Island alum root is the largest California native species among the coral bells, mounding to 12-18 in. high and 24 in. across. This species has large evergreen leaves, often to 5 in. wide, and produces white with pink flowers on 30 in. stalks.
The Island alum root is native to coastal islands of California and has been a popular garden plant for many years throughout the Inland Empire. Easy to grow, it is an excellent understory choice in shady areas along walkways, in mass plantings, pots and patio planters. It grows best in loamy soils and with regular moisture; it can endure short periods of moisture stress during summer.