crossing Afghani #1 and Northern Lights with Skunk #1, and has been used for breeding some of the hardest-hitting strains in the world.

Big Bud has a sweet, earthy, old school indica fragrance to it, and some describe the aroma as similar to molasses. This comes from the pinene, myrcene, and rare ocimene terpenes. Consumers can expect a sedative full-body stone; Big Bud is ideal for the evening as it is going to put you straight to bed! 

This cultivar has an average flowering period of 57 days grown indoors with the potential to gain a two-thirds in size once switched to a photoperiod. Big Bud thrives in warmer Mediterranean climates with longer summers, and the harvest will fall in mid-to-late October. It also has the potential to flourish in the greenhouse or indoors with the potential for extra-large harvests. 

9. Do-Si-Dos

Do-Si-Dos is a new school hybrid that consumers love for its pungent terpenes and relaxing effects.

It is a cross of Girl Scout Cookies (GSC) with Face Off OG.

It’s a well-balanced strain with earthy and gassy flavors, and Do-Si-Dos terpene profiles feature linalool, pinene, and limonene. Effects include an initial onset of uplifted euphoria before dissipating into a long-lasting full body-stone, guaranteed to send you to sleep.

For people who want to grow Do-Si-Dos, it requires some expertise and attention, but can be grown indoors and outdoors. To bring out those dark purple colors, you should initiate colder periods during flowering to bring out the anthocyanins in flower. Do-Si-Dos tends to have a pretty average yield, but the quality is undeniable.  

The ultimate hours?

In the end, there are hundreds of cannabis strains that can help you sleep. As you have seen throughout this article, many are indica-dominant strains and contain terpenes like terpinolene, caryophyllene, and myrcene. Choosing the best ones is all about personal preference, but to find which sleepy strains are right for you, you will have to try them and see!

  • Disclaimer:

    Laws and regulations regarding cannabis cultivation differ from country to country. Sensi Seeds therefore strongly advises you to check your local laws and regulations. Do not act in conflict with the law.

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autoflowering seeds

Top autoflower seeds to grow for winter ’22




Harvest season just wrapped but breeders keep selecting and testing new varieties for big releases into the winter. Autoflower seeds continue to add fans thanks to bag appeal and straight-up dankness that rivals photoperiod seeds.

“Now that we’ve got autos testing higher than photoperiods, we feel that’s a good representation of autoflowers,” said Nat Pennington, Breeder & CEO of Humboldt Seed Company. Nat’s recent Mint Jelly Auto is still such a barometer at 30%+ THC.

In this ever-expanding market, many breeders take their shot, but only a rare few really slam dunk it. Here’s a bunch of top-notch autoflower seeds to run over the winter.

Fresh from Mephisto Genetics

Mephisto Wedding Cake auto. (Courtesy Mephisto)
Mephisto Wedding Cake auto. (Courtesy Mephisto)

Auto leader Mephisto Genetics celebrates 10 years of automatic greatness with special releases and drops that have included classic faves like Forgotten Cookies and newer powerhouses like Mephisto’s Wedding. This frosty vanilla gas strain is a top-tier result of the legendary Seed Junky Wedding Cake cut crossed with Meph’s Double Grape x Creme de la Chem.

Daz of Night Owl Seeds recent re-release of funky Mango Isle crosses and auto regular seed F3 phenos of Chem 91 continues his trend of delighting growers. 

“I’m a people pleaser – I try to give my customers what they want,” said Daz during a chat last month with Leafly. “I like when people tell me it’s like Christmas morning when they open their stuff from me.”

Night Owl slays it via generous freebies, fun merch, and amazing genetics that easily convert any automatic skeptics. Just take a look at Jeremy Silva’s BuildASoil’s video series featuring the dazzling Strawberry Milk & Qookies grown beautifully within earth boxes.


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Tip: Save money with seedbank packs

Too poor for a big, expensive new seed release? The seedbanks got ya covered with special packages. 

“Three and five-packs are pretty much the money spot right now,” said Paul Lawl of Multiverse Beans, a top online bean bank. “With so much autoflower variety, why stay with just one strain?”

