Certified GKH Gardening Expert
I see you are in zone 10 which can get down to 30 in the winter. That may take a toll on them each year. You might try cutting them back by about half and see if they invigorate. Also, be sure to keep the soil moist and fertilize monthly with a low nitrogen plant food. If they don't bounce back, go ahead and replace them. They look like New Guinea impatiens, so I am including an article about their care.