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Retrofit or rebuild? How to decide for your greenhouse

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Many greenhouse operations are based on structures built decades ago. While these facilities can sustain production for years, rising energy costs, evolving crop demands and advances in climate control are prompting growers to reassess whether they need to renovate existing structures or invest in new construction. The decision depends on balancing performance, cost and long-term operational goals.

© Ceres Greenhouse Solutions

Start with the structure: Is your greenhouse still functional?
The first step is to assess the integrity of the structure. A sound frame and foundation often supports modern upgrades, making upgrading a viable option. Plants should check for corrosion, aging materials and structural damage, as well as whether the building can handle newer systems such as energy curtains or lighting. Design factors, including roof height and truss spacing, also affect airflow and system integration. If the structure remains strong and adaptable, remodeling can significantly improve performance without completely replacing it.

© Ceres Greenhouse Solutions

Common problems that greenhouse construction can solve
Older greenhouses often struggle with consistent climate control, resulting in erratic temperatures, moisture issues, and reduced crop yields. Aging heating, ventilation and insulation systems can also increase energy costs. Renovations can address these issues through better ventilation, improved heating, modern environmental controls and improved glazing. These changes can improve crop consistency while reducing operating expenses.

Case study: a real greenhouse renovation project
A 30-year-old greenhouse in Germany had problems with damaged glass panes and high wind exposure. Instead of rebuilding, a retrofit solution replaced the glazing with ETFE film using a custom track system. This improved light transmission, durability and plant performance, extending the lifespan of the structure. The staggered installation allowed production to continue with minimal disruption, meaning that targeted upgrades could provide significant benefits without a complete rebuild.

© Ceres Greenhouse Solutions

Signs it may be time to rebuild
Reconstruction becomes more appropriate when structural deterioration is severe or design limitations prevent effective improvements. Older greenhouses may have low roof heights, poor airflow, or limited capacity for modern systems, limiting climate control. Changes in crop type can also create the need for new construction, especially when moving to crops with different environmental requirements. In such cases, reconstruction can offer better long-term efficiency and flexibility.

Cost considerations
Upgrades typically involve lower upfront costs and shorter timeframes, often allowing for phased upgrades with minimal disruption. However, it may be limited by design limitations. Retrofitting requires a higher initial investment and longer construction time, but offers full design flexibility, improved energy efficiency and better scalability. Evaluating the return on investment requires consideration of both immediate costs and long-term operating profits.

When the hybrid approach works best
Many operations benefit from a combination of remodeling and reconstruction strategies. Renovating existing structures by adding new greenhouse spaces allows growers to gradually modernize. This approach can optimize capital expenditure, maintain production continuity and support expansion without completely replacing existing infrastructure.

© Ceres Greenhouse Solutions

Questions growers should ask before deciding
Key considerations include the condition of the current structure, the ability to support modern systems, the impact of energy costs and whether environmental conditions limit crop yield. Growers must also assess changes in crop requirements, future expansion plans and expected return on investment. These factors help determine if improvements are sufficient or if new construction is warranted.

Every greenhouse is different
There is no single solution for all operations. Each decision must be based on a careful assessment of the structural situation, production needs and long-term goals. A strategic approach ensures that investments—in retrofitting, rebuilding, or both—result in lasting improvements.

For more information:
Ceres Greenhouse Solutions
(email protected)
www.ceresgs.com

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Maximizing cannabis yields with intercanopy and subcanopy lighting

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Transportation Groups Warn Feds Of Marijuana Rescheduling’s ‘Consequences’ For Drug Testing Of Truck Drivers And Pilots

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A coalition of transportation and safety organizations said they have “serious safety concerns” about the Trump administration’s move to federally regulate marijuana.

Led by the American Trucking Association, the groups sent a letter to federal officials Monday asking them to take steps to ensure truck drivers, pilots, transit operators and other safety-sensitive workers continue to be tested for cannabis.

“If employers do not take the necessary steps to preserve the ability of security-sensitive transportation workers to test for marijuana, this change could have significant consequences for the safety of passengers and the entire transportation industry,” wrote Acting Attorney General Todd Blanche, Drug Enforcement Administration (DEA) Administrator Terrance Cole, Health and Human Services Secretary Robert F. Kennedy, and Transportation Secretary J.