Purveyors like Gaslamp Genetics (Hembra Genetics), Multiverse Beans, DC Seed Exchange, and North Atlantic Seed Company feature packs of all varieties and sizes to satiate customer demand.

Great autos for hash

Atlas Seeds Tri-Cross. (Courtesy Atlas Seeds)
Atlas Seeds Tri-Cross auto. (Courtesy Atlas Seeds)

Almost any auto-seed cultivars that have solid genetics can make great hash. Many hashmakers grow autos year-round for quicker yields that can be squished or washed more frequently.

One such example is Coal Miner’s Daughter from Gnome Automatics. A result of @fullduplex_afn’s phenomenal selective breeding process, its fruity, spice and hashy undertones won 1st Place in the 2021 Autoflower Cup Extract category as an F5. Ronin Garden’s Rolling Thunder, Smoke, and The Ripple all glisten with insane resin coverage, making any solventless extractor smile regardless of skill level. 

See also: Pluto’s Bride & Black Strap by Gnome/Brother Mendel, Mephisto’s 4-Assed Monkey, & Pink Panama; or Tri-Cross & GMO Auto by Atlas Seeds. 

Gassy auto strains to grow

Night Owl Seeds Outlier auto. (Courtesy Night Owl Seeds)
Night Owl Seeds Outlier auto. (Courtesy Night Owl Seeds)

You’ve heard it all year—the game runs on gas. That’s no different in the autoflower world where gassy, fuel and pungent diesel dominate so many strains. Humboldt Seed Company will make you wonder who ran over a skunk with All Gas OG Auto—a cross of Humboldt Venom OG x Humboldt OG. This one produces big and may actually be louder than your next-door-neighbor’s Weimaraner. Wicked Witch by Magic Strains is a densely flowering, skunky fuel worthy of space in your tent, while Grease Gun is another Atlas gem with that gassy nose people want.

See also: indoor queen Methane by Gnome Automatics (Gaslamp exclusive); Mephisto’s 3 Bears OG, and Samsquanch OG; and Night Owl’s vigorous OG gas of Outlier C.

Candy and sweet auto strains

Mosca Seeds Gummy Mintz auto. (Courtesy Mosca Seeds)
Mosca Seeds Gummy Mintz auto. (Courtesy Mosca Seeds)

Consumers keep demanding candy and sweet terps, and Magic Strains funky grape candy Troubled Grape yields easy for any skill level. Mosca Seeds continues to serve candy-lovers with Gummy Bearz and Gummy Mintz – both colorful and tasty Gelato crosses that test high. Roc Bud Inc and their in-demand genetics are unstoppable these days with more autoflower varieties constantly around the corner. Grape Slurri, Raspberry Punch, Razz-Berry Runtz, and the fruit loops and gas of Blueberry Slushy are among those heralded. 

See also: meticulously pheno-hunted Frosted Cherry O’s by Mutant Genetics; bubblegum & cotton candy terps of Gnome’s Ace of Spades; and CBD-dominant Orange Candy & Rainbow Candy courtesy of High Alpine Genetics.

Fruity-smelling auto seeds

Atlas Seeds Froot by the Foot auto. (Courtesy Atlas Seeds)
Atlas Seeds Froot by the Foot auto. (Courtesy Atlas Seeds)

Twisted Tree brings home sweet berry flavor within Alien Moonrocks & Jimmyjacks – connoisseur automatics that could put certain blueberry farmers to shame.

Night Owl and those tasty Mango Isle F2 crosses loom big at the fruit stand like some kind of heady Vito Corleone. Mngo Mrrr—another bad creation from Ronin and Daz—is an easy grower with sweet flavors and bag appeal for days. 

See also: Phantomberry by Roc Bud; the aptly-named Lemongrass by HSC; Atlas’s Froot by the Foot; Ethos’s low-maintenance Planet of the Grapes; and the Bubba-esque fruit basket bouquet of Night Owl’s Pre-98 Episode 1 F4.

Viva sativa autos

Time is money, and autoflowers save growers mad money on sativa strains. Pina Colada by Mosca Seeds is that tropical sativa you’ve been looking for with citrus and pineapple flavors that complement its gnarly yields.

