Knife Acacia Tree. Acacia cultriformis Fabaceae Family ( Pea ) Knife Acacia. Also Called: Knife Leaf Wattle. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. A drought resistant bushy shrub or tree to 16 feet tall, 16 feet spread. One inch long grey-green triangular leaves (knife Like), tightly hug the drooping grey branches. It has fragrant bright yellow rounded flowers forming in clusters in the spring. Requires good drainage. Plant in full sun to light shade. It is frost resistant. Acacia cultriformis Initially has, bipinnately compound leaves with 12�24 pairs of leaflets growing on the koa plant, much like other members of the pea family. At about 6�9 months of age, however, thick sickle-shaped "leaves" that are not compound begin to grow. These are called phyllodes, blades that develop as an expansion of the leaf petiole. The vertically flattened orientation of the phyllodes allows sunlight to pass to lower levels of the tree. The true leaves are entirely replaced by 7�25 cm (2.8�9.8 in) long, 0.5�2.5 cm (0.20�0.98 in) wide phyllodes on an adult tree Quick Notes: Height: Up to 16 feet tall, & up to 16 feet spread. Trunk: 3 to 8 inches in diameter. Bark: Grayish-brown, thin, smooth or scaly. Flowers: Yellow - gold; very fragrant;simple, 1/4 inch round, on terminal portions of plant. Blooming Time: Mid February - March or April. Seed Pod: Seedpods 1 1/2 - 3" long, 3/8 - 1/2" in diameter; a cylindrical pod; short-pointed at ends, dark brown or black, hard; maturing in summer, remaining attached, often opening late; many elliptical flattened shiny brown; seeds. Leaves: Thick, knife - Like; about 3 - 10 inch long, grayish green; coarse and leathery. Called phyllodes. Stems/Trunks: A redish-brown, finely furrowed bark. 3 to 14 inches in diameter. Found: Introduced from Australia (New South Wales, Queensland). At 974 feet elevation. Elevation: 0 to 4,000 feet. Hardiness: USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) Sun Exposure: Full Sun Habitat: Sandy well drained desert soils. Low water use landscaping plant in the Phoenix and Tucson areas. Miscellaneous: Flowering Photos Taken February 21, 2008; Glendale, Arizona.

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