Lampenpoetsersgras

Pennisetum alopecuroides

Engels: Fountain Grass

ornamental grassPoaceae

Lampenpoetsersgras (Pennisetum alopecuroides) is a ornamental grass from the Poaceae family that grows up to 80cm tall. This plant thrives in full sun and requires low maintenance. Blooms in late summer and autumn with pink flowers and attracts birds.

Hoogte

40–80 cm

Breedte

40–60 cm

Zonligging

full sun

Waterbehoefte

low water needs

Grondsoort

loam, sandy soil

Onderhoud

low maintenance

Bloeitijd

late summer, autumn

Bloemkleuren

pink

Ecologische waarde

Trekt vogels aan

Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
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Care tips

Planting

Fountain grass thrives in full sun and well-drained soil, making it ideal for sunny borders, gravel gardens, or prairie-style plantings. It tolerates both loam and sandy soils but dislikes heavy clay or waterlogged conditions. Before planting, work in some grit or sharp sand if your soil is prone to sitting wet, especially over winter. Plant container-grown fountain grass in April, May, or September. Spring planting gives the roots a full growing season to establish before winter, while September planting works well if the soil is still warm and you can water during dry spells. Dig a hole roughly twice the width of the root ball and about the same depth. The crown of the plant—where the stems meet the roots—should sit at soil level, not buried deeper. Space plants 60 cm apart to allow each clump room to develop its characteristic arching fountain shape without crowding neighbours. If you're planting in groups, stagger them in drifts rather than rigid rows for a more natural effect. After planting, firm the soil gently around the roots and water thoroughly to settle everything in. A 5 cm layer of gravel or grit mulch around the base helps suppress weeds and improves drainage, which is particularly useful on heavier soils. Avoid organic mulches like bark or compost piled against the crown, as fountain grass prefers drier conditions at its base. Water regularly for the first few weeks if rainfall is scarce, but once established this grass has low water needs and tolerates dry spells well.

Pruning

Fountain grass requires very little pruning, but an annual tidy-up in March is essential to keep plants healthy and looking their best. The key rule is to leave the foliage standing over winter. The dried flower plumes and bleached leaves provide structure and movement in the garden from late autumn through to early spring, and they also offer some frost protection to the crown. In March, before new growth emerges, cut back all the old foliage and spent flower stems to within 5–10 cm of the ground. Use a pair of sharp hand shears or secateurs for smaller clumps; for larger, established plants a pair of hedging shears speeds up the job considerably. Some gardeners find it easier to gather the foliage into a bundle with one hand (or tie it loosely with string) before cutting through in one go. Remove all the cut material from the crown of the plant to prevent it smothering new shoots and to reduce the risk of fungal problems in damp springs. If your clump has become very dense or the centre looks dead or sparse after several years, March is also the time to lift and divide it. Dig up the entire clump, split it into smaller sections using a sharp spade or knife, and replant the vigorous outer portions, discarding the woody centre. Beyond this annual cut-back, fountain grass needs no deadheading or shaping during the growing season. Let the pink-tinged flower plumes develop naturally from late summer onwards—they're the plant's main ornamental feature and will fade gracefully into winter.

Maintenance

Fountain grass is genuinely low-maintenance once established. Its water needs are low, and mature plants tolerate drought well thanks to deep roots. In a typical year you won't need to water at all, though newly planted specimens benefit from occasional watering during prolonged dry spells in their first summer. Avoid overwatering or planting in poorly drained spots, as this grass resents sitting in wet soil, particularly in winter. Feed once a year in April with a general-purpose granular fertiliser such as blood, fish and bone or Growmore, scattered lightly around the base of the clump. A single application is enough; overfeeding produces lush, floppy growth that's prone to flopping and less tolerant of cold. On poor sandy soils a light top-dressing of garden compost in spring can be beneficial, but on average to fertile soil no additional feeding is necessary. Fountain grass is fully hardy in zones 5a–9b and overwinters reliably in temperate Europe without protection. The dried foliage left standing provides natural insulation for the crown. In very exposed or wet gardens, a loose collar of grit or gravel around the crown can help prevent winter rot, but this is rarely needed in well-drained sites. Pests are uncommon. Slugs occasionally nibble emerging shoots in spring but rarely cause serious damage. Diseases are also rare, though crown rot can occur if the plant sits in waterlogged soil over winter—good drainage at planting time is the best prevention. In prolonged wet summers, rust may occasionally appear as orange spots on leaves, but it's seldom serious and disappears as conditions dry out.