Acacia cultriformis

Knife Leaf Acacia

General Info

This tree is known for its large, heart-shaped leaves that provide abundant shade. It produces striking white flowers with purple and yellow markings, appearing in showy clusters during late spring. Long, slender seed pods dangle from its branches, adding visual interest even after the flowers have faded. The bark is grayish-brown and becomes deeply ridged with age, giving the tree a rugged appearance. Its fast growth and tolerance for various soil types make it a versatile choice for urban landscapes.

Native Range: Eastern Australia

Horticultural use: Screen or Hedged

Tree Shape: Rounded or Vase
Foliage Type: Evergreen
Maximum Tree Height: 20 feet
Canopy Width: 10-15feet
Growth Rate: ~24-36in/year
Leaf Arrangement and Form: Alternate and Simple
Leaf Shape: Sickle-shaped
Leaf Color: Bluish Green, Silver or Gray Green
Fall Color: No
Flowers: Showy, Fragrant
Flower Color: Yellow
Flower Time: Spring
Fruit Size and Color: Large Brown Legume
Fruiting Time: Fall, Winter or Summer
Bark Color: Dark Brown or Light Green
Bark Texture: Furrowed and Smooth
Litter Type: Dry Fruit

Recommended Planting Area: 2′ to 4′
Water Use Rating: Low
Sunset Climate Zone: 13 – 24
Soil Texture: Loam, Sand or Clay
Soil pH: Slightly Acidic to Slightly Alkaline
Salt Tolerance: Moderate
Schoolyard Trees: No
Shade Tolerance: No

Branch Strength: Weak
Root Damage Potential: Low
Potential health issues: Allergy
Wildlife Interactions: and Attracts Birds
Disease and Pest Susceptibility: Root Rot and Invasive Shot Hole Borer
Disease and Pest Resistance: Armillaria and Root Rot
Utility Friendly: No