Make sure your plants are getting enough water . A lot of problems are the result of record-breaking heat and lack of rain . Check irrigation systems for broken heads and pipes. Remove water-blocking branches. Use risers to clear taller growing plants.
Most perennials give daily color and last longer.
I have found that the tall pentas and crossandra can survive at least six to seven years. This is one of the most reliable of the shrub bloomers with a good display of flowers every day of the year. It can grow to 8-10 feet in height but is a slow grower. The pinwheel jasmine does well in sun or shade but cannot tolerate high alkalinity. Do not plant this beauty within 5-6 feet of any cement including house foundations.