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Greenhouse hygiene programs emphasize deep-penetration sanitation during cleanouts

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During winter clean-ups, greenhouse operators prepare facilities for the next production cycle, with hygiene remaining a critical focus. Effective sanitation during crop transition plays a key role in reducing pathogen pressure and promoting long-term crop health, particularly in operations that manage virus risks such as Tomato brown rugose fruit virus (ToBRFV).

Disinfectants commonly included in greenhouse hygiene programs include Intra Multi Des GA, supplied in North America by Houweling Americas. “This product is widely used by vegetable and ornamental growers as part of comprehensive cleaning and routine sanitation strategies, especially where deep penetration is required on complex surfaces,” says the Houweling Americas team.

© Houweling Americas

Getting under the surface
Biofilms and organic debris continue to limit the effectiveness of many disinfectants, harboring microorganisms in cracks, crevices, and porous materials. According to the Multi Des GA technical team, the formulation is designed to address this challenge through penetration rather than surface activity.

“Intra Multi Des GA has five active ingredients that work together to provide strong penetration properties, allowing the product to reach microorganisms hiding in difficult access areas,” the team explained. While not positioned as a dedicated biofilm remover, the formulation is intended to reveal and eliminate pathogens sheltered beneath biofilm layers.

For best results, a two-step sanitation approach is recommended: deep cleaning to remove organic matter and biofilm, followed by disinfection. “Skip the cleaning step increases the risk of completely eliminating pathogens,” the team noted, highlighting the continued opportunity for farmer education around proper hygiene sequencing.

The role of cleaning before disinfection
As part of the Intracare product portfolio, Houweling Americas also supplies Intra Foam Organics, a cleaner designed to remove organic material prior to disinfection. Organic debris can significantly reduce disinfectant performance if not completely removed, especially on high-traffic or porous surfaces. When used as a first step, cleaners like Intra Foam Organics help ensure that disinfectants can come into direct contact with target pathogens.

Performance on porous and uneven surfaces
Concrete floors, block walls and other porous greenhouse materials remain among the most difficult areas to sanitize. According to internal tests, Intra Multi Des GA works reliably on these surfaces, moving into the micro-cracks where pathogens can persist.

“When applied to porous materials such as concrete blocks, the formulation moves significantly across the substrate,” the team explained. “This behavior is different from traditional disinfectants that remain on the surface and do not reach the embedded microorganisms.”

© Houweling Americas

Broad spectrum pathogen control
Growers of all types of crops rely on Intra Multi Des GA to manage a wide range of pathogens, including fungal, bacterial and viral threats. The reported efficacy against ToBRFV has made it an essential component of hygiene protocols in tomato production.

“Intra Multi Des GA has shown excellent efficacy against ToBRFV and has proven effective in eliminating the virus on contact when used appropriately,” the team reported. Beyond viral control, growers also use the product against pathogens such as Fusarium and Pythium in crop and ornamental systems.

Waste behavior and crop turnover
Unlike non-residue disinfectants, Intra Multi Des GA is designed to leave a residual effect on treated surfaces during cleaning, providing extensive protection between crops. This waste is not intended to come into contact with the collected products, but is used to maintain sanitation during downtime.

Operational efficiency is another matter. The product is applied at a low concentration of use, requires a short contact time and usually requires only one application, allowing rapid crop rotations without compromising hygiene standards.

Long-term sanitation results
Growers who consistently incorporate Intra Multi Des GA have reported cumulative improvements in crop rotation hygiene programs over multiple seasons. In one documented case, a Dutch tomato operation managing ToBRFV reported no subsequent infections after integrating the product into the cleaning protocol.

“Starting clean remains one of the most effective ways to reduce the risk of early cycle infection,” the team emphasizes.

