Is Grevillea robusta a hardwood?
Timber: Grevillea yields a medium-weight hardwood with a density of 540-720 kg/cubic m at 15% moisture content. The timber has economic potential.
Is Grevillea robusta invasive?
Grevillea robusta is a tree that can reach 12 metres in height. Widely planted in warm temperate, subtropical or tropical regions for shade or agroforestry, Grevillea robusta has naturalised and become invasive in several countries (Hawaii, Australia, Mauritius, the Caribbean, Brazil and French Polynesia).
Where do I plant Grevillea robusta?
Once the tree is established, it can tolerate temperatures down to 18° degrees Fahrenheit (-8° C). However, the plants grow best and prefer warm temperate climates. The trees love full sun but can grow in semi-shade or light woodland environments.
How long does Grevillea robusta live?
The Silky Oak (Grevillea robusta) is a very popular native tree in Australian gardens and can grow to 20 metres and live for up to 100 years.
What is the common name for Grevillea robusta?
southern silky oak
Grevillea robusta, commonly known as the southern silky oak, silk oak or silky oak, silver oak or Australian silver oak, is a flowering plant in the family Proteaceae.
Is Grevillea robusta poisonous?
Australians have been warned to take care when coming into contact with the beloved silky oak tree – as experts reveal the plant is extremely poisonous. ‘Like other grevilleas the silky oak also contains tridecyl resorcinol, which causes an allergic reaction leading to contact dermatitis.
How do you prune Grevillea robusta?
General Grevillea Pruning rules.
- Always use a sharp clean pruning saw, loppers or secateurs.
- Prune dead wood away at any time.
- Remove broken or damaged wood at any time.
- Light tip pruning of new growth can be carried out in spring to late summer.
How do you propagate Grevillea robusta?
Take a cutting from a grevillea – it’s not a problem if it has a soft tip. The roots will form best from just below a node, so take the bottom leaves off. And then just scrape on both sides, to wound the tissue, and we’re ready to plant.
Is Grevillea robusta toxic?
It’s not all “lolly water”, though – the nectar in a silky oak could make you ill. “Like other grevilleas the silky oak also contains tridecyl resorcinol, which causes an allergic reaction leading to contact dermatitis. The chemical is similar to toxicodendron in poison ivy,” Dr Moore said.
Do Grevilleas like phosphorus?
Planting and care for your grevilleas They also generally don’t like heavy clay or compacted soils, so break these soil types up with a mattock. When you do, use a low phosphorus native plant fertiliser, because grevilleas are very well adapted to low phosphorus conditions.
Is Grevillea toxic to humans?
They’re poisonous if you eat them fresh from the branch. Some grevillea species can trigger itching, redness and rashes if children have an allergic reaction on contact. All parts, especially the leaves, are poisonous (the stems are safe when cooked).
What kind of leaves does Grevillea robusta have?
Leaves alternate, pinnately compound (“fern-like”), 15-30 cm long, the pinnae (leaflets) usually further bipinnate, lanceolate, margin involuted (rolled inward toward the upper surface), dark green above, silky pubescent below.
How big are the leaves of g.robusta?
G. robusta and G. hilliana have been used commercially for timber. Ovary with hairs. Ovary glabrous. Leaves EITHER entire and linear, 6–30 cm long, 1–2 mm wide, OR 2–10-partite with similarly long and narrow lobes; margins of leaves revolute, enclosing all or nearly all of the lower surface (except for the midvein).
Why are the leaves falling off my Grevillea tree?
And, its branches, flowers and leaves often fall off especially where there are winds. As a result, the tree is fairly messy. And, you’ll need to do some cleaning up every so often because of all the debris. That said, many gardeners believe the extra work is well worth having such a beautiful tree in their backyards.