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Silkoak (Robusta)

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Silkoak (Robusta)

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The Silkoak (Robusta) is generally described as a perennial tree. This is not native to the U.S. (United States) and has its most active growth period in the spring and summer and fall . The Silkoak (Robusta) has green foliage and inconspicuous yellow flowers, with a smattering of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the summer, with fruit and seed production starting in the fall and continuing until winter. Leaves are retained year to year. The Silkoak (Robusta) has a moderate life span relative to most other plant species and a rapid growth rate. At maturity, the typical Silkoak (Robusta) will reach up to 105 feet high, with a maximum height at 20 years of 100 feet.

The Silkoak (Robusta) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by bare root, container, seed. It has a rapid 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 17°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Rapid
General Type Tree
Growth Period Spring, Summer, Fall
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Introduced to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Summer
Displays Fall Colors No
Shape/Growth Form Single Stem
Drought Tolerance Medium
Shade Tolerance Intolerant
Height When Mature 105
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness Yes
Fruit/Seed Abundance Low
Fruit/Seed Seasonality Fall Winter
Seed Spread Rate Rapid
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required Yes
Minimum Temperature 17
Soil Depth for Roots 36
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing Yes
Growth Requirements
pH Range 5.3–7 pH
Precipitation Range 30–30 inches/yr
Planting Density 300–800 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 36
Minimum Frost-Free Days 365 day(s)
Salinity Tolerance None
CaCO3 Tolerance None
Sustainability & Use
Leaf Retention Yes
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

Plant Distribution
can be found in Florida, Hawaii, PR
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