Silk Oak
- Common name(s): Silky Oak, Australian Silver Oak, Southern Silky Oak, Silver Oak
- Scientific Name: Grevillea robusta
- Family: PROTEACEAE
- Origin: Eastern coastal Australia
- Description: Tall tree up to 50 feet and a 30 foot plus spread. Thick trunk with heavy branches. The trunk is unusual with the crisscross of deep furrows. Leaves up to 6 – 13 inches long with multiple leaflets creating feather like appearance. Leaves are thick, dark green above and silver-gray below. Flowers are clusters of yellow-orange with fruit in small round, depressed seed pod.
- Environment: Grows best in full sun with a lot of area to grow. Do not put near buildings. Once established it is drought tolerant. Soil varies from sand, clay and loam, some moisture and well drained. It seems to be tolerant of frost down to 17°F. It may be affected by caterpillars or root rot. Attracts variety of wildlife form bees, insects, butterflies and hummingbirds.
- Additional Information: Despite its common names, it is unrelated to true oaks, which belong to the family Fagaceae. This tree is considered an environmental weed in New South Wales and plant invasive of concern. It has currently naturalized in Lord Howe Island. In Florida, IFAS (Institute of Florida Agriculture Services) has been monitoring the level of spread of the Silk Oak for North, Central and South Florida.
- Location: B
- Donated by Leu Botanical Gardens and planted in 2021