Bergenia, also called elephant ears or pigsqueak for the sound its leaves make when rubbed, is one of the most reliable evergreen perennials for shade gardens. Its large, glossy leaves and early spring flowers in pink, white, or magenta are practically bulletproof in most conditions. When those distinctive leaves start to curl, discolor, or collapse, something has broken down. Identifying the cause matters because the two most common culprits, vine weevil and frost, look similar but require completely different responses.
1. Vine weevil
Vine weevil (Otiorhynchus sulcatus) is the most damaging pest of bergenia, both in containers and in the open garden. Adult weevils, which are matt black and about 9 mm long, feed on leaf margins at night, creating distinctive U-shaped or scalloped notches along the edges of the large leaves. While this damage is disfiguring, it is the larvae that cause the most serious harm. White, C-shaped grubs hatch from eggs laid in the soil and spend late summer to early spring eating bergenia roots underground. As the root system is destroyed, leaves wilt, turn yellow, and curl despite normal watering, and plants can die suddenly even in mild conditions.
What to look for
- U-shaped or scalloped notches around leaf margins (adult feeding)
- Leaves wilting, curling, and yellowing despite moist soil
- Plant rocking loosely in the ground with little root resistance
- White, legless, C-shaped grubs with a brown head found in soil around roots
- Adults found under pots, debris, and loose bark when checked at night
How to fix it
Apply biological control nematodes (Steinernema kraussei) to moist soil in late summer or early autumn when soil temperature is above 5 C. This targets larvae at their most vulnerable stage before they grow large enough to cause serious root damage. Water the nematodes in thoroughly and keep soil moist for at least two weeks after application. Remove adult weevils by torchlight at night and drop them into soapy water. For container bergenia, repot into fresh compost each spring and check carefully for grubs. A systemic insecticide containing imidacloprid or thiacloprid can be applied as a drench where permitted.
2. Frost and cold damage
Bergenia is generally hardy but the large surface area of its leaves makes them sensitive to rapid temperature drops and drying winter wind. In cold weather, leaves naturally increase anthocyanin pigments, turning red, purple, or bronze, while also curling slightly to reduce exposed surface area. This is a normal protective response and the leaves typically flatten and return to green as temperatures rise in spring. However, a hard frost followed by bright morning sun can cause more severe curl and browning as ice crystals form in leaf cells and rupture them when they thaw too quickly.
What to look for
- Leaves rolling and reddening or purpling in response to cold
- Curl and color intensifying through winter and reversing in spring
- Brown, papery leaf edges or patches after a hard frost
- Damage most severe on exposed plants or those facing east (early morning sun after a frost)
- New growth emerging healthy from the crown in spring despite damaged older leaves
How to fix it
Normal winter curl and reddening requires no intervention. If hard frost damage has caused leaf browning, leave affected leaves in place until spring when new growth confirms recovery, then cut back damaged foliage to the base. In very cold or exposed gardens, protect the crown with a dry mulch of bark or straw in late autumn. Avoid siting bergenia in frost pockets or east-facing positions where the combination of cold nights and morning sun maximizes frost damage.
3. Slugs and snails
Slugs and snails target bergenia year-round, but are most active in autumn and early spring when the large, soft, overwintering leaves provide easy food. They rasp irregular holes in leaf surfaces and chew leaf edges, causing the damaged tissue to curl, crisp, and deteriorate. In shade gardens where bergenia thrives, the cool, moist conditions that slugs prefer are abundant, and damage can be substantial before it is noticed.
What to look for
- Irregular holes with ragged edges in leaf surfaces
- Leaf margins eaten and curling around damage sites
- Silvery slime trails on leaves and soil around the plant
- Damage appearing overnight or after rain
- Eggs, small slugs, or snails found under nearby debris
How to fix it
Apply wildlife-safe iron phosphate pellets around bergenia from early spring. Use copper tape barriers around containers. Check under pots and mulch at night and remove mollusks by hand. Encourage natural predators, including frogs, hedgehogs, and ground beetles, by providing habitat. Remove badly damaged leaves to discourage further feeding and improve the plant's appearance.
4. Sun scorch
Bergenia tolerates a wide range of conditions but performs best in part shade or dappled light. In full sun, particularly on free-draining soils during summer, the large leaves can scorch and curl as the plant struggles to replace the water it loses through the enormous leaf surface area. Scorched areas turn bleached, yellowish, or papery, and affected leaves roll at the margins to reduce the exposed surface.
