Practical
Plants

Acacia cultriformis

Knife-Leaf Wattle

a perennial woody evergreen member of the Acacia genus in the family Leguminosae.

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Taxonomy and growth

Genus
Acacia
Life cycle
perennial
Foliage
evergreen
Woodiness
woody
Height
4 m
Flower type
hermaphrodite

Uses

Edible uses

This section contains historical Plants For A Future notes marked noncommercial.

Flowers - cooked[4]. Rich in pollen, they are often used in fritters.

Plant part
Flowers

Material uses

This section contains historical Plants For A Future notes marked noncommercial.

A yellow dye is obtained from the flowers[5]. A green dye is obtained from the seed pods[5]. Plants are heavily armed with thorns and make a good screen or hedge in warm temperate areas[6].

Ecology and functions

Hedge

Nitrogen fixer

Environment

Range
Australia - New South Wales and Queensland.
Habitat
Rocky ridges[7]. Dry sclerophyll forests and heath[8].
Light
full sun
Shade tolerance
no shade
Water
moderate
Hardiness
Zone 8+
Soil textures
sandy, loamy, clay
Soil pH
acid, neutral, alkaline
Drainage
well drained
Tolerances
high wind, maritime exposure, drought
Wind
Yes
Maritime
Yes
Tolerates Nutritionally Poor Soil
No
Drought
tolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

Seed - best sown as soon as it is ripe in a sunny position in a warm greenhouse[1]. Stored seed should be scarified, pre-soaked for 12 hours in warm water and then sown in a warm greenhouse in March. The seed germinates in 3 - 4 weeks at 25°c[3]. As soon as the seedlings are large enough to handle, prick them out into individual pots and grow them on in a sunny position in the greenhouse for their first winter. Plant them out in late spring or early summer, after the last expected frosts, and consider giving them some protection from the cold for their first winter outdoors. Cuttings of half-ripe wood with a heel, July/August in individual pots in a frame[9]. Overwinter in a greenhouse for the first winter and plant out in their permanent positions in late spring or early summer. Fair percentage[9].

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

Prefers a well-drained sandy loam and a very sunny position[1]. Succeeds in dry soils and is drought tolerant. Succeeds in any good garden soil that is not excessively limey[2]. Most species become chlorotic on limey soils[6]. This species is probably very tender in Britain, but it has been grown outdoors in the mildest parts of Cornwall[2]. Closely related to A. pravissima[2]. This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[6].

References

  1. F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00

    ↩1↩2

  2. Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981-00-00

    ↩1↩2↩3

  3. Rice. G. (Editor) Growing from Seed. Volume 1. Thompson and Morgan. 1987-00-00

    ↩

  4. Cribb. A. B. and J. W. Wild Food in Australia. Fontana 1976-00-00 ISBN 0-00-634436-4

    ↩

  5. Grae. I. Nature's Colors - Dyes from Plants. MacMillan Publishing Co. New York. 1974-00-00 ISBN 0-02-544950-8

    ↩1↩2

  6. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2↩3

  7. Phillips. R. & Rix. M. Conservatory and Indoor Plants Volumes 1 & 2 Pan Books, London. 1998-00-00 ISBN 0-330-37376-5

    ↩

  8. Carolin. R. & Tindale. M. Flora of the Sydney Region Reed. Australia. 1993-00-00 ISBN 0730104001

    ↩

  9. Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948-00-00

    ↩1↩2

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