What is the correct size pot?
I have a tall African Milk Tree (Euphorbia Trigona). I have had it for almost 3 years now, and it is in its original pot (see photo).
However, it grew 11.5 inches since I first got it. It is now 39''. The pot height is 5.5'' and 6'' across (at the top). The cactus is doing well. Should I leave it as is, or repot?
Oh, and if repot, then what size of pot is best? Should I aim for wide and shallow, or more narrow and deep?