“It’s our most sativa-dominant auto strain,” said Mosca Rick of Mosca Seeds. “It grows airier like a true sativa too.”

ZaMango from Night Owl stimulates the endocannabinoid system with its psychedelic fruit medley that includes the true landrace sativa Zamaldelica Express in its lineage. Weed tweekers rejoice—these are seeds any dedicated sativa fanatic will love.

Derived from Archive Seed’s Amnesia Haze BX1 crossed with their own Walter White, Fugue State by Mephisto lends itself to some inspired sativa-derived chicanery as well. 

See also: Lost Elephant by Twisted Tree; terp & resin-rich Sour Orange Haze by Mephisto; Ethos’s sour Inzane & Citradelic Sunset; and the heavy colas of Mandela Effect by Night Owl.

Stay in the loop

OK, you’re ready to buy and pop some winter seeds. Ensure your tent or garden will be bearing buds that have a legit lineage, suit the traits you want, and will grow with vigor. Reading online autoflower reviews and grow journals is extremely helpful. Asking any questions within grow chat forums is also smart so you stay up-to-date.

Subscribe to Leafly Newsletters for news on big releases for the rest of ‘22 and into ‘23!

Breeders and seedbanks—elevate your seed brand with Leafly Advertising. 20% off with the code “Cali 2023”.

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Anthony DiMeo

Anthony DiMeo is a cannabis advocate and journalist who still believes countercultural evolution is possible. His work and advocacy has been featured in DOPE, Extraction Magazine, Terpenes & Testing Magazine, and the Philadelphia Inquirer.

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Understanding Water PPM for Cannabis




If you plan to grow cannabis, or even if you already have a few successful grows under your belt, sooner or later you’ll encounter the acronym “ppm”.

While it’s not usually necessary to obsess about ppm and you can grow outstanding cannabis without even knowing what ppm is, it pays to educate yourself about it because it can impact your grow—especially as you advance with your cultivation methods and technique.

Learning more about ppm will put you at an advantage.

What is PPM in Water

So, let’s lift the veil of mystery over what ppm is and how it can relate to growing cannabis. An acronym for “parts per million,” ppm relates to water solubles, including mineral and other substances, in the cannabis space. One part per million equals 1 mg of solubles for every liter of water.

This is a very small measurement increment. Parts per million are found in most types of water, from tap water to mountain spring water. Distilled or reverse-osmosis water are two of the only types of water that eliminated ppm. If you have your tap water tested for purity, the results will be measured in parts per million.

Analyzing your tap water will indicate if you would benefit from a water purification system for drinking water. Testing well water is especially useful because it’s devoid of fluoride and other additives found in most city water to minimize contaminants.

Most tap water that’s safe for drinking or cannabis use will have ppm in the 200-300 range, which is relatively normal. When water gets to several hundred parts per million, it indicates the pipes in your home may be somewhat old and an alternative water source may be beneficial for your cannabis.

How Do You Measure PPM?

To determine the level of ppm in your water, you will need a TDS meter (TDS is an acronym for “total dissolved solids”). So, if you use a TDS meter to measure your home’s tap water and your results come back as 200-300 parts per million, it means you have 200-300 parts per million of dissolved minerals in your water, which is in the normal range.

PPM and EC

Any serious conversation about ppm will also touch on ec; it almost seems inevitable since the two are closely related. EC stands for “electrical conductivity.” Using an EC meter measures the electrical conductivity in the water you’re using, and this reading is useful for measuring the amount of dissolved solubles in your water. A PPM meter and a EC meter essentially do the same things.

As a matter of fact, some TDS meters actually determine the level of electrical conductivity of a water sample and convert the results to parts per million. Simply stated, some TDS meter are really EC meters. Since the two are so closely related, brief mention must be made about EC.

PPM Relevance to Cannabis Cultivation

By this time, you may be wondering why knowing about ppm is important when growing cannabis. The main reason is to provide optimum nutrient amounts to your plants, while simultaneously avoiding burning them by overdosing them on nutrients.

