Aubrieta (also spelled aubretia in the traditional British way) is one of the most cheerful plants a UK garden can have. Each April and May it buries itself in small flowers in shades of pale lavender, mauve, bright pink, and deep magenta, before settling into a dense grey-green mat for the rest of the year. It is completely hardy, asks almost nothing of its soil beyond good drainage, and is perfectly at home cascading over a dry stone wall or spreading across a rockery. When the leaves start to curl, distort, or look tatty, something has gone wrong with one of that short list of needs.
Most cases of leaf curling in aubrieta come down to two things: flea beetle damage, or the long-term consequences of skipping the post-flowering cut-back. A smaller number of cases involve fungal problems, aphids, or root damage. Working out which one you have is straightforward once you know what to look for.
Flea beetle damage (Phyllotreta species)
Aubrieta belongs to the Brassicaceae family, the same family as cabbages, wallflowers, and stocks. That family membership makes it a target for flea beetles, the tiny metallic jumping insects (Phyllotreta species) that are a familiar sight on vegetable patches in late spring. The beetles chew small, irregular holes through the leaves. The leaf tissue around each hole dries out and contracts, pulling the leaf margins inward into a curl. From a distance the plant looks scorched or tatty rather than obviously holed, and the damage can easily be mistaken for drought stress or disease.
The problem is worst in spring and early summer, especially during dry spells. Dry soil stresses the plants and slows their growth, giving the beetles more time to damage any given area of leaf before the plant can grow through it. Seedlings and freshly divided young plants are particularly vulnerable because they have a small root system and limited reserves. Plants that have just been cut back hard after flowering are also at risk: the flush of soft new growth that emerges in late May and June is exactly what flea beetles find most attractive.
To confirm flea beetle, crouch down and disturb the plant. The beetles will leap away from the leaves in small metallic flashes. They are roughly 2mm long, dark, and shiny.
Control is straightforward. Water thoroughly during dry periods to keep the plants growing strongly. Cover vulnerable new plants, divisions, or freshly cut-back mats with fine insect-proof mesh or horticultural fleece in late spring, removing it once the plants have put on a few centimetres of new growth. Insecticidal soap sprays will kill beetles they contact directly, but flea beetles are fast and the spray must hit them rather than just coat the leaves; repeat applications are usually needed. Established plants in open, freely draining positions often grow through a moderate attack with minimal permanent damage.
Failure to cut back after flowering
This is the most common cause of a gradually deteriorating aubrieta and the one most often mistaken for disease. Aubrieta is a sub-shrub at heart: without pruning it becomes progressively woodier each year, the centre of the mat becomes congested and airless, and the inner leaves lose access to light. They yellow, dry out, and curl. The outer edges of the mat continue to flower well, so the plant may still look attractive in spring, but the browning, curled mess at the centre reveals that it is in decline.
The fix is simple: cut the whole plant back hard with shears immediately after flowering in May or early June, reducing it to a few centimetres above the ground. This feels brutal, but aubrieta responds with a flush of fresh, compact growth from the base. Done every year, this single action keeps the plant young and healthy almost indefinitely. Plants that have been neglected for three or four years can usually still be rescued by a hard cut, but plants neglected for much longer may not regenerate from the woody base at all. If the centre does not re-shoot within six weeks, take cuttings from any green outer growth and use them to raise new plants, then discard the parent.
The best time to take those cuttings is immediately after you make the hard cut, in June. Short shoots of non-flowering growth root readily in a gritty compost and will be ready to pot on by late summer. Keeping a rolling supply of young plants means you always have something to fill a gap if an old plant finally gives up.
Other causes
Downy mildew (caused by Peronospora species) produces curling, yellowing leaves with a distinctive grey or pale purple furry coating on the underside. It appears most often in cool, damp autumn weather, or where plants are growing in a sheltered spot without enough air movement. Remove affected growth and, if possible, move the plant to a more open position. Aubrieta in a fully exposed, free-draining spot rarely suffers from mildew.
Aphids congregating on shoot tips in spring cause the young leaves to distort and curl inward as they expand. Soft colonies of green or grey aphids are visible on close inspection. A firm jet of water knocks most of them off; insecticidal soap is effective for persistent infestations. Established mats with good air circulation are rarely badly affected.
