Gardeners all over the world love their off-season indoor crop yield, but it takes experience to truly know how to maximize the potential. Relative humidity rising above 80% can result in mold spores developing while allowing the ambient temperature to drop below 60 degrees can allow the crop to be exposed to frost. One can maintain this temperature/humidity relationship best with Dutch greenhouse fans.
The object is to keep the inside of the growing room the same as the ambient air would be at the height of growing season, around July. In nature, the relative humidity rarely goes above 80% and the temperature almost never drops below 60 degrees during the peak summer months. In seasons where there is too much humidity, or an outside influence such as volcanic activity elsewhere on the planet impacts the temperature, there have been devastating losses to farming crops.
The point behind these growing spaces is to have a harvest of vegetables during the winter, or be able to grow vegetables at all in extremely northern climates. The fan one chooses for this room, if it is a fan designed for that purpose, will also act as a heater and warm the air before it gets to the leaves. Allowing the room to grow a chill, or get below around 60 degrees, can kill an entire crop in one night.
In order to have a successful growing space, it is vital to maintain the right air mixture in order to achieve ample but not excessive humidity in a warm tropical-like environment so that mildew does not develop. Many people sneer at the price of this system, however, and will try to cut corners. Too many corners being cut can mean the cost of the room itself is money lost.
Utilizing a box fan and a space heater is not adequate for many plant rooms, especially ones that are rather large. If the room is too big, and they do not have the set up adequate to maintain proper air circulation, then their first growing season will fail. If mold gets in, then it will kill everything in the room, and getting it cleaned out can be extremely difficult.
The box fan idea can work if the growing room is small enough, so long as the air is allowed to circulate adequately. The room should be able to maintain a constant 70 to 75 degrees, and never be allowed to go below 60. The key is to have the fan elevated to roof level and pointing down at the plants.
If one is attempting to create a very large space on a limited budget, going to old homes marked for demolition, or even a metal recycling store, might offer an opportunity to get an old attic fan. This, mixed with a decent-sized heating source can get one through a couple of growing seasons.
When the room has an excellent air mixture, then not only will plants survive but they will thrive. One can increase the carbon dioxide level at the same time they heat the growing room if they utilize a propane heat source. The drawback is the possibility of getting contaminated propane, but increasing the CO2 levels can help plants go wild with new growth.
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