I have a Gardenia plant that is over 25 years old. I keep it indoors before the first frost and until mid-May and then move it outdoors on a covered porch facing east. My question is, since I cannot put it into a large pot, I was told to trim it back 1/3 before bringing it in this year.
Is this your suggestion? It is presently (in the large pot) about 5 1/2 feet high. When is the best time to trim it and how much?