Supporting North American producers
Houweling Americas supplies Intra Multi Des GA and other Intracare solutions through established distribution partners and provides technical support to assist with implementation. In addition to hygiene products, the company’s portfolio includes nutrient solutions, growing substrates, LED lighting, water treatment technologies and biostimulants such as Intra Eco Shield, with Intra Boost, a next-generation willow bark-derived biostimulant, scheduled for a North American launch in early 2026.

Based in British Columbia and Ontario, Houweling Americas works closely with growers to develop integrated solution programs that support yield, plant health and resilience. The company is part of Royal Houweling, a Dutch family business founded in 1925 and recently recognized with royal status for its long-term commitment to horticulture and sustainability.

For growers seeking technical guidance on hygiene protocols or product performance, the Houweling Americas team encourages direct engagement for further assistance.

For more information:
Houweling America
1-800-252-5824
houwelingamericas.com

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‘We didn’t cherry pick our submissions”

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Hollandse Hoogtes received seven awards at the 2026 Highlife Cup, five of them in first place, using batches it was already sending to cafes in Holland, rather than material saved for the competition. The works were presented together with coffeeshop Club69 and John&co.

© Hollandse Hoogtes

The difference between LP and equity income
The Highlife Cup is run in lots selected by cafes from months of sales, which leaves room for an entrant to submit their strongest lot. Rick Bakker, CEO of Hollandse Hoogtes, didn’t have much to choose from. “We built our facility to have a harvest every week, so the cycle goes on and on,” says Rick. The company’s production is allocated as quickly as it comes off the line, so what went into the mug was the final version, the same flower that a customer would buy that week. Wins include Crumbled Lime’s first sativa, Zizi’s first indica, Rainbow Zizi’s house favorite, Fruit Punch’s hash and Karma Stardawg third place at WPFF, along with two edible awards.

This is the first year that licensed producers can enter the cup, in their categories, after being excluded the previous year. The jury conducts terpene tests on the entries, and scores put the regulated category above the illegal cafe entries in three of the five flower categories, with both illegal entries scoring higher than the regulated entries. Basic growers had months to select their best material to send, while Hollandse Hoogtes produced a standard weekly production.

Rick spends time in the cafeteria telling the employees where the company is going. “Being number one is a standard, not a trophy,” he says. “What I’m proud of is our people, from farming to hand cutting to logistics, they keep that motivation to be the best and produce week after week.”

© Hollandse Hoogtes

Cafes sold cannabis for decades without lab testing or stable genetics. “Everything we produce has to be tested, and we can consistently deliver consistent quality,” says Rick. “We have mother plants, all the plants come from those selected mother plants. That was unthinkable in the illegal market.” Cultivating all harvests with selected mothers allows the company to put regular production into a glass without worrying about which batch it is.

Genetics and inheritance
Hollandse Hoogtes works with two genetic houses, Karma Genetics and Amsterdam Genetics, both of which have long histories in the Dutch scene, and all of Karma’s breed and selection top positions come from this relationship. “We are very pleased that Karma has supported the start of Hollandse Hoogtes and continues to consult and support us.”

At the start of the experiment, growers got a short window to import cuttings of the developed genetics, which Rick describes as a day or two, when the rules briefly allowed, after which the path was closed. “The selection process now works from seed,” says Rick. When the company sees a gap in the market it selects seeds and conducts a full pheno-hunt of approximately 2,000 plants to judge how ten to fifty expressions of a single genetic grow together with others and the capabilities of the facility. Some basic genetics never worked well indoors, so selection continues.

© Hollandse Hoogtes

Dutch experimental cannabis market
Edibles come out of a kitchen run by a chef, Nicolas Vanderslyen, who spent ten to fifteen years in Michelin-starred kitchens before fully delving into cooking with cannabis compounds. Hollandse Hoogtes combines the flavor of rosin with the flavor of chocolate or gummy, combines its tiramisu praline with Super Silver Sweets rosin for the look of the cake, and the chocolate comes from a luxury chocolate house. Tiramisu Pralines took the first place and Cherry Cola Gummies came third. “We see it as an important category that helps people who don’t want to smoke but want to get the experience,” says Rick.

