We have a potted (Roma) tomato plant which is coming along nicely. People told us to get a tomato cage, so I did and set it up. Do I then need to manage how the plant grows into and around the cage? Or do I just let it grow on its own once the cage is in place?
Watch the plant and train it if necessary. If the plant starts climbing the supports on its own you won't need to do anything. However, if your plant is stubborn you have a couple of options.
Basically you just need to see what your plant is doing. If you have horizontal supports on your cage(which it sounds like you probably do) then your plant may just behave and you may not have to do anything. However if your plant does not want to behave just gently train it to do what you want it to do.