The organizations said they understand that federal officials are being “urgently” reorganized under an executive order from President Donald Trump, that they are “deeply concerned that the current process does not adequately take into account agencies responsible for transportation safety or protecting the traveling public” and that they want the agencies to “work together.” ongoing cannabis redistricting hearings and rulemaking process to address these concerns.

In May, the Department of Transportation (DOT) issued new guidelines saying just that Truck drivers, airline pilots and other safety-sensitive workers still cannot use medical marijuana without penalty despite the Trump administration’s move to reschedule.

“Marijuana use is incompatible with safety-sensitive functions,” the department said.

Medical review officers (MROs) who receive drug test results indicating cannabis use cannot rule them out as negative for illegal substance use, even if an employee claims it was a result of state-licensed medical marijuana.

“Currently, there is no way for an MRO to verify that a laboratory-confirmed marijuana drug test result is positive when an employee claims the positive was caused by a state-licensed marijuana product,” the DOT said, explaining that after the reprogramming, medical marijuana dispensed under state law “does not” constitute a drug approved by the Food and Drug Administration (FDA).

The transportation groups said in the new letter that the DOT’s drug-testing program “is in accordance with the Department of Health and Human Services’ (HHS) Mandatory Guidelines for Federal Workplace Drug Testing Programs and HHS-certified laboratories.”

“While DOT has expressed its intention to continue testing marijuana, a commitment we greatly appreciate, it is unclear whether DOT will retain its ability to rely on HHS procedures and certifications after the rescheduling,” they wrote. “Without this alignment, DOT may retain the authority to conduct testing, but lack the scientific and procedural infrastructure to do so.”

“Practically, this would mean that truck and bus drivers, pilots, flight attendants, air traffic controllers, air mechanics, railroad workers, dispatchers and signal workers, transit operators and pipeline workers could continue to perform high-risk safety roles without a reliable means of verifying that they are not actively using marijuana. It relies on controlled substance testing to identify end use and prevent potentially impaired individuals from fulfilling their safety-related obligations. While the planning could create legal or regulatory loopholes, the regulated employer-based drug testing agency warned that the final rules should not jeopardize marijuana testing for safety-sensitive transportation workers.”

“Regardless of the broader policy goals of the review, the federal government should not move forward to preserve transportation drug testing programs and mitigate the risks of increased and unchecked deterioration of our roads, railroads, public transportation systems, pipelines, airspace, and maritime corridors,” the letter says.

The organizations specifically ask federal officials to:

  • Support long-term marijuana testing for all safety-sensitive transportation workers;
  • Confirm the authority of DOT-regulated employers to perform such tests;
  • Ensure HHS laboratory certification and testing guidelines remain available and aligned with DOT’s safety mission; and
  • Establish a coordinated federal strategy to address the transportation security implications of rescheduling.

“The public and the workers who keep our transportation system running safely deserve a process that ensures these safeguards are firmly in place before any final action is taken,” he said. the letter he says

Earlier this month, the House Appropriations Committee approved a provision to allow federal officials to continue requiring government employees and security-sensitive employees, such as truck drivers and airline pilots must be drug tested for marijuana, “regardless of any future change in legal status or schedule.”

This was followed by a press conference organized by prohibitionist groups and a drug-testing industry association, where both Republican lawmakers joined the proclamation. “Cut” to marijuana rescheduling by asserting that safety-sensitive transportation workers can still be punished for testing positive for THC.

Legislators and abolitionist activists argued that moving marijuana to Schedule III would lead to a 1986 executive order signed by President Ronald Reagan defining illegal drugs under the Controlled Substances Act (CSA) in relation to the use of cannabis by truck drivers and other airline employees.

Last October, Transportation Secretary Sean Duffy suggested that President Donald Trump was “putting pressure” on rescheduling cannabis.arguing that marijuana is “truly addictive” and that policy reform on the issue sends a “dangerous” message.

“At a time when the culture is encouraging and celebrating the use of marijuana, we’re not talking about risk,” Duffy said.

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Experts say THC percentage is the wrong way to shop for cannabis

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