If you’ve grown cannabis long enough and use a variety of fertilizers and soil additives, you realize that all fertilizers are not created the same and nearly every cannabis grower has a favorite. No one likes to see the telltale curled leaf tips and yellowing commonly associated with nitrogen burn in cannabis.

Although plants will eventually recover and be none the worse for wear over the long haul, burning does shock the plants and temporarily hamper them.

Eliminating nutrients altogether for a while will solve the problem, but as the old saying goes, “prevention is the best medicine.” Try to avoid burning altogether by being somewhat conservative with nutrients and additives (use one half to three quarters the suggested amount), and as a second step you can monitor the parts per million to dial in on precise nutrient dosing.

Water PPM and Nutrients for Cannabis

Since water ppm varies depending on the source, knowing the water’s soluble ppm right out of the tap will aid a grower when deciding how much nutrients to add to the water. Along with proper water pH, optimum ppm levels after adding nutrients can sometimes make the difference between adding too little fertilizer or too much. A person with a high tap water ppm can sometimes unintentionally burn a plant when following correct nutrient dosage and schedule protocol.

Plants can only absorb a certain amount of solubles and minerals, and you want your plants to receive the optimum amount.

A young seedling or a cutting (clone) will enjoy a ppm of approximately 500-600 and will respond positively to an increase of about 850 ppm during the medium and late stages of vegetative growth.

During the flower stage, optimum parts per million rises to 1000-1100. Clearly, cannabis plants enjoy increased parts per million as they grow.

Water ppm readings have applications for both hydroponic and conventional soil cultivation methods. With soil cultivation, the water ppm should be checked after adding additives to the watering vessel. For hydroponic use, check the reservoir. With too low ppm, add more nutrients, and with too high, dilute with water until you reach an optimum level.

TDS Meters

Like humidity meters, temperature gauges, and pH meters used for cannabis cultivation, there is a wide range of TDS meters on the market at affordable prices. TDS meters that measure parts per million differ somewhat. Some can read a higher level of ppm and can monitor other things like temperature. The range of measurable ppm on some of the fancier meters can go as high as 9999 ppm, but this is not necessary for cannabis cultivation. Using a TDS meter that goes to 3500 parts per million will serve your needs just fine. Anything over 5000 is unnecessary.

Before using your TDS meter to measure ppm in water, nutrients, and runoff, you’ll need to calibrate your device using a solution containing a certain level of ppm. Calibrating solutions can be bought online or at a grow supply store. Make sure your calibration fluid is at room temperature to avoid discrepancies. Follow the package instructions to test your fluid with your meter. If the ppm reading is correct, your device is calibrated. If not, follow your device’s instructions to calibrate it.


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Now that you know your TDS meter is up-and-running and precise, you can start using it to measure your ppm. Turn on your TDS meter, remove the cover from the bottom, and ensure it has a reading of zero before inserting the tip (about half an inch) of the meter into the water you’re testing. Below, you’ll find a list of the best TDS meters for your cannabis grow:

  • HM Digital TDS-EZ Water Quality TDS Tester
  • HoneForest Water Quality Tester
  • Generic Digital LCD TDS Meter Waterfilter Tester
  • Lxuemlu TDS Meter Digital Water Tester
  • Health Metric Professional TDS PPM Conductivity Meter

Understanding PPM Results

water PPM cannabis 1536x1152 1

To determine the exact nutrient intake of your cannabis plants, you’re going to have to measure the ppm of your nutrient reservoir and your runoff. Generally, the ppm reading of your runoff will be lower than the ppm from your reservoir. This shows that your plants are taking in nutrients when you’re feeding them.

As you can see understanding water ppm for cannabis is a key to getting cannabis grows right! PPM in water is a science in itself.

PPM Lower in Runoff

A low ppm runoff reading compared to the nutrient’s ppm reading is ideal. Keep measuring your ppm regularly to catch any significant drops. If your ppm drops from 1500 to 800 every day for a week, it means your plants are consistently drawing in the same level of nutrients.

For extremely low runoff levels, however, consider increasing your nutrient treat rates gradually.

