Posted: 19/05/2015 at 22:31
A growing point is the top of the plant or top of a side shoot. What I really mean is to say is always leave at least one side shoot growing just in case the top of the plant stops growing and turns into a flowering truss instead. Even cordons should have two growing points for the best crop.
Hopefully you will be able to tell before long once the first fruit ripens - easy if the varieties are very different in size or colour.
Don't start feeding them until the first flowers have set and tiny tomatoes appear.