Whether it’s cannabis or produce, every grower faces a constant battle against mold and similar threats. Cannabis is particularly vulnerable, as its humid growing environment and the physical structure of its flowers create an ideal breeding ground for many pathogens. Fruit, vegetables and cut flowers, on the other hand, often die in large quantities as they sit in containers or trucks before reaching their final destination.
For the past two years, DDH has been working with an industrial plasma manufacturer to adapt cold plasma technology for controlled environment agricultural and shipping environments. The result is a variety of products sold under the name Quantum Clear (QC).
plasma
DDH’s Travis Higginbotham says the original inventor had used plasma technology in other sectors and was looking for a partner to bring it to agriculture and horticulture. “It took us two full years of design and testing to get the equipment to work in grow facilities, centralized HVAC systems, shipping trailers and cold rooms,” he said. The company has collected data on various USDA fruit crops, third-party air quality testing for 50 different pathogens and volatile organic compounds such as ethylene, and pilot projects with large ornamental and cannabis operators.
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The appeal of this approach, Travs points out, is that the plasma field does not produce ozone, which is a concern with some current plasma technologies. The company has UL and Carb certifications, which verify that there is no ozone and that the units are safe for plant and human workplaces.
Preservation of products
The way it works is pretty simple, practically speaking, at least. Air enters on one side of the device, passes through a plasma area and exits on the other side. In this area, gases are energized into a plasma state that produces reactive oxygen and nitrogen species, including hydroxyl radicals and hydrogen peroxide. These compounds interact with airborne pathogens and organic molecules. “The idea is to create an area in the environment that breaks down the cell walls and changes the structure of certain compounds,” explains Travis.
Fruit storage and shipping environments have been an early focus. “The combination of darkness, low temperatures, humidity and well-packaged produce creates ideal conditions for mold,” he says. “Less air exchange and increased ethylene levels also encourage faster fruit ripening and smoother texture. USDA work with bananas, tomatoes, apples and strawberries showed that shipments treated with cold plasma maintained quality and had virtually no visible mold.”
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Due Diligence Horticulture has designed versions of the unit for shipping containers, refrigerators, HVAC systems and growing spaces. This enables flexibility throughout the supply chain, providing redundancy and centralized air handling.
All of this potential implementation was also based on the company’s focus on safety, Travis noted, not just for the humans working in the grow rooms, but for the plants as well. Several data sets suggested neutral or positive effects on performance and quality, although the company is still gathering more information. “We’ve doubled and even tripled the application capacity without negatively affecting the pistils of cannabis flowers. The technology is gentle on the plant, but destroys pathogens.”
cannabis
For cannabis growers, interest centers on airborne pathogens associated with empty fills, including aspergillus. “Operators also want to cut down on powdery mildew losses or limit the cost and frequency of IPM interventions during flowering. Since plasma treatment can be applied from tissue culture rooms to post-harvest spaces, trials have looked at how the units behave during the crop cycle.” The graph below shows the results of a producer trial in November 2025 where the Aspergillus count was reduced by 90% after 4 days of use.
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Growers of vegetables and ornamentals are also in trouble. Trials in shipping with coastal farms and cooler storage with Metrolina Greenhouses have been completed, and further work is underway in Central American Tissue Culture facilities and other controlled environments with good air exchange.
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Travis emphasized that installation is easy compared to systems that rely on chemical injection. “The units are stand-alone boxes designed for different voltages and room sizes. There is no subscription service attached to the equipment, and the devices come with a standard warranty and optional extended coverage. DDH also offers financing to help manufacturers secure Quantum Clear cold plasma units.”
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In various studies, the company reports an average reduction of 87.2% in airborne pathogens in less than a week and a greater reduction of over 95% when the units are run continuously for up to a month. “It’s a practical tool for growers who want to not only monitor air quality, but better understand air quality management.” he says “He’s responsible for getting the technology into the hands of producers through our testing program and QC to make sure it’s the solution they expected.”
Want to know more? tune in DDH December 10 webinarth at 10:00 a.m. PT. Click here to register.
For more information:
Due Diligence Horticulture
www.ddhort.com