During this winter season, I was growing collard greens and swiss chard. Amazingly, you can keep cutting the leaves of these plants and eating them as they grow back. I was able to get about 5 harvests until spring came when the plants started to bolt.
Growlight
To grow during the winter, I installed a shoplight with fish aquarium and plant bulbs. I noticed that the leaves seem to grow sideways to catch the light as well as angle themselves toward the sun. The ballast of the shoplight had the added effect of providing a little heat to the small enclosure. It wasnt much but the small temperature variation helped.
Air Circulation
I also noticed that dew was building up on the walls and especially the leaves so utilized a small desk fan to blow on the leaves. Leaves need to stay dry so that they can perform their photosynthesis properly and reduce mold. Periodically, I would move the fan to point at which ever plant needed the most air or had the moistest leaves.
Controlling Humidity
After heavy rains, I would unzip the door and allow the greenhouse to air out during the day. Unfortunately, this attracted more bugs because of the light. Also at night, the bugs could be seen crawling to get in. Luckily, the winter chill killed most of the bugs in the month of january and february.
Temperature Control
As I stated before, the ballast in the shoplight provides some heat to the greenhouse. And of course, the sun provided heat, too. It does help that I am in the south. Here in Georgia, temperature is relatively mild as compared to the northern states. (Most Georgians say its cold out when they cant wear their flip-flops and shorts.) Temperature in the greenhouse has been mild even though the outside temps have fluctuated a fair range from 70-80s to below freezing. I have had only two or three nights that the temp inside the greenhouse was below freezing and icicles formed on the drip lines. Fortunately, the ice melted each day and the plants were resilient enough to keep growing.
Algae
The main line I am using for the pump is a 3/4 inch clear hose which allows me to monitor algae build up inside. To flush out the algae, I remove the stopper on the end of the hose. The pressure from the pump is capable of flushing out the algae back into the gutter. I only do this flush when all the drip lines are clogged and no adjusting to the drip lines help.
When I first started the zipgrow towers, I used worms that I purchased from the store to clean out the algae. It took about a month, but worked great. All I had to do was open the tub of worms and place the tub upside down on the tower. Over the course of the week, the worms shimmied through the line and into the irrigation. The worms and worm eggs then spread through the system. Eventually, the algae was eaten up and the lines were clear. But during the winter, worms remain dormant, so this option is unavailable.
Pests
Periodically, I would inspect the plants and take the appropriate action based on the insects encountered. Snails and slugs were the worst. Aphids were common. Centipedes. Flying insects. I will detail their control measures at another time.
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