I've got some tomato plants that I thought were in big enough pots, but they seem to have outgrown them and I want to ensure proper growing conditions. They're in 5-8 gallon pots, not sure of the exact size.

I want to put them into bigger pots, but a couple of them already have tomato cages in. I had to do a lot of reaching stems around it to get the cages in, was worried that it might hurt the plant but seemed to do fine.

Also, I've found out that the soil I've been using is not ideal. When/if transplanting, would it be a good idea to shake some of the soil off the roots before transplanting?

Sorry if any of my questions have been answered already, I've been reading the forum everyday since starting this project, it's my first year gardening.

Zac