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Banksia seminuda (River banksia)

Other names: Banksia littoralis var. seminuda

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Species
B. seminuda is a variable, upright, evergreen shrub or conical tree with whorls of leathery, broadly linear to narrowly elliptic, toothed, dark green leaves, white beneath, and cylindrical, yellow or red flower heads from early autumn into winter.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
20 m 10 m 10-20 years
65 ft 32 ft 10-20 years

Where to grow

Soil type
  • Loamy
  • Sandy
Soil drainage
  • Well-drained
  • Moist but well-drained
Soil pH
  • Acid
  • Neutral
Sunlight
  • Full Sun
Aspect
  • East
  • West
  • South
Exposure
  • Sheltered
  • Exposed

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Additional plant details

Cultivation

Grow outdoors in frost-free areas in well-drained or moist but well-drained, neutral to acid soil in sun. Drought tolerant once established. Tolerates light frost once established. Avoid waterlogged conditions. Best with no fertiliser, but if needed, use a low phosphorus formula. Under glass, grow in equal mix loam, grit & peat with ventilation in full light. In growth, water moderately & feed at half-strength monthly; sparingly in winter.

Suggested uses

Flower Arranging, Mediterranean, Drought Tolerant, Conservatory, Low Maintenance, Coastal, Bees (attract & feed bees), Wind-breaker, Hedging/Screens, City, Specimen tree

UK hardiness

H2

USDA zones

Zone 9, Zone 10, Zone 11

Sunset zone

15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1

WUCOLS

North-Central Coastal = Low
Central Valley = Inappropriate
South Coastal = Low
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Evergreen

Habit

Upright, Conical

Native to

Western Australia

Drought tolerant

Yes

Flood tolerant

No

Toxicity

Not toxic

Plant care

Pruning

Pruning group 1. If grown indoors, may need to pruning back to restrict size.

Propagation methods

Seed

Propagation

Sow seed at 18C (64F) in spring.

Pests

Slugs

Snails

Diseases

Phytophthora root diseases

Selective pruning only (only if needed)

Plant container grown plants in a sunny sheltered spot

Bring tender indoors if container grown (in cold areas)

Apply a fertiliser container grown plants regularly

Take semi-ripe cuttings

Sow seeds in containers with heat (spring)

Plant in moist, lime free, well-drained soil

Other plants

Plants in this Genus (0)

Banksia

Companion plants (0)

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