What to look for
- Bleached or pale papery patches on leaf surfaces
- Leaf margins curling upward or inward in sunny weather
- Symptoms most severe on leaves facing directly into afternoon sun
- Soil drying out rapidly around the plant
- Damage worsening through summer and improving in autumn
How to fix it
Move bergenia to a position with morning sun and afternoon shade, or to full shade in very warm climates. Apply a generous layer of organic mulch to keep soil cool and moist. Water deeply during dry spells. If relocation is not possible, provide shade cloth protection during the hottest weeks. Scorched leaves do not recover but new growth replacing them in better conditions will be healthy.
5. Drought stress
Despite its tough reputation, bergenia needs adequate moisture, especially during hot summers and on light, free-draining soils. The large leaves transpire significant quantities of water and the plant can show leaf curl and wilting during extended dry periods. Container-grown bergenia is particularly vulnerable and can dry out rapidly during warm weather.
What to look for
- Leaves drooping and curling inward along their length
- Soil bone dry at depth when probed
- Leaves recovering slightly after watering but remaining somewhat curled
- Older, outer leaves most affected first
- Container plants drying out and showing symptoms within days in summer
How to fix it
Water deeply at the base of the plant during dry spells. Apply organic mulch to the soil surface to retain moisture. In shade gardens, bergenia often needs less supplemental watering than sun-grown plants because evaporation is reduced. For containers, use a moisture-retentive compost, add water-retaining gel crystals, and move pots to shade during the hottest weeks.
6. Root rot
Bergenia tolerates heavy clay soils but not permanently waterlogged ones. Prolonged saturation during winter encourages Phytophthora and crown rot pathogens. Affected plants show collapsing leaves that curl and yellow despite the soil being wet. The crown and roots smell musty or foul when examined, and the base of the plant may be discolored and soft.
What to look for
- Leaves curling and yellowing despite wet or waterlogged soil
- Plant failing to perk up despite watering
- Crown base soft, dark, or foul-smelling
- Root system thin and brown rather than firm and white
- Plant collapsing through winter in heavy, wet soils
How to fix it
Lift the plant and cut away all rotted crown and root material. Dust cuts with sulfur powder. Replant in improved conditions: raised beds, amended soil with added grit, or pots with excellent drainage. Bergenia in containers should never sit in a water-filled saucer. In heavy garden soils, mound the planting area slightly to encourage excess water to drain away from the crown.
Quick diagnosis checklist
| Symptom | Most likely cause | First action |
|---|---|---|
| Notched leaf margins, wilt with moist soil, grubs in roots | Vine weevil | Nematode drench, check roots, remove adults |
| Red/purple curl in winter, reverses in spring | Normal cold response | No action needed |
| Brown papery patches, curl after hard frost | Frost damage | Leave until spring, cut back damaged leaves |
| Ragged holes, slime trails, overnight damage | Slugs and snails | Iron phosphate pellets, hand pick |
| Bleached patches, margin curl in full sun | Sun scorch | Relocate to shade, mulch, water deeply |
| Curl with wet soil, mushy crown | Root rot | Lift, trim, improve drainage |
Frequently asked questions
Why are my bergenia leaves curling?
Bergenia leaves most often curl because of vine weevil larvae destroying the root system, frost or cold wind causing the large evergreen leaves to roll and redden, or slug damage eating into leaf margins. Check for the notched leaf edges that adult vine weevils cause, inspect roots for white grubs, and look for slime trails to narrow down the cause.
Why do bergenia leaves turn red and curl in winter?
Bergenia leaves naturally turn red, purple, or bronze in cold weather as the plant increases anthocyanin production to protect leaf cells from frost damage. Some curling during cold snaps is normal. Leaves should return to green and flatten as temperatures rise in spring. If curling persists into warm weather, check for vine weevil or root problems.
What does vine weevil damage look like on bergenia?
Adult vine weevils cut characteristic U-shaped notches into bergenia leaf margins, typically working at night. Larvae, which are the more serious problem, eat bergenia roots underground during late summer and autumn, causing plants to collapse, wilt, and show leaf curl despite moist soil. Lift affected plants to check for white C-shaped grubs at the roots.
Can sun scorch cause bergenia leaves to curl?
Yes. Although bergenia is tough, it performs best in part shade and can suffer leaf scorch and curling when grown in full sun on free-draining soils. Scorched leaves develop bleached, papery patches and curl at the margins. Move plants to a shadier spot or apply generous mulch to keep roots cool and moist.
How do I treat vine weevil on bergenia?
Apply a biological control nematode (Steinernema kraussei) to moist soil in late summer or early autumn when soil temperatures are above 5 C, targeting larvae before they grow large. For adult weevils, check under nearby pots and debris at night and remove them by hand. A systemic insecticide containing imidacloprid is a chemical option where permitted.