Cannabis Cultivation and Science Podcast · Tad Hussey

Episode 143: Trends in Environmental Controls with Dr. Greenhouse

·1 hr 16 min·4 clips

Calcium is the exception: it moves with water, so airflow can create leaf tip burn.

Tad Hussey opens by speaking with Dr. Nadia Saba, who is also known as Dr. Greenhouse. She is the president and founder of Dr. Greenhouse, an agricultural and mechanical engineering firm focused on HVAC systems for indoor plant environments. Her background brings engineering language into a grower's problem set. That is the frame here. The discussion starts from a practical question about how environmental control affects plant performance rather than from theory alone. Air movement becomes the central example. Too much velocity, she explains, does not simply help a room. It changes what the plant chooses to build. In cannabis flower production, high air speed pushes the plant toward more stem, petiole, and leaf growth. That can come at the expense of flowers. She gives a simple working target for air speed. Roughly 0.35 to 1 meter per second is the range she points to. In familiar units, that is about 200 to 350 feet per minute. Beyond that, the room is not ruined, but the plant is more likely to behave vegetatively than generatively. The episode also makes room for the everyday mistakes that growers actually make. Hussey brings up a fan that fell over and blasted one area of a room. The resulting leaf damage becomes a way to talk about what the plant is doing internally when the environment is too aggressive. Saba answers in a way that keeps the science usable rather than abstract. The result is a conversation that turns HVAC into a cultivation decision instead of a distant technical specialty. It is especially useful for growers trying to make a room produce flowers instead of just sturdy-looking plants.

As heard by us

Airflow and fan velocity are treated as practical controls that can push a cannabis room toward structure instead of flowers.

Airflow gets treated here as a working variable, not a side note. Tad Hussey and Dr. Nadia Saba keep coming back to fan placement and air speed, showing how those choices can steer a cannabis plant toward structure or flowers.

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Your fans are shaping the crop more than you think.

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