White Ironbark (Leucoxylon)

The White Ironbark (Leucoxylon) has dark green foliage and inconspicuous red flowers, with an abuncance of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the winter, with fruit and seed production starting in the winter and continuing until fall. Leaves are retained year to year. The White Ironbark (Leucoxylon) has a long life span relative to most other plant species and a rapid growth rate. At maturity, the typical White Ironbark (Leucoxylon) will reach up to 50 feet high, with a maximum height at 20 years of 30 feet.

The White Ironbark (Leucoxylon) is usually not commercially available except under contract. It can be propagated by bare root, container, seed. It has a slow ability to spread through seed production and the seedlings have high vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 22°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Rapid
Growth Period Spring, Summer, Fall
Lifespan Long
Plant Nativity Cultivated, or not in the U.S.
Commercial Availability Contracting Only
Physical Characteristics
Bloom Period Winter
Displays Fall Colors No
Shape/Growth Form Single Stem
Drought Tolerance Medium
Shade Tolerance Intolerant
Height When Mature 50
Vegetative Spread None
Flower Color Red
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Winter Fall
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 22
Soil Depth for Roots 20
Toxic to Nearby Plants Yes
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing Yes
Growth Requirements
pH Range 6–8.5 pH
Precipitation Range 20–20 inches/yr
Planting Density 170–1200 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 20
Minimum Frost-Free Days 180 day(s)
Salinity Tolerance Medium
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention Yes
Palatability Low
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA