The problems with container plant roots. when purchasing a container plant be sure to check the root system. Wholesale plant sellers tend to leave the plants in small pots for to long. This can lead to problems with the root system. What you have to look for is to make sure the roots are not coming back up and around the base of the plant thereby choking it. When you are replanting be sure to make the hole in the ground 1and 1/2 to 2 times up to 5 times the size of the root ball. This is how big you will have to dig to ensure proper growth.