Vine weevil grubs can eat through the roots of old, congested plants growing in containers or in heavy soil. The above-ground symptom is a plant that wilts and then collapses section by section, with leaves curling as each part loses its root system. Lift the plant and check for the characteristic C-shaped cream grubs in the soil around the roots. Biological control with Steinernema kraussei nematodes, applied to moist soil in late summer or early autumn, is the most reliable treatment in containers.
Drought stress in containers or on very porous chalk soils can cause leaf roll without any pest or disease involvement. Aubrieta is drought tolerant in the ground but containers dry out fast in summer. Water container-grown plants regularly and consider mulching around plants in exposed rockery positions. Over-watering a container-grown plant is equally damaging: waterlogged roots rot, the plant cannot take up water or nutrients, and the leaves curl and yellow in a way that looks superficially like drought.
Clubroot (Plasmodiophora brassicae) is theoretically possible given aubrieta's family membership, but it is very rarely reported in practice. If you have had clubroot problems on brassicas in the same soil, it is worth planting aubrieta in a raised bed or container with fresh compost rather than directly in infected ground.
Prevention
Aubrieta is genuinely low maintenance, but a small amount of attention at the right time makes the difference between a plant that thrives for decades and one that slowly declines. Cut back hard after every flowering without exception. Plant in very free-draining soil in full sun; aubrieta has a slight preference for alkaline or neutral soil and performs particularly well in the lime-rich mortar of old stone walls. Protect new growth, divisions, and freshly cut-back mats from flea beetle with fine insect-proof mesh in late spring. Divide or replace plants every three to four years if they are growing in borders, before the centre has a chance to die out. Take cuttings annually after the post-flowering cut so you always have young plants available to replace tired ones.
In the garden, aubrieta is outstanding when combined with Arabis caucasica for white, Aurinia saxatilis for yellow, and Phlox subulata for pink. The classic spring rockery planting that results is one of the most reliable and low-effort displays in British horticulture. Reliable compact cultivars worth seeking out include 'Bressingham Pink' and 'Red Cascade'. With annual cutting back and the occasional division, plants in a well-chosen spot will reward you with a carpet of colour for many years.
Frequently asked questions
When and how should I cut back aubrieta?
Cut aubrieta back hard every year in May or early June, immediately after the flowers fade. Use shears to trim the whole plant down to a few centimetres above the ground. This prevents the woody, congested centre that causes leaf curling and die-back, and stimulates a fresh flush of compact leafy growth in time for the following spring.
Can aubrieta really grow in a dry stone wall?
Yes. Aubrieta is one of the best plants for dry stone walls and will naturalise in the mortar joints without any help. Plant young divisions or plug plants into gaps in the wall in spring or autumn, or simply scatter seed into the crevices. The sharp drainage and alkaline lime mortar suit it perfectly.
What are the tiny holes in my aubrieta leaves?
Tiny round or irregular holes in aubrieta leaves are the hallmark of flea beetle (Phyllotreta species). These small metallic jumping beetles feed on members of the Brassicaceae family, which includes aubrieta. The leaf margins curl inward around the damaged areas. Keep the soil moist during dry spells to help plants outgrow the attack, and cover vulnerable young plants with fine insect-proof mesh.
Why is the centre of my aubrieta mat dying out?
A dying centre with brown, curled leaves and vigorous flowering edges is the classic sign that aubrieta has not been cut back for several years. The plant becomes progressively woody; the outer growth continues to flower well, but the congested centre cannot produce healthy leaves. Cut back the whole mat hard immediately after flowering. If the plant has been neglected for many years it may not regenerate fully, so take cuttings from the healthy outer growth and replace the parent plant.
My aubrieta leaves are curling and have a grey fuzzy coating underneath. What is it?
A grey or pale purple furry coating on the underside of curling, yellowing leaves points to downy mildew, caused by Peronospora species. It appears most often in cool, damp autumns or where plants are in a sheltered spot with poor air circulation. Remove affected growth, improve drainage, and avoid overhead watering. Plants in very exposed, free-draining positions rarely suffer from this problem.