Asparagus setaceus

Description

Asparagus setaceus is a scrambling evergreen perennial with tough green stems and leaves, which may reach several metres in length. The leaves are actually leaf-like cladodes up to 7 mm long by 0.1 mm in diameter, which arise in clumps of up to 15 from the stem, making a fine, soft green fern-like foliage. Sharp barbed thorns occur on the stem. Occurring from spring to autumn, the small greenish-white bell-shaped flowers are 0.4 cm long, and are followed by small green berries, which blacken with maturity. They are reportedly toxic upon consumption. If eaten, they can lead to diarrhea and abdominal pain.

Distribution

Asparagus setaceus is native to Southern Africa, extending south west as far as Calitzdorp in the Karoo.

It is grown elsewhere as an ornamental plant and has become an invasive species in several locations where it has been introduced.

Cultivation

Asparagus setaceus is cultivated as an ornamental plant, for planting in garden and containers, and as a house plant. The attractive foliage is also used in floral arrangements. It is hardy to 1 °C (34 °F), but does not tolerate being frozen. Therefore in temperate zones it is normally cultivated indoors in bright, indirect light.

This plant has gained the Royal Horticultural Society's Award of Garden Merit.

Invasive species

In Australia it is considered an invasive species and its hardiness has helped it become a weed in Lord Howe and Norfolk Islands. Other areas that regard it as an invasive species and noxious weed include the North Coast of New South Wales, and Queensland.

Toxicity

Asparagus setaceus is toxic to many domestic animals, including dogs and cats, and if they ingest the berries, vomiting, diarrhea, abdominal pain and allergic dermatitis may result. The toxic agent within the plant is sapogenin, a naturally occurring steroid.