
This is my greenhouse. My husband and I built it, following some plans he found on the net. It has a dirt floor covered with two layers of heavy black plastic to discourage weed growth. It has a people door in one end and an exhaust fan on the other. We built ‘tables’ all the way around with room under them for storage, plus one corner for taller things, like a trash can full of Mel’s Mix.

I think most people who build greenhouses are concerned about warmth. We live in Arkansas and the big concern here is trying to keep our plants from burning up inside! I manage as well as I can with the exhaust fan which comes on automatically when the temperature gets too high in there. I also prop the door open on the opposite end. In order to run the exhaust fan or turn on a light, I string about 300 feet of outdoor heavy-duty extension cord from the house to the greenhouse. We don’t have heat or air conditioning, so the main thing I’m trying to do is extend the growing season.
My plan is to start seeds for cool crops, such as lettuce, spinach, broccoli, cauliflower, etc. around March 1st or so, with the hope that when it’s the proper time to plant them outside in my raised bed, square foot garden, I’ll have healthy plants to transfer. I’m really new at this, so everything is an experiment, and I’m reading everything I can get my hands on trying to figure out how to do things.

Our Garden –
We started out with a square foot garden on the ground. We live on top of a ridge line and had to truck in the soil to make a small space around the house for a ‘yard’ when we built over 30 years ago. The square foot garden allows you to build a garden plot on top of your existing soil using Mel’s Mix to bypass any soil problems. (Mel’s Mix is a combination of peat moss, vermiculite, and as many different kinds of compost as you can find. We use mushroom, barnyard, cotton burr, and some made by us.)
As I avoid getting down on my hands and knees – and up again – as much as possible, my husband and I decided to build a raised bed square foot garden. I now have 6 ‘boxes’ (4’x4’x12″) that are about at my chest level with a fence around it. I can add more Mel’s Mix, plant, weed, and harvest standing up! I mark the squares with stretched string and plant according to Mel’s suggestions. (Square Foot Gardening by Mel Bartholomew). We’ve had better luck with our veggie garden than ever before. We converted two brick planters close to the house to be square foot planters, too, and plant our tomatoes in those.
Each season I’m learning more and more about what I’m trying to do. So far, it’s mostly learning what NOT to do again, but I AM making progress. We were able to enjoy several different kinds of lettuce, spinach, a bit of broccoli and cauliflower, radishes, some celery, squash, and more during the spring. We were able to keep things alive during the summer, fall, and even a bit into the winter.

I started some lettuce plants in the greenhouse this fall because we had a cold snap super early. They did well, but then the greenhouse was getting too cold, so I transferred the plants into my dining area. I was able to harvest lettuce almost all the way through December.
Now all is in hiatus because of the weather. I’m using the time, reading and scheming on how I’ll start the next season.