They do have specific seasonal pruning and feeding needs.
Gung Hoe Garden Girls offers maintenance to our clients on an as needed basis.
In general, with the gardens that I design, there are two major cleanups: the fall and then again in spring after the rains have pushed robust new growth and plants need a bit of tidying up.
Mediterranean and California native plants do not need much in the way of fertilization, but we use only organic fertilizers when we do. Organic fertilizers work slowly and over time improve soil texture and its ability to hold onto water - a plus in our climate.