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Nighttime humidity is not a problem that needs to be vented away

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Night hours present a persistent and costly challenge for commercial greenhouse operators. When the thermal screens are closed and the ventilations are closed, the greenhouse is closed, trapping the moisture produced by the crop. This creates a high-stakes battle against condensation, disease and unnecessary energy loss. Amir Kandlik, B.Sc. Plant Science and Genetics in Agriculture and agronomist with Drygair explores the critical problem of nighttime humidity and explains the strategic shift from traditional ventilation-based control to a system built around active indoor dehumidification. “This ‘closed greenhouse’ approach improves energy efficiency and supports stronger crop health.”

© Drygair

Night challenge: Thermodynamic and pathological risk
“At night, plants continue to transpire even though photosynthesis has stopped. Without the drying effect of daytime conditions, the air mass in the greenhouse quickly approaches saturation,” says Amir. “Traditional methods rely on ventilation, but ventilation replaces warm, CO₂-rich air with cold outside air. This increases heating demand, destabilizes temperatures and can introduce more moisture, especially in humid weather.”

A variation of this, heating the air before it is vented, wastes energy because the air conditioner is blown out immediately. “In cold, rainy, or snowy conditions, ventilation becomes impossible and humidity increases unchecked. As relative humidity rises above 85 percent and temperatures drop, surface temperatures can drop below the dew point. Condensation then forms on leaves, fruit, and structural elements, creating conditions that promote Botrytis, powdery mildew, and powdery mildew.”

Solution: “Closed” paradigm with active dehumidification.
A more advanced strategy replaces night ventilation with active internal dehumidification, keeping the greenhouse closed. Amir explains that it starts when the unit pulls in moist air, cools it below its dew point and condenses the water vapor into liquid form. “The latent heat released by condensation is captured and recycled, heating the dry air before redistributing it throughout the cottage. Instead of losing heat to dryness, this method converts moisture into heat and creates a net positive energy cycle.”

© Drygair

Basic advantages of the closed night strategy
This approach improves disease prevention by maintaining a stable vapor pressure deficit and preventing dew formation. Keeping surfaces above the dew point significantly reduces disease pressure. Flower tests recorded a 98% reduction in Botrytis when relative humidity remained below 85%. Energy efficiency is also increased because the airfields remain closed and latent heat is recovered during dehumidification. Vegetable producers have reported energy savings of 50%.

“Climate uniformity is improved as constant air circulation removes microclimates, and sealed conditions store CO₂ for uptake at dawn,” says Amir. Crop quality and yield benefit from consistent transpiration and improved movement of nutrients and calcium. Basil had a 15 percent yield increase without downy mildew, and unheated tomato houses had a 25 percent higher yield per stem.

Practical settings for leaders
Adopting this strategy requires changing the operational logic, which is usually handled by a climate computer. “During the day, the vents are open and the natural ventilation manages the humidity, so the dehumidifiers are turned off. At night, when the outside temperature drops below the indoor set point, the vents and screens close, and the dehumidifier operates at an RH of about 75 to 80 percent. The priority is to maintain a dew point range of at least 2 degrees. While heating is used only for temperature stability, nighttime temperatures stay below 10 degrees Celsius. in regions with , an additional defrost coil is required for continuous operation.

Looking at the field results
Field studies show that flowers grown according to this strategy maintained lower relative humidity, achieved significant energy savings and did not require night ventilation. Basil trials showed a 15 percent increase in yield and zero downy mildew. Tomatoes and peppers have seen a 5 to 25 percent increase in yield and a 98 percent reduction in disease. Cannabis growers recorded 30 to 40 percent higher yields with about 50 percent energy savings.

Specific questions about geography and climate
In very cold climates, this view is especially good. Ventilating at minus 10 degrees Celsius creates an extreme heating load, and sealing the greenhouse and dehumidifying the interior retains heat, recovers latent heat and reduces boiler use. In hot and humid climates, night ventilation is unreliable during warm or rainy weather. Active dehumidification removes moisture in a controlled manner, and with additional Air-Water Heat Exchange, the system can heat or cool the air through an external water loop.