Hollandse Hoogtes prices in the premium segment. “If you look for the same quality products from coffee shops, you pay 25 to 35 euros per gram for a good type of Gelato, like our Rainbow Bacio (Karma’s favorite for roasting) and we sell that for 12 to 15 euros,” says Rick. In the middle of the market is an average of eight to eleven euros per gram of flower, and at the bottom are greenhouse crops that have not done well indoors, and stock that a grower needs to move, where Rick has seen similar offers for five grams of strain for €22.50.

Demand already exceeds what the company can grow. “Winning awards doesn’t help because the demand will grow,” laughs Rick. The facility opened with ten flowering cells and sixteen are under construction, an increase of close to fifty percent, with flowers from the new cells expected to be on the market in the second quarter of next year. Current cells run on Fluence VYPR LEDs, and in expansion the company plans to test HPS and under-lighting with its own nutrient recipes. In canopy size Rick ranks alongside Hollandse Hoogtes Village Farms after counting the new build, behind CanAdelaar (Cronos), which remains the largest among experimental growers in greenhouse production, while Hollandse Hoogtes is grown entirely indoors, a setup best suited to the Dutch climate.

For more information:
Dutch heights
(email protected)
www.hollandsehoogtes.nl

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DEA Picks Participants For Marijuana Rescheduling Hearing This Month, And Only Opponents Are Invited

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The Drug Enforcement Administration (DEA) has selected participants Hear about the Trump administration’s cannabis reorganization process this will begin this month—and only those opposed to the reform have been invited to participate.

On Thursday, the DEA began notifying parties who expressed their intention to participate that they had been invited to participate, and sending rejection letters to those who were not invited.

The invited participants are:

  • Drug and Alcohol Screening Association (NDASA)
  • Tennessee Bureau of Investigation
  • Smart Approaches to Marijuana (SAM)
  • The states of Nebraska, Idaho, Indiana and Louisiana
  • Voice of the Victims
  • Kenneth Finn, MD
  • Phillip A. Drum, PharmD

All organizations, individuals and officials have come out against marijuana reform, and some have filed lawsuits specifically trying to block cannabis reform.

Supporters of the reform who have expressed their intention to participate have not been invited.

According to several rejection letters seen by Marijuana Moment from cannabis reform advocates, the DEA said they do not meet the definition of “interested person” to participate because they “would not be harmed or harmed by any rule or proposed rule that may be issued.”

In a letter to the Drug Policy Alliance (DPA), DEA Administrator Terrance Cole wrote that the agency has “concluded that you have not demonstrated that you are harmed or harmed by the promulgation of a proposed rule to transfer marijuana, 21 CFR 1308.11(d)(23) 21 CFR 1308.11(d)(23), marijuana as defined in abstracts, 21 CFR. 1308.11(d)(58), and naturally derived delta-9-tetrahydrocannabinols from Schedules I through III of the CSA as proposed in the “Notice of Proposed Rulemaking” (NPRM).

“In fact, you state that the DPA supports the removal of marijuana from Schedule I and ‘does not object’ to the transfer of marijuana to Schedule III. Furthermore, the DPA states that any harm it would suffer from the NPRM would be to schedule marijuana in Schedule III. Because the DPA has not sufficiently demonstrated that the proposed rule itself is harmed or harmed, the DEA concludes that the DPA is not an “interested person.”

“Accordingly, the DEA is denying your request to participate in the hearing,” Cole told DPA.

Cat Packer, DPA’s director of drug markets and law enforcement, told Marihuana Moment after receiving the opt-out notice that “the rescheduling would leave the federal criminalization of marijuana largely intact and falls far short of what the public has asked for.”

