Here's a list of some plants that will grow in Zone 11.

Acidanthera
Garland Larkspur (Delphinium x belladonna)
Heavenly Bamboo (Nandina domestica)
Large Flowering 'Apple Blossom' Amaryllis (Hippeastrum 'AppleBlossom')
'Thumbelina' Zinnia (Zinnia elegans 'Thumbelina')
Bird of Paradise (Strelitzia reginae)
Chinese Lantern (Physalis alkekengi)
Lady Fern (Athyrium filix-femina)
Lenten Rose (Helleborus orientalis)