Nothing beats Lantana in SoCal for constant blooms. There are basically two kinds; L. sellowiana which is the trailing type- grows in a pile and comes in purple, yellow or white and L. camara which grows upright to 6 feet and comes in bright or pastel multicolors. Pictured is L. camara 'Radiation'. It's is always in bloom and the hummingbirds love it. Easy to find in nurseries.