“More than 70 percent of this public comments submitted on the proposed rule supported decriminalizationHowever, many patients, consumers, families, small businesses and individuals who have suffered the consequences of the ban — including arrests, incarcerations, family separations, housing barriers, immigration consequences and lost economic opportunities — have been excluded from meaningful participation in these proceedings, he said. dialogue, helping to shape the policies that affect their lives, families and communities.”

Michael Bronstein, president of the American Trade Association for Cannabis and Hemp (ATACH), said his group is “very disappointed” that not a single supporter of cannabis rescheduling was elected.

“The upcoming redistricting hearings will strictly include prohibitionist parties who oppose President Trump’s stance on redistricting. Now it’s up to the Drug Enforcement Administration to defend its rule,” he said.

SAM president Kevin Sabet, meanwhile, said his prohibitionist group “appreciates the opportunity to make our case” at the hearing.

“Rescheduling marijuana would be the biggest drug policy mistake in a generation,” he argued in a statement. “SAM looks forward to presenting the science, data, and public health stakes that show why reprogramming should be rejected.”

The hearingwhich will be overseen by a DEA administrative law judge, will begin on June 29 and conclude no later than 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, in the upcoming hearing, marijuana III.

In order to be considered for participation in the hearing, the parties had to submit requests, indicating their interest in the procedure, the claims or issues they want to hear and their position on these issues.

“The purpose of the hearing is to ‘receive factual evidence and expert opinion’ on whether marijuana should be transferred to Schedule III of the controlled substance list,” Blanche’s initial statement in April said.

The attorney general will also select an administrative law judge (ALJ) to oversee the proceeding.

“The ALJ’s authority includes the power to hold conferences to simplify or determine the issues at the hearing or to consider other matters that may assist in the expeditious resolution of the hearing; to require the parties to state their position in writing; to sign and issue subpoenas; to compel the production of documents and materials to the extent necessary to conduct the hearing; to examine witnesses; to direct, exclude, or testify; the Rule on Procedural Matters and the President’s DEA Hearing Procedures and Administrative Procedure Actions allowed under the law, Blanch wrote.

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 DEA Reorganization Denial the letter To the Drug Policy Alliance below:

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More flexibility to manage light, condensation and UV with extended Solarweave range

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For over 50 years, Solarweave has been a woven covering solution for greenhouse and polytunnel applications. First introduced in the 1970s, it was developed as a sustainable alternative to plastic films and is recognized for its long life, strength and consistent performance.

Designed and manufactured in Australia, Solarweave is designed to withstand demanding growing environments, including high temperatures and high winds. Today, it is used worldwide in many protected cropping systems.

Building on this heritage, GALE Pacific has expanded the Solarweave range with the new D40 and D60 variants, giving growers greater flexibility to manage light, condensation and UV exposure while maintaining the durability that Solarweave is known for.

© GALE Pacific

Light performance optimized for modern grow systems
The extended Solarweave range allows growers to select the right balance of light properties and anti-drip performance for different crops, climates and structures.

Solarweave D40 and D60 gradually increase fog, light diffusion and UV protection. This allows more light to penetrate through the crop canopy and helps reduce plant stress and disease risk in greenhouse environments.

Long life for stronger life value
Unlike plastic films that often need to be replaced every few seasons, Solarweave is used for 15 years or more in greenhouse and polytunnel applications.

This extended service life reduces replacement frequency, labor requirements and downtime during the life of the structure. When evaluated over time, many growers believe Solarweave provides a greater return on investment by avoiding the recurring costs and downtime associated with film replacement and disposal.

Built for real-world production
Solarweave is repairable, allowing localized damage to be repaired on site rather than replacing the entire coating. This is a practical advantage for continuous commercial growing operations.

With decades of proven performance, Australian manufacturing expertise and a wide range of options, Solarweave continues to evolve while remaining a reliable solution for long-lasting greenhouse covers.

For more information:
GALE Pacific
Email: (email protected)
galepacific.com/

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