Grevillea
Grevillea spp.
Ordinary fertilizer is what kills it — phosphorus is the poison here, and lean, free-draining acid soil the cure.
Spacing & sowing
- Plant spacing
- 6 ft 7 in
- In-row spacing
- 6 ft 7 in
- Between rows
- 8 ft 2 in
- Square-foot density
- Not suited to SFG
Growing
- Type
- Shrub · Perennial
- Botanical family
- Mixed / other
- Sunlight
- Full sun; it will take partial shade but flowers less for it.
- Watering
- Water weekly while it establishes, then leave it be — drought-tolerant once settled.
- Feeding
- A low-phosphorus native plant fertilizer, in spring only.
- Frost tolerant
- Yes
- Flowering
- March
- Pruning
- Tip-prune lightly after each flush of flower.
Through the year
- Mar–Mar Bud Break
- Mar–Dec Flowering
- Dec–Dec Dormancy
- Jan–Mar Dormancy
Companions
Lavender, Rosemary, Agapanthus, Westringia, Kangaroo Paw
Pests & problems
- Cabbage looper Grevillea looper caterpillar
- Scale insects Immobile brown or white bumps fixed to stems and leaf undersides, sucking sap and weakening growth. Wipe off with a damp cloth or dab with horticultural soap; watch for the sooty mold that follows.
- Phytophthora root and foot rot Phytophthora root rot, brought on by overwatering or waterlogged soil
- Phosphorus deficiency Phosphorus toxicity from standard fertilizers
Garden allies
Beneficial predators that hunt this plant's pests — grow their favourite flowers nearby to recruit them. companion plant
- Hoverfly SyrphidaeHunts Scale insects
Bee-mimicking flies whose legless larvae graze aphid colonies clean while the adults pollinate. A ribbon of shallow, nectar-rich flowers kept in bloom all season recruits wave after wave of them.
- Ladybird (lady beetle) CoccinellidaeHunts Scale insects
The gardener’s favorite ally: adults and their alligator-shaped larvae each eat thousands of aphids, plus scale, mealybugs, and other soft-bodied sap-suckers. Grow flat, open flowers for the adults and never spray a colony that ladybird larvae are already working.
- Parasitic wasps Braconidae & TrichogrammaHunts Cabbage looper
Tiny, stingless wasps that lay eggs in or on caterpillars, aphids, and moth eggs — the white cocoons riding a hornworm are their calling card, so leave that caterpillar be. Umbel flowers with shallow nectar keep the adults fuelled.
- Spined soldier bug Podisus maculiventrisHunts Cabbage looper
A predatory stink bug — same shield outline as the pest, but with a sharp spine at each shoulder and a beak it uses to spear caterpillars and beetle grubs. Learn the spines before you squash a shield bug, because this one is on your side.
The Cottage Garden Companion — the gardener's herbarium at cottagegardencompanion.com