YOU FINALLY HAVE YOUR OWN GREENHOUSE and it’s up and operational. The next decision, if you have not already determined this, is what to grow in your new greenhouse. The answer depends upon your purpose for having the greenhouse as well as some other factors. If part of your purpose for getting a greenhouse is to provide at least some of your own food, you will need to start by allocating space for those types of plants. Growers quickly find that their greenhouse is smaller than they realized once plants are in and growing.