SelecTree: Tree Detail

Photo Locations: UC Davis Arboretum - Davis, CA, UC Berkeley Botanic Gardens, Cal Poly Campus - San Luis Obispo, CA, San Marcos Growers - Santa Barbara, CA and Santa Barbara Botanic Garden - Santa Barbara, CA

General Notes

Needs good drainage. Attractive in groves. The species floribundus is lobed and does not have leaflets.

Native to California.

A Lyonothamnus floribundus subsp. asplenifolius in Woodside is registered as a California Big Tree. It measures 45 feet high, with a trunk circumference of 61 inches and a crown spread of 40 feet.

Family: Rosaceae

Additional Common Names

CATALINA IRONWOOD, SANTA CRUZ IRONWOOD, FERN-LEAF IRONWOOD, ISLAND IRONWOOD

Tree Characteristics

Conical or Oval Shape.

Has Evergreen foliage.

Height: 50 - 60 feet.

Width: 40 feet.

Growth Rate: 24 Inches per Year.

Longevity 50 to 150 years.

Leaves Pinnatifid, Dark Green, No Change, Evergreen.

Flowers Showy. White. Flowers in Summer. Has perfect flowers (male and female parts in each flower).

Brown Capsule, Small (0.25 - 0.50 inches), fruiting in Fall.

Bark Striking, Light Gray or Red Brown, Exfoliating, Smooth or Striated.

Shading Capacity Rated as Moderate to Dense in Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 14 - 17 and 19 - 24.

USDA Hardiness Zones 8 - 10.

Exposure Full Sun to Partial Shade.

Moist to Dry Soil.

Drought tolerant.

Loam or Sand Texture.

Highly Acidic to Slightly Alkaline Soil pH.

Salinity Tolerance is Moderate on Coast.

Seaside Tolerance is Good in Moderate Zone.

Pests & Disease Information

Susceptible to Aphids.

Health, Safety & Environmental Concerns

Branch Strength Rated as Strong.

Root Damage Potential Rated as Moderate.

None Known Health Hazard.

Biogenic Emissions considered Low.

Attracts Birds.

Special Uses & Values

Screen.

Cite this tree:
SelecTree. "Lyonothamnus floribundus subsp. asplenifolius Tree Record." 1995-2019. Feb 23, 2019.
< https://selectree.calpoly.edu/tree-detail/lyonothamnus-floribundus-asplenifolius >

SelecTree Nursery Connection Map
Cal Poly / ESRI