Supporting scientific and technical references
Research includes Elad and Shtienberg’s work on Botrytis cinerea, University of Massachusetts Extension greenhouse moisture reduction guidance, Stanghellini’s transpiration studies, and Ho and Adams’ work on water and nutrient uptake in tomatoes.

Without ventilation
“Nighttime humidity is not a problem to be banished, but an imbalance to be managed,” says Amir. “The closed greenhouse strategy treats moisture as an energy resource instead of a waste product. By keeping greenhouses closed at night and using active internal dehumidification, growers can reduce disease, improve energy efficiency, retain CO₂, stabilize the nighttime climate, and increase yield and crop quality. This is one of the most impactful changes in modern greenhouse climate management.”

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Village Farms International leads B.C. cannabis producers in global export push

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Village Farms International, one of the world’s largest cannabis production facilities located in Delta, BC, increased its export volumes by more than 500 percent by the end of 2025, with international sales reaching US$37.9 million, or just over 20 percent of total cannabis revenue of US$188 million. The main export markets are Germany, Australia, the United Kingdom, New Zealand and Israel.

The company is also expanding, developing an additional 550,000 square feet of greenhouse space across the street from its main facility, designed to support both domestic and international cultivation. Orville Bovenschen, VFI’s global president of operations, points to the excise burden as a permanent strain on the domestic economy: “If you look at how much we paid in excise last year, it’s astronomical,” he says, although VFI declined to provide specific figures.

Walker Patton, one of the founders of the BC Cannabis Alliance, which represents about 50 licensed growers in the province, frames the domestic regulatory environment in stark terms: “With the rules that this industry was set up for, it’s like doing business right out of the gate.” Canada’s excise tax structure charges by weight instead of market price, meaning that since wholesale prices have fallen to roughly half of initial projections, effective tax rates for producers have risen.

© This is Holland

Sweetgrass Cannabis, a micro-farm located in the Kootenay region, now derives 60 to 70 percent of its sales from international markets after retreating from provinces such as Ontario and Alberta. Company CEO Gemma Hayes says: “Margins, as well as export opportunities, drove our decision.” Ontario’s wholesale markup of up to 25 per cent, layered with excise taxes, spurred what Hayes described as a “race to the bottom.”

Rubicon Organics, a Vancouver-based publicly traded company, entered international markets last year and recently opened a 47,500-square-foot facility in Hope in part to meet overseas demand. Speaking from the International Cannabis Conference in Berlin, Mathieu Aubin, director of marketing and new business, said: “Canada is very well positioned to access international markets for reliable and safe cannabis,” noting that reliability and product integrity are key to gaining access to the medical market.

Not all producers have equal access to these markets. Alex Rumi, founder of grower Good Buds out of Salt Spring Island, said established export markets are structured around an indoor pharmaceutical-style model that hurts sun-grown cannabis, and that Canada’s export system “works for big growers and doesn’t work for craft.” Julia Cameron, president of Cannabis Cultivators of BC and chair of communications and corporate affairs for the VFI, added that growers must secure permits for each shipment while navigating different rules across countries, creating a prohibitive barrier for small operators.

BC has more than 200 licensed growers and accounts for roughly a quarter of Canada’s legal cannabis production, but represents only 14 percent of national exports. Lana Popham, B.C.’s Minister of Agriculture and Food, points to the FIFA World Cup games in Vancouver as a near-term possibility: “It will be interesting to see how many people engage with what is a great product here in B.C.”

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Congressman And Other Media Outlets Join Marijuana Moment’s Push For DEA To Livestream Rescheduling Hearing

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The momentum of the Marijuana Moment request for direct public and media access to historic federal cannabis rescheduling hearings they are being joined by a member of Congress and other reporters starting next week.