No PPM Change

If there is no difference in ppm results between your nutrients and your runoff, we have a problem. That means your plants aren’t taking in the right level of nutrients. If this is occurring in your garden, consider checking your pH levels. Inconsistent pH levels can hinder nutrient intake. Nitrate and phosphate, for example, are best absorbed in certain pH ranges.

Lower-Than-Usual PPM in Runoff

If you notice lower-than-usual ppm readings in your reservoir, you may be losing out on nutrients due to nutrient lockout. Check for a white precipitate build-up in your nutrient reservoir. This can occur when some ions don’t mix well together and form a solid. Calcium phosphate is notorious for this.

To overcome this issue, make sure you’re properly mixing your nutrients as you add them and wash your mixing cup between nutrients.

Water PPM Higher in Runoff

A higher-than-normal ppm result from your runoff is rare, but this indicates that there’s a salt buildup at the root zone. The buildup gets stuck and gradually dissolves into the runoff leading to high ppm levels. Ensure you’re properly stirring calcium salts such as calcium phosphate, calcium carbonate, and calcium hydroxide. A line cleaner or flushing with water can help remove the calcium salt buildup.

Yellow Leaves

If your cannabis leaves are turning yellow, you’ll need to check your ppm results for your nutrient reservoir and your runoff. Ensure your nutrient levels (phosphates, nitrates, and potassium ions) are decreasing between your reservoir and runoff, showing that the yellowing isn’t due to any nutrient deficiency. Check for other element deficiencies. If nutrients aren’t the problem, your pH may be the source of the issue.

pH Changes

Is there a considerable pH increase or decrease between your nutrient reservoir and your runoff? A little discrepancy between pH levels is normal. Significant pH changes, however, are known as pH drift. Check for nutrient lockout, one of the main culprits for pH drift. Changes in pH can prevent the roots from absorbing certain nutrients, which is why it’s so important to regularly monitor for this.

Using Organic Soil

Testing your ppm can get tricky if you’re growing organically. Unlike using synthetic fertilizers, organically-assembled soil contains complex molecules that are gradually released over time. Because the organic soil has yet to break down the complex molecules into simple salts, your ppm readings may be hard to decipher.

Ppm readings from your organic soil won’t take into account the total nutrients in your soil that have yet to break down. When growing organically, pay more attention to your pH levels and signs of nutrient deficiencies or imbalances.

Is Measuring Water PPM Necessary?

Whether or not a TDS meter is necessary when growing cannabis depends on your water source and your cultivation goals. Certainty commercial operations should monitor it closely to maximize yield. For the private home grower, the decision depends on how much the grower wants to dial in on perfect cultivation methods and perfect his or her craft.

Measuring the salt and nutrient levels in the water is crucial to ensure the right amount of nutrients are fed. For instance, if you measure your ppm one day and get a result of 1,600 ppm and then measure your ppm the next day and get a 2,100 ppm reading, you know you added too many nutrients the day before.

There is no doubt that many cannabis growers have cultivated and harvested a large number of dank and sticky grows without giving parts per million a second thought. These same growers can grow outstanding bud without worrying excessively about grow room CO2 levels.

There are over 300,000 jobs in the cannabis industry. CTU trained me for one of them!

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When it comes to cultivation factors like ppm and CO2 levels, we’re looking at somewhat advanced procedures. These are choices that separate the novice cannabis grower from the advanced cannabis grower.

If you merely want to grow some good flower for personal use, you may want to skip it. On the other hand, if you want your grow to be as perfect and productive as possible, it would be wise to implement these advanced techniques.

If you ever want to advance to commercial cultivation with a cannabis company, do yourself a favor and learn about it—and put it to use now. You’ll be a more knowledgeable and successful grower as a result! Now that you are understanding water ppm for cannabis it’s time to get growing!

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Anyone can enroll at Cannabis Training University from anywhere in the world! Learn how to grow marijuana on a budget. Save money on your cannabis garden. Buy the right hydroponic equipment for growing weed.

Learn more about ppm in water in our cannabis cultivation courses.

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When and How to Flush Cannabis Plants




If you’re trying to control the concentration of nutrients in your cannabis plant, flushing may be the answer. It’s been used for various purposes, including fixing nutrient lockout and removing excess nutrients before harvest. Here’s how to flush cannabis plants the right way.

