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. It is hardy to about 15 to 20 degrees F.