Elaeagnus Leaves Curling

Scale insects

Scale insects are the most significant pest on elaeagnus and the most common cause of yellowing, curling leaves and gradual plant decline. Several scale species colonise elaeagnus, with brown soft scale (Coccus hesperidum) and mussel scale (Lepidosaphes ulmi) among the most frequently encountered. The flat, waxy, limpet-like insects attach firmly to the stems and to the undersides of the silvery leaves, piercing the tissue and extracting sap. Because the silvery, textured surface of elaeagnus stems and leaves provides excellent camouflage for the insects, which are also brown or grey themselves, scale infestations can establish and grow to significant size before being noticed. The most visible symptom is often not the insects themselves but the black sooty mould that develops on the honeydew they secrete, coating the stems and the upper surfaces of the leaves below the infestation. Heavily colonised plants weaken progressively: leaves yellow, curl, and drop earlier than normal, growth becomes weak and sparse, and the vigour of the previously robust shrub diminishes noticeably over successive seasons.

Inspect elaeagnus stems closely in winter and early spring, when the absence of obscuring foliage on lower stems and better lighting makes scale insects easier to spot. Light infestations can be controlled by wiping the scales off the stems with a damp cloth or scrubbing with a soft brush and soapy water. For established, heavier infestations, apply horticultural oil spray to all stems and leaf undersides in late spring when the young crawlers are active and most vulnerable. A follow-up application six weeks later improves control. During the annual pruning of elaeagnus, which is best done in spring on the evergreen types, cut out the most heavily colonised old wood and replace with clean new growth. Washing sooty mould from the leaves with soapy water after treating the scale restores the plant's ornamental silver colouring and its photosynthetic efficiency.

Drought

Drought stress causes elaeagnus leaves to curl and lose the bright, metallic silver sheen of the undersides that is the plant's most distinctive ornamental feature. Although elaeagnus is among the most drought-tolerant broad-leaved evergreen shrubs available for UK gardens, particularly once established, young plants in their first two seasons and those in very free-draining, sandy soils are susceptible to moisture stress in prolonged dry summers. Wall-trained elaeagnus, often used in coastal and exposed gardens where the shelter of a wall is valuable, is more drought-prone than open-grown plants because the wall creates a dry zone at its base. Container-grown elaeagnus sold as a specimen plant is also vulnerable in summer. In drought stress, the leaf margins curl inward first, followed by the whole leaf in severe cases, and the metallic underside colouring becomes dull rather than bright silver.

Water newly planted elaeagnus consistently through its first growing season. Mulch annually to retain soil moisture, particularly important for wall-trained plants in the dry zone near the wall base. Established, open-grown elaeagnus in average garden soil is genuinely self-sufficient in typical UK summers and is valued precisely for its ability to perform without attention in difficult, exposed, or dry conditions. The plant's silver leaf colouring is an adaptation to reflect intense sunlight and reduce moisture loss, making it naturally better equipped for dry conditions than most other evergreen shrubs of similar size.

Coral spot

Coral spot fungus (Nectria cinnabarina) occasionally causes dieback and leaf curl on elaeagnus, typically entering through dead wood, damaged bark, or old pruning wounds and spreading into adjacent living stems. The disease is identified by the small, coral-pink or orange pustules that appear on dead bark, which are the fungal fruiting bodies. Dieback of individual stems progresses from the tip downward, with the leaves on affected stems wilting, curling, and browning as the fungal infection interrupts the flow of water and nutrients. Coral spot is primarily an opportunistic disease, most likely to establish on plants already weakened by other stresses including drought, waterlogging, frost damage, or scale insect infestation. Elaeagnus with a significant amount of dead wood from any cause, left unpruned, is particularly at risk.

Remove all dead wood from elaeagnus promptly during the annual pruning, cutting back to healthy, living tissue and disinfecting tools between cuts. Do not leave dead branch stubs as entry points for coral spot. Remove and bin all cut material showing coral spot pustules. Healthy, vigorously growing elaeagnus in a suitable position resists coral spot infection effectively: the best prevention is maintaining plant health through appropriate siting, watering during establishment, and annual removal of any dead or damaged wood before the fungus can enter.

Waterlogging

Waterlogging causes root rot and gradual decline in elaeagnus, producing yellowing leaves, leaf curl, and progressive dieback that can be mistaken for drought stress or scale insect damage. Elaeagnus is notably tolerant of a wide range of soil conditions and will grow in poor, alkaline, and dry soils that defeat most other evergreen shrubs. However, it will not tolerate genuinely waterlogged conditions: in permanently saturated or compacted soil, the roots suffocate and the plant declines. The problem is most common on plants in heavy clay in low-lying positions or in compacted ground adjacent to new building works. The symptoms develop slowly over one to two seasons, making waterlogging damage harder to diagnose promptly than the rapid wilting caused by drought.

