Why Are My Aeonium Leaves Curling?

Summer dormancy (normal behaviour)

This is by far the most common reason UK gardeners worry about their aeoniums. In summer, when temperatures rise and day length increases, aeonium enters a natural dormancy period. The rosettes close inward, the lower leaves dry up and fall, the stems become more woody, and the plant may look half dead compared to its lush winter form. This is entirely normal and is not a sign of a problem.

Aeonium is a cool-season grower adapted to Mediterranean winters with mild, wet conditions. It does the opposite of most succulents: growing vigorously from autumn to spring and resting through the hottest months. If your aeonium is closing up in June, July, or August, and the stems still feel firm and healthy, no action is needed.

What to do

• Reduce watering dramatically in summer: potted plants may need watering only once or twice in a whole summer. Outdoor plants in the ground usually need nothing at all.
• Do not move the plant to a cooler spot or try to force growth in summer: this is its natural rest phase and it is healthiest when left alone.
• Resume regular watering in early to mid-autumn as temperatures drop and the plant naturally reopens and begins to grow again.

Underwatering during the growing season

Outside of the summer dormancy period (from roughly late September through May), aeonium is actively growing and has genuine water requirements. If the compost dries out completely for extended periods during this time, the rosettes close more tightly than expected for summer dormancy and the outer leaves may feel thin, slightly rubbery, or begin to shrivel rather than simply drying and dropping naturally.

The distinction from summer dormancy is timing: if the rosettes are closing in October, November, or through winter and early spring, it is not normal seasonal behaviour and the compost should be checked.

What to do

• During the growing season, water when the top half of the compost has dried out, then water thoroughly and allow to drain completely.
• Outdoor plants in the ground may need supplementary watering during dry spells in autumn and spring.
• Potted plants on covered patios or in conservatories often miss rainfall entirely and need more regular monitoring than plants in open beds.

Overwatering and root rot

Overwatering is particularly destructive when it happens during summer dormancy, when the plant is not actively taking up water. Roots sitting in wet compost through the summer months quickly rot, and by the time autumn comes and the plant should be reopening and growing again, the root system may be too damaged to support it. Leaves that curl, yellow, and become soft and translucent rather than drying naturally are a sign of rot rather than normal dormancy.

During the growing season, overwatering in compost that does not drain well has similar effects: the roots rot and the plant cannot absorb water, causing leaves to curl and drop despite the wet compost.

What to do

• In summer, stop watering almost entirely. A single light watering per month at most for potted plants in extreme heat; none for outdoor plants unless there has been no rain for six or more weeks.
• If root rot is suspected, unpot the plant, cut away any dark, mushy roots, let it air-dry for 24 hours, and repot in fresh gritty compost.
• Ensure all pots have drainage holes and never leave aeonium sitting in standing water at any time of year.

Frost damage

Aeonium is frost-tender. Most species are damaged by temperatures below about minus 2 to minus 4 degrees Celsius, and even milder frosts can harm the soft growing tips and young leaves of actively growing rosettes in autumn and winter. Frost-damaged leaves become pale, translucent, and water-soaked in appearance before collapsing. If only the tips of the rosette are affected, the plant may recover as the damaged tissue dries; if the entire growing point is frosted, that stem or branch will not recover.

What to do

• In most of the UK, move potted aeoniums under cover before the first frost in autumn, typically by October.
• In mild coastal areas where the plant can remain outdoors, cover it with horticultural fleece during cold snaps.
• Remove frost-damaged leaves and any collapsed rosette tips. The plant will often produce new side shoots from the stem below the damaged point.
• Do not water frost-damaged plants until they show signs of new growth and temperatures are reliably above freezing.

Spider mite in warm weather

Spider mites thrive in hot, dry conditions and can attack aeonium during warm summers, particularly plants kept indoors or in a conservatory. Infested leaves develop a stippled or finely speckled appearance as the mites puncture individual cells, and in heavier infestations the leaves curl and fine webbing becomes visible between the leaves and on the undersides. The damage looks superficially similar to summer dormancy stress, so checking for webbing and the tiny mites with a magnifying glass is important if damage seems excessive.

What to do

• Increase humidity around the plant and improve air circulation, as spider mites dislike moist, moving air.
• Spray the plant thoroughly with water to dislodge mites, then follow up with a spray of diluted neem oil or insecticidal soap, covering both leaf surfaces.
• Repeat every five to seven days for three to four weeks to break the mite life cycle.
• Moving the plant outdoors in summer (to a sheltered spot with indirect light) often resolves spider mite problems naturally, as outdoor conditions are less favourable to them.

Frequently asked questions

Why are my aeonium rosettes closing up?

Aeonium rosettes closing or curling inward in summer is a completely normal response to heat and drought. Unlike most succulents, aeonium is a winter grower that goes dormant in summer. The rosettes close to reduce water loss and the plant may drop some lower leaves. This is not a problem and requires no action.

How often should I water aeonium?

During the active growing season from autumn through spring, water when the top half of the compost has dried out. In summer dormancy, reduce watering to almost nothing: once or twice over the whole summer is usually sufficient for potted plants. Outdoor plants in the ground often need no summer watering at all.

Can aeonium survive a UK winter outdoors?

Aeonium is frost-tender and is not reliably hardy across most of the UK. It survives outdoors year-round in very mild coastal areas such as Cornwall, the Isles of Scilly, and sheltered parts of Devon. In most of the UK, plants in pots should be brought indoors before the first frost.

Why are my aeonium leaves curling and dropping in winter?

Leaf curling and dropping in winter usually indicates overwatering or cold damage. Aeonium is actively growing in winter and needs some water, but sitting in waterlogged compost causes root rot. Cold damage from frost or draughts causes the leaves to become translucent and collapse.