Archontophoenix alexandrae

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Plant
ID 418 Archontophoenix alexandrae
Botanic Name Archontophoenix alexandrae
Common Name Alexandra Palm, King Palm
Family Name Arecaceae
Cultivars
Origin Australia, North Eastern Coast, Zone 10-12
Growth Type Palm / Cycad
Bark Type Leaf scars or bases
Foliage Type Evergreen Water Use Medium
No. of Species 2
Growth Habit Standard Growth Rate Medium
Height 18 - 28 m (60 - 93 ft) Spread 6 m (20 ft)
Plant Overview
This solitary feather palm has a slender greyish trunk that is strongly swollen at base and a spreading crown of graceful dark green fronds. It has a smooth green crown shaft and the creamy white flowers appear in a pendant cluster during summer.
Leaf
Type Compound Additional Information
Shape Imparipinnate
The imparipinnate fronds are composed of many lanceolate leaflets up to 300 mm(1 ft) long and are pale to dark green with whitish undersides (scales). The petiole in short and commonly twisted and the smooth green crown shaft is up to 1 m (3 ft) long
Arrangement Spiral
Margin Entire
Colour Dark green
Size 2000 - 3500 mm ( 78.7 - 137.8 in )
Flower
Perfume Odorless Additional Information
Shape Cyathiform
The semi pendant branched inflorescence appears under the crown shaft and is enclosed in large bracts up to 450 mm (18 in) long that fall away as flowering commences. The 2 male and 1 female flowers are arranged spirally on the branchlets.
Inflorescence Panicle
Colour Creamy white
Size 400 - 800 mm ( 15.7 - 31.5 in )
Flowering in
(Southern Hemisphere)
Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec
Fruit
Type Berry Additional Information
Colour Red
The pink-red ellipsoid drupe is up to 15 mm (2/3 in) long by 11 mm (3/8 in) wide and has a thin fleshy mesocarp that has interlocking fibers. The seeds are globular and the endosperm is ruminate.
Edible No
Bird Attractive Yes
Size 8 - 15 mm ( 0.3 - 0.6 in )
Fruiting in
(Southern Hemisphere)
Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec
Environment & Cultivation
Natural Soil Well drained, organic rich-poor moist sandy to clay loam, pH 6.0-7.5
Container Large pots, tubs, planter boxes, under glass in cold regions
Climate Tropical
Aspect Semi-shade to full sun, protected humid position, frost and drought tender
Pest & Diseases Orange palm dart, white palm scale, palm leaf blight, cottonycushion scale
Fertiliser Fertilise during growing period and add organic matter to the soil and keep moist
Pruning Remove spent fronds, prunning is not normally necessary
Cultural Uses Propagation
The Alexandra Palm is grown for its stately habit and is planted in tropical gardens or along water courses singularly or in groups. It is suitable for coastal and low-mountain regions, establishing in 3 to 5 years.
Sow fresh seed which will germinate in 6 to 12 weeks if keep warm and moist Seedlings are fast growing and require a deep container.
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