Answer: Your Tropicanna's will still need to be cut down, even if your area does not receive a hard winter frost. The best indication that they have stopped growing is when the temperatures begin to drop and their leaves begin to die. At this time, cut back the foliage to prepare the plant for a winter rest.
You can fertilize after growth begins in the spring with a slow release 15-15-15 or 20-20-20.
Glad you like our website!
Q&A Library Searching Tips