Plant problems

Why Are My Eleusine Leaves Curling?

Q: Is eleusine indica a weed in the UK?

Eleusine indica (goosegrass, yard grass) is a casual introduction or sporadic naturalized annual weed in the warmest parts of the UK, primarily southern England, where it appears in warm summers in compacted, disturbed, or waste ground — garden paths, driveways, gateways, and trampled turf — but it is not persistently naturalised across the UK in the way it is in many warmer countries. Eleusine indica is one of the world's most widespread and successful annual weed grasses in tropical, subtropical, and warm-temperate regions globally, occurring on every inhabited continent; it is particularly characteristic of compacted, hard-worn, disturbed soils where it benefits from its tolerance of soil compaction and foot traffic that kills or suppresses most competing vegetation; in the warm parts of the USA, Australia, Africa, and South and Southeast Asia it is a significant weed of paths, driveways, gardens, waste ground, sports turf, and some arable crops, requiring active management to control. In the UK, the cool, variable summer climate limits its establishment to the warmest summers and the warmest, most sheltered sites in southern England; the first autumn frosts kill it completely, and in cooler UK summers it often fails to establish at all from the soil seed bank. It is not a common or widespread weed across most of the UK. The crop plant Eleusine coracana (finger millet, teff, ragi) is a related species of major agricultural importance in tropical and subtropical Africa, South Asia, and East Africa; it is one of the principal cereal crops of eastern and southern Africa but is not grown as a crop in the UK. The name 'finger grass' is applied to both Eleusine and Digitaria species; the finger-like, digitate seed head arrangement is the shared feature that gives both genera this common name.

Q: How do I identify eleusine indica in a UK garden?

Eleusine indica (goosegrass) can be identified in a UK garden by the following features: it is a warm-season annual that germinates from late spring and forms a strongly flattened, spreading mat with distinctly compressed, flattened, keeled stems (culms) — this strongly flattened or 2-ranked growth habit is the most immediately distinctive identification feature; the plant lies very flat to the ground, with the stems and leaves arranged in a strongly 2-ranked (distichous) flat fan shape that is quite unlike the rounded, upright, or spreading growth of most UK lawn grasses and weed grasses; the leaves are flat, smooth, broad (4 to 7 mm wide), with a prominent midrib or keel, and have a distinct fold or crease at the base; the leaf sheaths are strongly flattened and keeled, giving the whole plant a visually distinctive flattened character; the leaf surface is smooth and glossy; the whole plant is smooth (lacking hairs) in contrast to the hairy Digitaria sanguinalis; the seed head is highly distinctive and resembles the finger-like or digitate arrangement of Digitaria: two to nine finger-like racemes arranged in a whorled or digitate pattern at the top of the stem, each raceme carrying two rows of closely overlapping, flattened spikelets pressed close to the raceme axis; the seed head is green to grey-green, with a star or fan shape when viewed from above; it is produced from July or August in UK conditions. The strongly flattened, keeled stems and the fan-like or star-shaped seed head viewed from above are the two most reliable field identification features for Eleusine indica.

Q: What is eleusine coracana and is it grown in the UK?

Eleusine coracana (finger millet, teff, ragi, or wimbi in different regional languages) is a species of major agricultural importance in tropical and subtropical Africa and South Asia; it is one of the principal cereal crops of Ethiopia, Kenya, Uganda, Tanzania, and many other countries in eastern and southern Africa, and is an important cereal in South India and Nepal, where it is used to make a range of traditional foods including fermented porridges, flatbreads, and alcoholic drinks. It is not grown as a commercial crop in the UK or elsewhere in temperate northern Europe because its warm-season C4 growth habit and tropical origin make it unsuited to the cool, variable UK summer growing season; in a warm UK greenhouse or polytunnel it can be grown for interest as an educational or novelty plant but will not produce a significant grain yield. The grain of Eleusine coracana is highly nutritious, with a notably high calcium content relative to most other cereal grains, and the whole-grain flour is used in traditional cooking across its range in Africa and South Asia; it is available from African and Asian food shops in many UK cities as a health food ingredient. Interest in finger millet as a climate-resilient, nutritious grain crop has grown internationally in recent years given its tolerance of drought and low-fertility soils relative to maize (Zea mays) and other major cereals; it is a subject of active crop improvement research in its primary growing regions. Eleusine indica (goosegrass, wild finger grass) is the weedy relative of E. coracana; the two species are closely related and are sometimes crossed in crop improvement programmes studying disease resistance and drought tolerance.

Eleusine indica (goosegrass, yard grass) is a warm-season annual weed grass found mainly in southern England in warm summers, identifiable by its strongly flattened, keeled stems and the star-shaped or fan-like finger seed head. Leaves curl and yellow from cold temperatures, drought in hot conditions, or insufficient warmth for establishment in cooler parts of the UK.

