Across a Simple Gravel Strip in a Front Garden, a Drift of Pennisetum Turns Every Breeze into a Ripple of Swaying Seed-Heads.

Soft, Tactile Plumes From Late Summer Into Autumn

Pennisetum, often called fountain grass, is all about those irresistible, brush‑like flower heads. From late summer, arching stems rise above the foliage, each one topped with a soft bottlebrush plume that begs to be stroked as you pass. Colours range from pale straw and warm biscuit tones to richer pinkish shades, depending on the variety. In low evening light the seedheads glow beautifully, adding a gentle, romantic note to borders, gravel gardens and pots. In a typical UK season, especially in a sunny, sheltered spot, the show carries well into autumn, just when you need something fresh in the garden.

  • Soft, Tactile Plumes From Late Summer Into Autumn
  • Neat, Rounded Clumps That Stay Where You Put Them
  • Perfect For Pots, Small Gardens And Modern Schemes

Pennisetum at a Glance:

Common name: Fountain grass, sometimes Chinese fountain grass.

Latin name: Pennisetum

Size in UK gardens: Usually 50–100cm tall in foliage, with flower stems reaching 60–120cm; clumps often 40–80cm wide depending on variety.

Best position: A sunny, reasonably sheltered spot – ideal in the front or middle of a border, in gravel plantings, or in large containers.

Soil: Free‑draining, moderately fertile soil; dislikes cold, heavy, waterlogged ground in winter. In pots, use a good loam‑based compost with added grit.

Main interest: Arching mounds of narrow foliage and soft, bottlebrush flower heads from late summer into autumn, followed by attractive winter silhouettes.

Fragrance: Not grown for scent – appeal is in texture, movement and subtle colours.

Hardiness: Many Pennisetum alopecuroides forms are borderline hardy to hardy in milder UK gardens if kept well drained; tender species like P. setaceum ‘Rubrum’ are best treated as seasonal or given winter protection.

Care level: Moderate – easy to grow in the right spot, but needs sharp drainage, full sun and a simple yearly cut‑back to thrive.
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Home-grown, backed by local specialists.

The Simpson’s team raises the majority of our trees here at the nursery. For varieties outside our own production, we work with independent local growers we trust - all chosen for UK climate suitability.

Pennisetum Care at a Glance:

Planting time: As container‑grown grasses, Pennisetum can be planted in most months when the ground isn’t frozen or waterlogged; late spring and early autumn are usually easiest, giving roots time to establish before extremes of heat or cold.

Watering: Water regularly in the first season so the rootball and surrounding soil don’t dry out completely, especially in very free‑draining or raised beds. Once established in the ground, they are fairly drought‑tolerant but appreciate an occasional deep soak in long dry spells.

Feeding: Fountain grasses don’t need heavy feeding – excessive fertiliser can make growth soft and floppy. A modest mulch of compost in spring is usually enough; on very poor soils, a light balanced feed in early spring can help.

Pruning: Leave the foliage and plumes standing through winter for structure and protection, then cut back the whole clump close to the base in late winter or very early spring, just before new growth starts.

Winter: In the ground, main winter care is about drainage and leaving the top growth on as a “coat”. In colder gardens, you can mulch around the base and be prepared for tender forms to be grown in pots and brought under cover.

Frequently Asked Questions

Most Pennisetum alopecuroides cultivars used in UK gardens reach roughly 60–100cm tall in flower, with clumps around 40–80cm wide. That’s enough to make a statement, but not so large that they automatically dominate a modest border. The key is to choose the right variety for your space – some are very compact, others taller – and to give each clump enough room so its fountain shape can be appreciated without crowding neighbours. In a small garden, one or three clumps placed carefully can provide all the movement and texture you need without overwhelming the planting.

Hardiness depends on the species and your local conditions. Many forms of Pennisetum alopecuroides are reasonably hardy in milder parts of the UK, especially in well‑drained soil and sunny, sheltered spots, and will return reliably after winter. More tender species such as Pennisetum setaceum ‘Rubrum’ are unlikely to survive frost outdoors and are best grown as summer bedding or overwintered frost‑free. In colder or wetter gardens, it’s vital to provide sharp drainage and to leave the top growth on over winter, treating borderline‑hardy forms with a little extra care.

The best time to cut back fountain grasses is in late winter or very early spring, just before new growth appears. Up until then, the old foliage and plumes provide structure and some protection for the crown. Simply gather the stems in handfuls and shear them down to a few centimetres above the base, taking care not to slice emerging shoots. Remove the cut material so it doesn’t smother new growth. After that, you can largely leave the clump alone for the season, apart from the odd dead stem you notice and remove as you walk by.

Yes, many Pennisetum cultivars are excellent in containers, provided you choose a generous pot with good drainage and pay attention to watering. In a large container – perhaps teamed with low seasonal colour or simple groundcover – a single grass can make a striking, low‑maintenance feature on a patio or by a front door. Use a loam‑based compost with some added grit, water when the top of the compost feels dry, and feed lightly in spring. In cold spells, especially with borderline‑hardy or tender types, move pots to a sheltered spot and protect the rootball from severe freezing, then enjoy the fresh fountain of growth again the following year.