Here in zone 9b in south Louisiana they are green year around but the leaves get shabby & many lower leaves are yellow so mid February I cut them back to about 3" , apply Bayer 3 in 1 granules at base & a little epsom salt. By the time early bloomers flower, April 1st, I have a nice 10" to 12" lush green plant. About July 1st I trim most back again because of rust that is a problem in our humid climate, apply Bayer 3 in 1 again & this keeps them the rest of the year. I follow this same routine with my rebloomers & have not seen any issue with blooms & actually find the rejuvenation produces more blooms longer.