Cold and autumn die-back

Eleusine indica is a warm-season C4 annual killed by the first autumn frosts; as temperatures drop in September and October, the flat, keeled leaves curl, yellow, and the plant dies rapidly. In the UK, this autumn die-back is the most common cause of leaf curl in established plants. As with other warm-season annual weeds, the end-of-season die-back in autumn is not a treatable cultural problem; it is the normal lifecycle end for a plant that has completed its annual cycle.

What to do

Remove plants before the finger-like seed heads mature to reduce the soil seed bank; seeds can persist in the soil for several years. Hoe or pull in dry weather. The UK climate limits eleusine primarily to southern England in warm summers; maintaining a thick mulch or a dense lawn sward prevents most germination, and the plant rarely becomes a serious persistent weed in cooler or wetter UK conditions.

Drought stress

Eleusine indica is adapted to compacted, hard-worn, dry conditions and tolerates soil compaction and drought better than many grass species; however, the flat leaves still curl inward and the plant wilts in extended hot, dry afternoon conditions. The plant characteristically recovers overnight as temperatures drop; the wilting and leaf curl is primarily cosmetic and a mild-to-moderate drought rarely kills established plants. Severe, prolonged drought may cause more persistent leaf curl and yellowing at the tips.

What to do

In a garden context, eleusine is almost always encountered as a weed rather than as a cultivated plant; the drought tolerance of the species means it is typically the surrounding desirable plants rather than the eleusine itself that need irrigation in a dry UK summer. Removal before seed set is the appropriate management response; the drought curl is a secondary observation rather than the main management concern.

Insufficient warmth for establishment

Eleusine indica requires warm soil temperatures for reliable germination and establishment; in a cool, wet UK spring or in the cooler parts of the UK (Scotland, northern England, Wales), it often fails to establish or produces very slow, weak seedling growth. This means eleusine is primarily a weed concern in southern England in warm summers; in cooler UK regions and cooler summers it is rarely seen. Weak, cool-established seedlings show slow growth and leaf curl that resolves only if temperatures subsequently warm sufficiently.

What to do

In most of the UK, eleusine is not a persistent weed concern; the climate naturally limits its establishment. In southern England on warm, sandy, or compacted disturbed soils, maintain a thick mulch layer (5 to 7 cm) or a dense lawn sward to prevent germination; the cool-soil germination requirement means that shading the soil surface with mulch or dense vegetation is highly effective at preventing eleusine from establishing even in warm-summer years.

Frequently asked questions

Why are my eleusine leaves curling?

Eleusine leaves curl most commonly because of cold temperatures and autumn die-back (warm-season C4 annual killed by first autumn frosts; leaf curl and collapse in September to October is normal end-of-life; remove plants before seed head matures to reduce soil seed bank), drought stress (tolerant of compacted dry conditions but leaves still curl in afternoon heat; overnight recovery typical; remove before seed set rather than treating drought), or insufficient warmth for establishment (requires warm soil for germination; fails to establish in cool UK springs or cooler regions; primarily a southern England warm-summer weed concern). Thick mulch or dense turf prevents most UK eleusine establishment.

Is eleusine indica a weed in the UK?

A casual introduction or sporadic naturalized annual in the warmest parts of southern England; appears in warm summers in compacted, disturbed, or waste ground (paths, driveways, trampled turf); not persistently naturalized across the UK. One of the world's most widespread annual weed grasses in tropical, subtropical, and warm-temperate regions globally; characteristic of compacted hard-worn soils; significant weed in the warm USA, Australia, Africa, and South and Southeast Asia. UK cool, variable summers limit its establishment to the warmest sites in the warmest years; first autumn frosts kill it completely; not a widespread or common UK weed across most of the country.

How do I identify eleusine indica in a UK garden?

Strongly flattened, spreading mat with distinctly compressed, keeled stems arranged in a flat fan shape (the most immediately distinctive feature; unlike any UK lawn grass or common weed grass). Leaves flat, smooth, broad (4 to 7 mm), with a prominent midrib or keel and a distinct fold at the base; leaf sheaths strongly flattened and keeled; whole plant smooth (lacking hairs; distinct from hairy Digitaria sanguinalis). Seed head distinctive: two to nine finger-like racemes in a whorled or digitate pattern; green to grey-green; star or fan shape viewed from above; produced from July to August in UK conditions. Strongly flattened keeled stems plus the fan-like seed head are the two most reliable field identification features.

What is eleusine coracana and is it grown in the UK?

Finger millet (teff, ragi, wimbi): a major cereal crop of tropical and subtropical Africa and South Asia; important food grain in Ethiopia, Kenya, Uganda, Tanzania, and South India. Not grown commercially in the UK (too cool for reliable grain production); can be grown in a UK greenhouse as a novelty or educational plant. Grain is highly nutritious with notably high calcium content; available from African and Asian food shops in UK cities as a health food ingredient. Increasingly studied as a climate-resilient crop given drought and low-fertility tolerance; active crop improvement research ongoing. Closely related to E. indica and sometimes crossed in crop improvement research.