Representative Steve Cohen (D-TN) sent a letter to the head of the Drug Enforcement Administration (DEA) on Friday, calling the ongoing marijuana rescheduling process “historic.”

“I am writing to request that the hearings be made available to the public in real time,” Cohen wrote to DEA Administrator Terrance Cole. “Live streaming technologies have become ubiquitous and a common way for Americans to interact with the government. In late 2024, in a similar effort, your agency authorized live streaming of proceedings ‘due to the public interest in this matter’ and continued your agency’s ‘commitment to procedural transparency.’

“I see no reason why that reason wouldn’t hold today, especially when it comes to such an important and impactful issue,” the congressman wrote. “I have long been an advocate for transparency in court proceedings and I believe this is a rare opportunity to inform the public about rulemaking and administrative litigation.”

Cohen’s letter follows a couple Marijuana Moment’s attorney presented the petitions to Cole and DEA Chief Administrative Law Judge Derek Julius. to request access to a live stream of the hearing on the proposal to move cannabis from Schedule I to Title III of the Controlled Substances Act (CSA) — which includes only opponents of the reform as participants.

Also on Friday, an attorney from Portfolio Media, Inc., which publishes Law360, sent Cole a letter saying it “agrees with Marijuana Moment’s request” for streaming access.

“This approach is consistent with DEA’s prior approach to this hearing and the compelling public interest in rescheduling marijuana under the CSA, a policy change with profound social, legal, and regulatory implications,” the letter states.

Requiring observers to attend in person “limits real-time information about a consequential policy development to the press and a small audience in attendance, and removes the ability of the press to report on that development,” he says. “Live streaming is a safe, continuous and fair way to ensure meaningful public access and advance the DEA’s stated commitment to transparency.”

Separately, an attorney representing the cannabis publication Cultivated Media and also on behalf of New York Times reporter Ashley Southall sent a letter to the DEA administrator saying they “want the ability to monitor the proceedings in real time, to provide readers with reports on the progress and perspective of testimony and evidence during the hearing.”

“Cultivated Media, Ashley Southall and Marijuana Moment and all the other media because of this access to the live stream can simultaneously report on issues of important public concern related to a historic hearing,” he said.

The DEA announced Thursday that it would make the transcript available at the end of the multi-day hearing, but Marijuana Moment attorney Joseph A. Bondy wrote in his letter Thursday that it would not help the public follow the proceedings in real time on a daily basis.

“The final transcript is useful, but not a substitute for access to a live broadcast. A live broadcast allows the public and the press to observe the hearing as it unfolds without contesting admissions, filling the courtroom, or disrupting the proceedings,” the letter to Cole says. “After reviewing, correcting and releasing the transcript weeks after the testimony, the opportunity for real-time observation, timely reporting and public information response has passed.”

“For a large public audience seeking serious coverage of federal cannabis policy, Marihuana Moment is an important channel through which the public can understand these proceedings.”

“To the extent that the DEA now believes that live streaming is inappropriate, despite the DEA’s prior directive in this rulemaking, Marijuana Moment respectfully requests a written explanation identifying the specific basis for that conclusion, including why the public interest and transparency that previously warranted live streaming are being overridden here,” Bondy wrote.


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Separately, cannabis advocates sent a letter Thursday to Julius, the DEA judge, saying he would not consider submissions from outside parties, also requesting access to the live stream.

“Many of the patients most interested in this procedure cannot travel to Arlington, Virginia. Many are disabled, immunocompromised, elderly, financially limited, or managing serious medical conditions,” states the letter from Americans for Safe Access, Veterans Initiative-22, US Pain Foundation, Realm of Caring, Montel Williams and others.

“Patients and advocates who can travel will also be unable to physically wait in line for an uncertain chance of admission, only to be turned away when limited seats are filled,” they wrote. “So the audience may technically be open to the public, but virtually inaccessible to most.”

Meanwhile, the DEA said in a new filing that its witness list for the hearing includes a doctor. Testify on “How Medical Marijuana Provides Medical Benefit to Pain Patients.”

