Pronounciation: A-KAY-sha a-NUR-a
Sunset 8, 9, 12-24
Landscape Use: For xeric landscape design themes only use mulga as a single or group of multiple-trunk small trees for creating an grey arid effect, it's a great residential or commercial small desert tree. Also, it can be used as a large background, screen, informal hedge plant, or even successfully as a parking lot tree.
Form & Character: Upright and VERY STIFF, rigid to spreading with age, large shrub to small tree, grey, dry.
Growth Habit: Evergreen, woody perennial tree, stiffly branched, slow growth rate to 20 to 30 feet with somewhat less than equal spread, wood is brittle.
Foliage/texture: Small, narrow, glaucous grayish blue-green phyllodes, narrow, linear to lanceolate less than than 3 inches in length, new phyllodes are bronzy brown in color; medium fine texture.
Flowers & fruits: Mulga flowers are rod shaped with prominent yellow stamens. Fruit in spring are a small flattened pod, green when immature ripening to brown, generally nondescript.
Seasonal color: Mulga flowers episodically during the warm season, mostly heavily during fall.
Temperature: Heat loving, cold tolerant to 15oF.
Light: Full sun
Soil: Mulga is tolerant of alkaline soils, although the phyllodes sometimes turn yellow in Phoenix in soils of high alkalinity. Chelated micronutrient fertilizers will correct this problem quickly if properly applied, but are rarely required.
Watering: Mulga needs little additional water from irrigation after establishment. It certainly requires no supplemental water during the winter months and only every one to two weeks during the summer to sustain its great performance in Phoenix. More frequent irrigations will dramatically increase its growth rate (producing an open and rank crown architecture) and eventual larger size.
Pruning: Very little needed except to give shape and to raise the crown in situations where a small upright tree form is desired.
Propagation: Fresh, ripened seed will germinate readily after acid or mechanical scarification. Semi-hardwood cuttings can be rooted successful during the summer months only.
Disease and pests: None
Additional comments: This is a tough (a la the pirate "Arrrrrrrr") large background shrub or small tree for xeric landscapes and/or restricted urban spaces because of its drought and heat stress tolerance.