Acacia cultriformis (Knife Acacia)

Acacia cultriformis (Knife Acacia) is a small, multi-stemmed, evergreen tree of rounded to vase-shaped habit adorned with silvery-gray leaves shaped like paring knife blades. The foliage remains lovely all year round. In spring, masses of scented, fluffy, yellow flowers cover the branches and create a striking floral display. Relatively long-lived (50 years), Knife Acacia makes a dramatic focal point.

Acacia cultriformis (Knife Acacia) is a small, multi-stemmed, evergreen tree of rounded to vase-shaped habit adorned with silvery-gray leaves shaped like paring knife blades. The foliage remains lovely all year round. In spring, masses of scented, fluffy, yellow flowers cover the branches and create a striking floral display. Relatively long-lived (50 years), Knife Acacia makes a dramatic focal point. It is useful as a barrier or screen and is also perfect for banks and slopes. Its cut branches are attractive in flower arrangements.

  • Grows up to 10-20 ft. tall (300-600 cm) and 10-15 ft. wide (300-450 cm). Adds 24-36 in. per year (60-90 cm).
  • Performs best in full sun or light shade in dry to moist, well-drained soils. Drought tolerant once established.
  • Susceptible to shot hole borer, root rot. Deer resistant.
  • Native to eastern Australia.

Requirements

Hardiness 9
– 10

Climate Zones 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Trees
Plant Family Acacia
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)Summer (Early,Mid,Late)FallWinter
Height 10'
– 20'
(3m
– 6m)
Spread 10'
– 15'
(3m
– 4.5m)
Water Needs Low, Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Fragrant, Showy, Evergreen
Native Plants Australia
Tolerance Deer, Drought
Attracts Birds
Garden Uses Beds and Borders, Hedges and Screens
Garden Styles Coastal Garden, Mediterranean Garden