The genus, Sophora is a member of the distinctive 'pea' family (Fabaceae), a group of plants that provides us with some of our most attractive garden subjects. It consists of more than 50 species, which are found in subtropical and temperate regions of the world. New Zealand has eight species of Sophora, collectively referred to by their Maori name, kowhai. Interestingly, the name Sophora is derived from the Arabic word (Sophero) to describe a tree bearing the distinctive flowers that are characteristic of the 'pea' family.

Sophora prostrata
Prostrate kowhai

This small-growing species is distinct amongst the New Zealand members of Sophora, in that it maintains the divaricate growth form throughout its entire life. It has not traditionally been as popular for garden use as other kowhai species, due to its unusual growth form and comparatively small flowers. However, it has become increasingly appreciated in recent years for its resilience, sculptural form and attractive colouration (especially on its orangish branches). The stiff habit of this shrub lends it well to either establishing structure within plantings (whether assuming its natural form or used as informal hedging), or even for use as a bonsai specimen.

Sophora prostrata is native to the dry eastern side of the Southern Alps, from Marlborough to southern Canterbury. Accordingly, it is well adapted to many of the conditions that are prevalent within urban environments; such as high winds, extreme light levels and frequent drought. The form of individual plants is determined by the degree of exposure to the elements and soil environment, demonstrating a wide range of sizes and forms (from low hummocks to large shrubs). Despite its exclusively southern distribution, S. prostrata is amenable to cultivation in most parts of the country (even in the humid north), and is a versatile landscape plant. The flowers of S. prostrata are unusual in both colour (often attaining quite orange hues, in contrast to the more typical yellows of other kowhai species) and in the manner in which flowers are borne upon the plants (they are often held in an 'upside-down' position, when compared with other kowhai species).