Plant elaeagnus in freely draining to moderately moisture-retentive soil. Its exceptional adaptability means it thrives in poor, dry, even saline coastal conditions but fails in wet, stagnant ones. In heavy clay soils with drainage problems, planting on a slight rise and incorporating grit at planting gives elaeagnus enough advantage to establish successfully where a lesser shrub might fail. If an established plant is in a waterlogged position, improving drainage by deep spiking and incorporating grit around the root zone is worth attempting before replacing the plant.

Aphids

Aphids occasionally colonise elaeagnus, targeting the soft new growth that appears in spring after pruning or in autumn when some elaeagnus species produce a second flush of growth. Dense colonies of pale or greenish aphids cluster at the shoot tips and cause the newest leaves to curl around them. Aphid infestations on elaeagnus are generally less severe and less persistent than on many other garden shrubs, partly because the tough, fibrous leaves of mature elaeagnus growth are not particularly attractive to aphids, and partly because the robust growth of a healthy elaeagnus quickly outgrows moderate aphid pressure. The main period of vulnerability is immediately after pruning, when the soft, sappy new growth produced in response to cutting is much more appealing to aphids than the mature, hardened foliage.

Treat aphid colonies on elaeagnus with a jet of water directed at the affected shoot tips, followed by insecticidal soap spray if needed. Natural predators are effective on most garden elaeagnus and the infestation rarely requires more than one treatment. Timing any major pruning of elaeagnus for mid-spring, when predator populations are beginning to build rather than in autumn when they have declined, reduces the vulnerability of the resulting new growth to aphid colonisation.

Reversion in variegated forms

Reversion is not a disease but it is the most frequently noticed and alarming change on variegated elaeagnus such as Elaeagnus pungens Maculata (gold-centred leaves) and Elaeagnus x ebbingei Gilt Edge (gold-margined leaves). Reverted shoots are plain green without the yellow or cream variegation, and they grow significantly more vigorously than the variegated growth because they have more chlorophyll and can photosynthesise more efficiently. Left unchecked, reverted growth quickly dominates the plant and the distinctive variegated appearance is lost within a few seasons. Reverted shoots do not cause leaves to curl, but gardeners often notice them alongside other problems because the contrast in growth rate and leaf colour draws attention to the plant.

Remove all reverted plain-green shoots from variegated elaeagnus as soon as they appear, cutting back to the point where the shoot arises on the main stem or removing the entire stem at the base. Do not shorten reverted shoots or leave any of the plain-green growth in place: any remaining reverted tissue will simply regrow and dominate again. Check the plant regularly through the growing season as reversion can occur at any time. Maintaining a vigorous, well-pruned plant with good light penetration to all parts of the canopy reduces, but does not entirely eliminate, the tendency to produce reverted shoots.

Frequently asked questions

Why are my elaeagnus leaves curling?

Scale insects are the most common cause of leaf yellowing and curling on elaeagnus, feeding on the stems and leaf undersides and weakening the plant over time. Drought stress causes the silvery leaves to curl and lose their metallic sheen in hot, dry conditions. Coral spot fungus on dead wood can spread into living stems and cause progressive dieback and leaf curl on affected branches.

Why are my elaeagnus leaves turning yellow?

Yellowing on elaeagnus most often indicates scale insect infestation, where heavy colonies on the stems gradually weaken the plant and cause leaf discolouration. Waterlogging causes root rot and produces similar yellowing from the base of the plant upward. Some loss of older leaves in autumn is natural on elaeagnus pungens (the evergreen types), which renew their foliage gradually rather than all at once.

Why has my elaeagnus got green shoots?

Plain green shoots on a variegated elaeagnus (such as Elaeagnus pungens Maculata or Elaeagnus x ebbingei Gilt Edge) are reverted shoots, which grow more vigorously than the variegated growth and will quickly take over the plant if not removed. Cut all-green shoots back to their point of origin on the main stem as soon as they appear, cutting right back rather than just shortening them. If left, the reverted growth dominates and the plant loses its ornamental variegation.

Is elaeagnus evergreen or deciduous?

The most commonly grown garden elaeagnus in the UK, including Elaeagnus pungens and its variegated forms and Elaeagnus x ebbingei, are evergreen and retain their leaves through winter. The silver-leaved Elaeagnus commutata and some other species are deciduous. Evergreen elaeagnus are highly valued for winter garden structure and as windbreak hedging in coastal and exposed gardens.