[header] How to use growing bags for plants [title] Purchase your growing bag. [step] You can purchase a growing bag at a nursery or home improvement store. You can choose a plastic or fabric growing bag, but fabric growing bags often need to be watered more than plastic bags. 
The roots will be as large as the plant, so choose the bag according to the size of the roots. Don't buy a very large bag unless you are going to plant something large.