Had to share this post from Pinterest because it works! I started this past July and August planting Cabbage/Collard seed in pots. As they grow you can transplant them to bigger pots in your greenhouse.
I am so glad I did this because we had a huge rain storm and the ones I planted in the garden didn’t make it. So I have back up plants in the greenhouse. I have also planted beans, peppers, and tomato’s in pots. I will post pictures of them this weekend. This just really works you must try! Just keep them fertilized and they will grow in pots!
(http://pin.it/11NA7ya) here is website!