Erigeron karvinskianus (Santa Barbara Daisy) - this is a trailing groundcover that is beautiful cascading over walls or pots. It spreads 3-5 feet wide and grows 1-2 feet tall. The small white daisies with a touch of pink bloom almost year-round. It looks its best in a cool spot with sun to light shade. It can be invasive with moderate water, but it will take poor soil and drought and performs best if cut down periodically. Cold hardy to about 15 to 20 degrees F. Flowers are a great treat for bees and tiny beneficial flies and wasps. It prefers a coastal climate and the interior heat of summer does make it shut down. But, as soon as the weather is a cool again in fall, it perks right up and blooms until hard frost.