What Is Flushing Cannabis?

Flushing is an essential aspect of growing cannabis. It’s when you stop giving your plants nutrients and only feed them water, thereby flushing the grow medium of any nutrients left over.

Generally, flushing is performed right before harvest when growers are nearly ready to cut down the flower buds

However, flushing can also be performed when plants have a nutrient imbalance, such as a lockout or burn, preventing new ones nutrients from being absorbed. 

In many cases, flushing has helped growers correct suboptimal nutrient concentrations in the plant through any part of their growth.

Does Flushing Actually Work?

While many growers have seen considerable differences in plant yield and quality simply by flushing their plants, others are not as convinced about its benefits on cannabis.

Critics argue that flushing the nutrients pre-harvest deprives the plants of essential building blocks, especially as they get to the finish line of flowering.

In addition, there are no rigorous scientific studies on the benefits of flushing cannabis plants. It’s all based on anecdotal evidence.

Growers have long used environmental stressors to ramp up resin production, but it’s unclear whether flushing nutrients can help. Critics argue that plants need all the energy they can get to produce the highly-coveted trichomes, where the plant has its active compounds.

Plants need a high concentration of calcium to promote healthy cell division, or else risk delayed growth. In addition, some boron is needed for plant maturation. Long periods of flushing can affect your weed plants’ growth.

Flushing plants before harvest remains a popular practice in the cannabis growing community despite no solid evidence to back it up. Growers say that removing all the residual nutrients near harvest produces the highest quality flower from the flushed cannabis plants.

Benefits of Flushing Cannabis Plants

When flushing works, it works. Growers believe that removing the salts and nutrients not yet stored in the plant can force the plant to use its reserves more efficiently, similar to what happens if we reduce eating and our body burns fat to get energy.


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When Flush Cannabis Plants

Many growers recommend flushing all the nutrients two weeks before harvest, or when the trichomes are starting to turn from a clear to milky color. You can also flush during other growth stages if you see signs of nutrient lockout or nutrient burn.

Testing p

We recommend TDS, EC, and pH meters to control your water and soil’s pH, an important aspect of flushing plants. When the water is not in the optimal pH zone, nutrients can evaporate out of the solution, reducing the plant’s intake.

During flushing, the PPM of the rinse water goes down. You can stop the flushing process at any point and even allow some nitrogen to remain in the grow medium to keep the vegetative growth going. 

How to Flush Cannabis Plants

Most growers flush plants with plain water. We recommend using lukewarm water of about 75º F with a pH of 6-6.8 for soil-based grows and 5.5-6.5 for hydroponic gardens, the ideal ranges for nutrient flushing.

Some growers use chemical flushes that claim to help in flushing cannabis flower. However, there is no guarantee that these will work.

Flushing can be performed near the harvesting season, but it can also be performed every time you water your plants. Just add enough water so that about 10-20% drains, ensuring you don’t build up salts in your grow medium and have fewer build up near harvest. 

The flushing period can vary depending on the plant size, container type, and media. Flushing can take anywhere from 1-3 weeks. Plants usually have flowering periods running from 7-9 weeks. A plant with a 9-week flowering period may require flushing for 3 weeks.

Don’t worry if you notice your plant’s leaves turning yellow. This is a sign of nitrogen and magnesium nutrient deficiency and a normal part of this process. Losing potassium and phosphorus causes leaf curling and brown leaves.

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For sandy soils, a week of flushing should do the trick since there’s not much organic matter holding onto the nutrients. Porous loam can be flushed for 10-15 days, while heavy loams and clays should be flushed for 15-20 days, which hold tightly to nutrients.

Amended organic soil does not require much or any flushing at all. Soil microorganisms dissolve nutrients found in the organic matter and send them to roots as needed. They may need flushing if the bottom leaves aren’t  turning yellow. 

Ebb and flow and drip irrigation systems can be flushed for 4-7 days, since the media does not hold nutrients as much. Aeroponic, deep culture, and certain nutrient film techniques require 3-4 days of flushing. Peat moss and coco can be flushed for one week or less if the bottom leaves are already yellow.

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