Separately, the opponents who are participating in the trial have presented their declarations this week anticipate the anti-marijuana arguments they intend to make during the procedure.

The hearing it will start on June 29 and end before July 15.

Acting Attorney General Todd Blanche in April He issued an order that immediately reclassified the state’s licensed medical cannabisas well as marijuana products approved by the Food and Drug Administration (FDA) under Schedule I through Schedule III of the Controlled Substances Act (CSA).

According to a separate order signed by the acting attorney general, the upcoming hearing will include Class III marijuana.

Preliminary hearing process on the marijuana redistricting process initiated by the Biden administration It was halted last year amid allegations of improper communications and witness selection.

the current The marijuana redistricting process is being challenged in several ways which have been upheld by a federal Court of Appeals. those pieces of State attorneys general have filed lawsuits against cannabis reform, Opponents of marijuana legalization and a a cannabis-based biopharmaceutical corporation.

Meanwhile, the reorganization of state-licensed medical cannabis is already having a major impact.

The Congressional Research Service published a report on the current rescheduling of cannabis Certified patients with medical marijuana from state licensed dispensaries are now eligible for Class III. “The order appears to allow end users to use marijuana medically without a CSA prescription,” he says.

The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) has published a Draft update to a gun purchase form to recognize the legal status of medical marijuana in the reprogramming. The revised section of the question states that only the “recreational use or possession of marijuana” is federally prohibited, omitting the prior form’s mention of medical cannabis.

The US Treasury and Internal Revenue Service (IRS) said they plan to issued new tax guidelines for the marijuana industry after reprogramming. The reform will benefit state-licensed marijuana businesses by allowing them to take federal tax deductions that are currently prohibited under IRS Code Section III, known as Section 280E.

Even the DEA, which has long opposed cannabis legalization and accused the Biden administration of stalling the initiative in the reorganization process, has done so. It launched a registration process for legal marijuana businesses in the state to take advantage of the federal benefits that come with the reform.

The Department of Transport, on the other hand, issued guidelines stating this use Legal medical cannabis in the state is still no excuse for truck drivers to test positive for drugspilots and other safety-sensitive personnel.

A congressional committee recently Federal officials voted to block further steps to reschedule cannabis.

read it the letters About DEA admin access to live streaming:

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New access solution for cannabis facilities designed to address limitations of traditional gates

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SpaceGuard Products, a North American manufacturer of wire mesh security solutions and security protection systems, has released the BeastWire® Tunnel Door. This access solution is designed to overcome the limitations of traditional balanced doors and is aimed at cannabis cultivation, processing, packaging and distribution environments. The BeastWire Tunnel Door is designed for installations that require vertical clearance, reliable movement and floor space efficiency.

The BeastWire Tunnel Door provides top clearance with no tracks in the operating path of the door. It is suitable for spaces where overhead paths are not feasible, such as facilities that use high-mast forklifts, oversized pallet loads or specialized material handling equipment. Tall equipment can pass through the opening unhindered, allowing for continuous workflow and flexibility in equipment movement.

© SpaceGuard Products

The door uses a track system designed to create consistent movement. This addresses issues such as stuttering, binding, and misalignment that can occur with conventional sliding or counterbalanced designs. The track controls the path of the door so that the locking mechanism aligns with each cycle, allowing operators to close the door with relatively low force.

Unlike lower track systems that require a soil trench, the BeastWire Tunnel Door mounts above ground. This avoids cutting the installation slab, simplifies installation and reduces maintenance requirements. The system can be installed as a retrofit or in new construction, without changing the floor.

© SpaceGuard Products

The door frame and retractable design reduces the need for side supports and additional space on the side of the door. This results in a smaller footprint and more usable surface area. The gate has the same construction approach as other BeastWire systems.

The BeastWire Tunnel Door is a high-access door designed for strength and ease of use in cannabis industry facilities.

For more information:
SpaceGuard products
Email: (email protected)
spaceguardproducts.com/










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