Plant problems

Why Are My Eragrostis Leaves Curling?

Q: Will eragrostis flower in the UK?

Yes, Eragrostis curvula (weeping love grass) and Eragrostis spectabilis (purple love grass) can flower well in the UK in a warm, sunny, sheltered position in freely draining soil, particularly in the warmest UK regions and in warm UK summers. Eragrostis curvula, with its weeping habit and clouds of fine, olive-green to bronze-purple flower panicles, is the more reliably flowering of the two in the UK and flowers freely from July to October in a warm, sunny, freely draining position in the south and midlands of England; it is also better adapted to the variability of UK summers and flowers in moderately warm conditions as well as in the warmest years. Eragrostis spectabilis (purple love grass) is one of the most beautiful of all ornamental grasses when in full flower — the entire plant is covered in a cloud of luminous, shimmering, wine-red to purple flower panicles in July and August in its native North American range — but its performance in the UK is more weather-dependent; in warm UK summers in the south it can produce a genuinely beautiful flower display, but in cool or cloudy UK summers the display is often sparse. Both species require full sun, very freely draining soil, and the warmest available position for the best flower display in the UK. The flower panicles of both species are particularly beautiful when backlit by low afternoon or evening sun. Both species are at their most spectacular from July to September in good years; the display fades as autumn temperatures fall.

Q: How do I grow eragrostis in the UK?

Eragrostis curvula and Eragrostis spectabilis grow best in a warm, sunny position in poor to moderately fertile, very freely draining, slightly acid to neutral soil; these are grasses of dry, open, sunny habitats and they perform at their best in the leanest, sunniest, most freely draining conditions in the UK. Full sun is essential; even partial shade reduces vigour, flower display, and increases the risk of poor performance in cool, wet UK conditions. In heavy or wet soil, grow in a raised bed with 50% coarse grit or in very gritty, free-draining soil; wet winter conditions are the most common reason for failure in UK gardens. Plant in spring (April to May); avoid autumn planting as the plants need a full growing season to establish before their first UK winter. These are warm-season grasses that grow slowly in cool UK springs but accelerate significantly from June to August; do not overfeed or overwater in a cool spring trying to force growth. Water through the first growing season in dry conditions; once established, eragrostis is drought-tolerant and rarely needs watering in UK conditions. Do not feed — lean soil produces the best growth and flower display; high fertility produces lush, floppy, uncharacteristic growth. Cut back to 10 to 15 cm in late February or early March before new growth begins. Both species are moderately hardy in the UK; Eragrostis curvula tolerates temperatures to approximately -10 to -15°C in freely draining soil, while Eragrostis spectabilis is slightly less frost-hardy and may need protection in colder UK gardens.

Q: Is eragrostis curvula hardy in the UK?

Eragrostis curvula (weeping love grass, African love grass) is moderately hardy in the UK; in freely draining, lean, gritty soil in a warm, sheltered, sunny position it tolerates temperatures to approximately -10 to -15°C and is reliably perennial in most UK gardens south of Birmingham. In poorly draining soil, wet winter conditions are far more damaging than cold alone; wet clay in winter kills eragrostis far more reliably than cold temperatures in well-draining gritty soil. In the coldest UK regions (northern Scotland, exposed upland positions), eragrostis is best treated as a tender perennial and either overwintered under frost-free cover from November or purchased fresh each spring. In most UK gardens in the south and midlands, eragrostis in a freely draining, sheltered, sunny position with lean, poor soil survives most UK winters without significant damage, with new growth from the crown appearing in May or June. Eragrostis spectabilis (purple love grass) is slightly less cold-hardy than E. curvula and may need protection in colder UK gardens, or may be lost in severe UK winters even in the south. In either species, excellent drainage is the single most important factor for winter survival; cold + wet = failure, cold + dry = survival in most UK gardens.

Eragrostis (love grass) produces fine, hair-like foliage and spectacular clouds of airy flower panicles from July to September. Eragrostis curvula (weeping love grass) and E. spectabilis (purple love grass) are the main ornamental species in UK gardens. Both are warm-season, drought-tolerant grasses of dry, sunny habitats; waterlogging and shade are their main enemies in UK cultivation.

