[header] How to support tomato plants in pots [title] Know how large your plant is likely to grow. [step] When picking a type of tomato, do some research to figure out roughly how big the plant will get. You can look at its label, talk to a plant store employee, or do research online. 
[substeps] There are 2 types of tomato plants that are typically very different in size: determinate or indeterminate. Determinate plants only grow to about 3 feet (0.91 m) tall.