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Broad-leaved Bristle Grass
Setaria megaphylla
SA tree number
English: Broad-leaved Bristle Grass, Giant Setaria, Natal Grass
Afrikaans: Breëblaarborselgras, Reusesetaria
Zulu: umPungampunga, umPhunga-phunga
Historical scientific names: Panicum megaphyllum
Setaria megaphylla, commonly known as Broad-leaved Bristle Grass or Breëblaarborselgras, is a striking indigenous perennial grass. It is easily recognised by its very large, broad, ribbed leaves, which can reach impressive lengths, and its tall, upright, bristly flower spikes. This handsome grass forms dense clumps and is a wonderful choice for adding texture and naturalistic appeal to gardens, particularly in semi-shaded to sunny areas.
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Distinguishing features:
Very broad, large leaves (up to 1 metre long and 10 cm wide) with prominent parallel veins, often arranged in two ranks.
Forms large, dense clumps (tussocks).
Tall, upright, dense, cylindrical flower spikes (panicles) that are bristly due to numerous fine bristles associated with the spikelets.
Spikes are typically greenish-purple or yellowish.
Grows in shaded to semi-shaded, moist areas, often in forest margins.
Overall appearance:
The Broad-leaved Bristle Grass (Setaria megaphylla) is an impressive indigenous perennial grass that forms large, lush clumps. It stands out with its exceptionally wide, dark green leaves, which can grow very long and have a ribbed texture. From late summer into autumn, it produces tall, upright, bristly flower spikes that add a unique, somewhat shaggy texture to the plant, making it an excellent choice for adding natural elegance to a garden.
Height:
Typically grows 1.5 to 2.5 metres tall when in flower, with foliage reaching about 1 metre.
Width:
Forms large, dense clumps (tussocks) that can spread 1 to 1.5 metres wide.
Leaves:
The leaves are its most prominent feature: very large and broad, typically 30-100 cm long and 3-10 cm wide, giving the appearance of a leafy plant rather than a typical grass. They are linear to lanceolate, tapering to a point, with prominent parallel veins (ribbed texture). The colour is usually a deep, glossy green. They are often arranged in two ranks (distichous) along the stem. The leaf sheaths are distinct, enclosing the stem.
Flowers:
The flowers are tiny and contained within spikelets, which are densely packed into a large, cylindrical, upright panicle (the flower spike). The spikes are typically 15-40 cm long and have a characteristic bristly appearance due to numerous long, stiff bristles (setae) that protrude from beneath each spikelet. The colour of the spikes can range from greenish-yellow to purplish or brownish. Setaria megaphylla flowers are hermaphroditic (perfect flowers).
Flowering season:
Flowers mainly in late summer to autumn (around February to May).
Fruits:
The fruits are small, oval, shiny seeds (caryopses), enclosed within the persistent glumes and bristles of the spikelet.
Seeds:
Small, shiny, dark brown to black, oval seeds. They are numerous and dispersed when the spikelets break off.
Stems:
The culms (stems) are robust, erect, and relatively thick. They are leafy, especially towards the base, and grow in dense clumps.
Roots:
Produces a strong, fibrous root system that helps anchor the large clumps and access moisture.
Soil type:
Prefers moist, well-drained, fertile soils rich in organic matter. It tolerates a range of soil types from sandy to loamy, but performs best with consistent moisture.
Aspect:
Thrives in partial shade to full shade, especially in hotter regions, but can tolerate full sun if the soil remains consistently moist. It prefers sheltered locations. It is sensitive to severe frost, which will cause the foliage to die back, but it generally regrows vigorously from the base in spring if the roots are protected.
Ediblity:
Not typically considered edible for humans. While some Setaria species produce edible grains, Setaria megaphylla is not cultivated for food.
Toxicity:
Generally considered non-toxic.
Uses:
Highly valued as an ornamental grass for adding a lush, tropical, or architectural element to gardens.
Excellent for planting in large borders, mass plantings, or as a focal point in shaded areas.
Useful for naturalising in woodland gardens or along stream banks.
Its large leaves can provide a soft, green backdrop for other plants.
Can be used for erosion control on slopes where its fibrous roots stabilise the soil.
Ecology:
The dense clumps provide shelter and nesting sites for small birds and insects. The seeds, though small, can be a food source for some granivorous birds. The plant’s overall robust growth contributes to the biomass and soil health of its natural habitat. It forms an important part of the undergrowth in forest and woodland ecosystems.
Distribution and habitat:
Setaria megaphylla is indigenous to South Africa and is widely distributed in the eastern and north-eastern parts of the country. It is found in the Eastern Cape, KwaZulu-Natal, Mpumalanga, Limpopo, and North West provinces, extending into Swaziland, Zimbabwe, and Mozambique. It typically grows in moist, shaded to semi-shaded areas, such as forest margins, clearings in woodlands, along river banks, and in damp grassland.
Derivation of name:
The genus name Setaria comes from the Latin word 'seta', meaning 'bristle' or 'bristle-like hair', referring to the characteristic bristles found on the flower spikes of these grasses.
The species epithet megaphylla is derived from the Greek words 'mega' (large) and 'phyllon' (leaf), literally meaning 'large-leaved', which perfectly describes its most distinctive feature.
The common name "Broad-leaved Bristle Grass" similarly highlights its broad leaves and the bristly nature of its inflorescence.
Historical aspects:
As a robust and widespread indigenous grass, Setaria megaphylla has long been a natural component of the Southern African landscape. While not typically cultivated for food or direct human use, its ecological role and visual appeal have made it a candidate for inclusion in indigenous gardens, especially as interest in water-wise and ecologically appropriate landscaping grows.
Interesting facts:
This grass is a giant! Its leaves are so big and wide that you might think it's a completely different kind of plant, not a grass at all.
The flower spikes are super bristly, almost like little green bottle brushes sticking up from the plant.
It loves living on the edge – specifically, the edge of forests and woodlands, where it gets just the right amount of sun and shade.
Even though it's a grass, it brings a really lush, tropical vibe to a garden, making it look much wilder and more exotic.
Growing tips:
Propagation: Easily propagated from seed or by division of established clumps, especially in spring.
Light: Prefers partial shade to full shade. Can tolerate full sun if soil remains consistently moist.
Watering: Requires consistently moist soil. Water regularly, especially during dry periods.
Soil: Plant in well-drained, humus-rich, fertile soil.
Container: Can be grown in very large containers, but its size is best suited for planting in the ground.
Maintenance: Generally low maintenance. Can be cut back in late winter/early spring to encourage fresh new growth. Protect from severe frost.
This plant is a fantastic alternative for:
Common name
Scientific Name
Plant type:
Plant type
Plant family:
Poaceae (Greek plant name) - Order: Poales