Waterlogging and wet soil

Eragrostis species are grasses of dry, open habitats; in heavy, persistently wet, poorly draining UK garden soil the roots are damaged through winter and the leaves curl, yellow, and brown as the root system fails. Wet winter soil is the most common reason eragrostis fails or disappears from UK gardens between seasons. The rule is simple: excellent drainage is non-negotiable.

What to do

Grow in very freely draining, lean, gritty soil in full sun. In heavy or wet soil, grow in a raised bed with 50% coarse grit compost. Avoid clay, low-lying, or north-facing positions that hold water in winter. Apply a dry grit mulch around the crown from November to shed winter rain away from the crown. If the position cannot be made freely draining, switch to a grass that tolerates wet conditions (molinia, deschampsia, glyceria) and grow eragrostis in pots of gritty compost.

Too much shade

Full sun is essential for eragrostis; even partial shade reduces vigour, causes pale, weak foliage, and results in a sparse or absent flower display. In deep shade, the fine leaves become pale and the clumps produce floppy, untidy growth prone to browning. The spectacular airy flower panicles that make eragrostis so valuable are only produced freely in full, unshaded sun in the UK.

What to do

Move to the sunniest, most open position available. South or south-west facing positions in freely draining soil produce the best growth and flower display. If the garden is predominantly shaded, eragrostis is not the right grass for it; substitute with a shade-tolerant species such as deschampsia, luzula, or carex for fine-textured, airy foliage effects in shaded positions.

Insufficient summer heat

Eragrostis are warm-season grasses that grow most actively from June to August; in a cool UK spring or a cold, cloudy UK summer the plants grow slowly, look sparse, and may produce limited flowers. This is a climate limitation rather than a cultural error. The display is most reliable in the south of England and in warm UK summers; in northern UK regions and in cool summers, expectations should be set accordingly.

What to do

Maximise warmth by growing against a warm south-facing wall, in a sheltered courtyard, or in a raised bed that accumulates heat; these micro-climatic positions add several degrees of warmth in summer and significantly improve both the vigour and the flower display. In cool UK regions, try Eragrostis curvula in preference to E. spectabilis as it is the more reliably flowering of the two in variable UK conditions.

Frequently asked questions

Why are my eragrostis leaves curling?

Eragrostis leaves curl most commonly because of waterlogging or wet winter soil (root damage in poorly draining positions; grow in very freely draining gritty soil; raised bed with 50% grit; dry crown mulch from November), too much shade (full sun essential; partial shade causes pale, weak, floppy growth and sparse flowers; open, unshaded, south-facing position needed), or insufficient summer heat (warm-season grass; cool UK springs cause slow start; accelerates from June; E. curvula more reliable in cool conditions than E. spectabilis). Drainage and full sun are the two non-negotiable requirements.

Will eragrostis flower in the UK?

Yes in warm, sunny, freely draining positions in the south and midlands of England in warm UK summers. E. curvula flowers more freely and reliably in UK conditions than E. spectabilis. Full sun, very free drainage, and lean soil are essential. The flower panicles (olive-green to bronze in E. curvula, wine-red to purple in E. spectabilis) are produced from July to October and are spectacular when backlit by low afternoon sun. In cool UK summers or northern regions, the display is often sparse or limited; warm summers produce the best results.

How do I grow eragrostis in the UK?

Grow in a warm, sunny, open position in poor to moderately fertile, very freely draining, slightly acid to neutral soil. Full sun and excellent drainage are essential. Raised bed with 50% grit in heavy soil. Plant in spring. Do not feed. Drought-tolerant once established. Dry crown mulch from November. Cut back to 10 to 15 cm in late February. In cold UK gardens, E. curvula in freely draining gritty soil survives most UK winters; E. spectabilis is slightly less hardy and may need protection or annual replacement in colder regions.

Is eragrostis curvula hardy in the UK?

Moderately hardy; tolerates approximately -10 to -15°C in freely draining conditions. Reliably perennial in most UK gardens south of Birmingham in a warm, sheltered, freely draining position with lean, gritty soil. Cold in wet conditions is far more damaging than cold alone; wet clay in winter kills eragrostis far more reliably than cold. In northern Scotland and exposed positions, treat as a tender perennial. In most southern UK gardens in well-drained soil, survives UK winters with new growth from the crown appearing in May to June. E. spectabilis is slightly less cold-hardy and may need protection even in southern gardens in severe winters.