Pennisetum divisum Seeds | Divided Fountain Grass
LATIN NAME: Pennisetum divisum
COMMON NAME: Divided Fountain Grass
Plant Profile
Tillering from buried nodes is the species’ central trick. Its crown is a moving target that tracks the sand surface rather than sitting at a fixed depth. New nodes root as they are covered, anchoring the plant while it grows upward, and the old stems below knit into a fibrous column that holds loose sand. Wind-scoured plants answer by pushing fresh shoots from the base, so the grass persists on accreting and deflating dunes alike.
The head is a spike-like panicle in which each spikelet sits inside an involucre of bristles fused at the base. Those bristles give the genus its English name and give the head its shape. At maturity the bristles and the grain travel together as one light dispersal unit that rolls over bare ground in the wind, which is how the grass reaches fresh sand far from the parent clump.
Grass leaves are composite engineering. Cell walls in this genus carry esterified hydroxycinnamic acids, chiefly ferulic acid and p-coumaric acid, which cross-link the arabinoxylans of the wall, while opaline silica bodies are laid down through the epidermis. The blade that results is abrasive and hard to digest, which is also why feeding value falls once the stems elongate.
Like most warm-season panicoid grasses it runs the C4 pathway, with phosphoenolpyruvate carboxylase concentrating carbon dioxide around the bundle-sheath cells. That anatomy explains the pairing of fast growth in heat with thrifty water use.
Science & Biotechnology
The genus matters to plant scientists for a second reason: apomixis, seed formation without fertilisation. Pennisetum squamulatum is the classic case; the trait has been tracked to a dominant genomic region, and a gene from it, ASGR-BBML, has been shown to be capable of triggering embryo formation in sexual plants. Breeders of pearl millet want that switch so hybrid vigour can be fixed in seed.
Uses & Benefits
Three uses keep the grass in circulation across its native belt, each resting on a different part of the plant.
Tufts are cut and carried to stock while the growth is young and leafy. Grazing animals refuse the mature bristle heads, so the practical approach is to cut, wilt the herbage briefly, and feed it fresh with a supplement. Because the plant tolerates salt and poor sand, it grows on ground too marginal for a conventional fodder crop.
Tufts spaced across a dune face root at every buried node and build a fibrous mat that resists wind scour. Restoration work uses it alongside other psammophytes where rainfall is too low for conventional cover crops.
Growing from Seed
Three species share the catalogues and are constantly confused. Pennisetum setaceum carries long pink-purple bristles and colonises warm roadsides; Pennisetum alopecuroides makes fat, pale caterpillar heads and wants summer moisture; desert fountain grass keeps shorter, paler bristles and sulks in rich, wet soil. When a plant in an irrigated border collapses, provenance is usually the explanation.
The species resents organic-rich, water-retentive media. Build the mix from roughly three parts coarse sand or fine grit to one part loam, with a little leaf mould; a neutral to alkaline reaction suits it better than an acid one.
Water new plantings through their first summer, then treat them as dry-garden subjects. Established clumps manage on rainfall alone in warm climates and dislike wet ground in winter. Scale insects and rust appear on plants kept soft and shaded; the remedy is more sun and less water.
Our Take
If you grow Chinese fountain grass in a moist border, put desert fountain grass where the hose never reaches and the soil is thin. Two dry-country companions sit on the same shelf: Stipagrostis plumosa, a feathery sand grass, and Panicum turgidum, whose tussocks hold whole dunes together. Give all three full sun, sharp drainage, and a division every few springs.
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