Tree aeonium (Aeonium arboreum) care

Succulents & cacti · straightforward to keep

Last updated 26 October 2026

Tree aeonium (Aeonium arboreum) wants bright light, with sun through the cooler months. Water it every 10 days. Water when the top half of the pot is dry while it is growing, from autumn to spring. During its summer rest, water lightly and only now and then. Pot it in gritty cactus compost, at least half grit or perlite. A weak cactus feed two or three times over the summer, and repot every 2 years. Humidity: indifferent; dry air is ideal. Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested.

The tree aeonium: glossy rosettes of leaves on the ends of bare, branching stems, often sold in the near-black form 'Zwartkop'. It grows in the cool months and rests in summer, when the rosettes close up tight.

Quick facts

Water: Water every 10 days. Water when the top half of the pot is dry while it is growing, from autumn to spring. During its summer rest, water lightly and only now and then.
Light: Bright light, with sun through the cooler months.
Humidity: Indifferent; dry air is ideal.
Soil: Gritty cactus compost, at least half grit or perlite.
Feeding: A weak cactus feed two or three times over the summer.
Repotting: Repot every 2 years.
Toxic to pets: Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews.
Difficulty: Straightforward.
Mature size: 30–90 cm.
Native to: The Canary Islands.

Watering a Tree aeonium

Water every 10 days. Water when the top half of the pot is dry while it is growing, from autumn to spring. During its summer rest, water lightly and only now and then.

That cadence is the one PlantParlour sets for this species when you name it, and it is deliberately on the cautious side — a plant that asks a day early is safer than one that asks a day late. Log each watering and the reminder moves with the plant rather than with the calendar.

Light

Bright light, with direct sun from autumn to spring. Aeoniums grow in winter and rest in the summer heat, when the rosettes close up and drop leaves — that is normal, not dying.

Humidity and temperature

Indifferent; dry air is ideal. Central heating in winter is what turns a comfortable room into a dry one, and it is the usual reason an established plant suddenly browns at the edges or picks up spider mites.

Soil and potting

Cactus compost cut with more grit. A terracotta pot helps because it wicks water out of the mix and away from the roots.

Feeding

A weak cactus feed two or three times over the summer. Stop feeding in autumn and start again when you see new growth in spring — feeding a plant that isn't growing just builds up salts in the pot.

Repotting

Repot every 2 years. Every two or three years in spring, into a pot barely larger than the rosette.

Common problems

Stretched, pale, spaced-out leaves
Not enough light. This is not reversible.

Fix: Cut the head off, let it callus for a few days, and re-root it in full sun. The stump usually produces offsets.

Leggy, stretched growth: how to read it on any plant
Mushy translucent lower leaves
Overwatering.

Fix: Stop watering. Remove the affected leaves and let it dry out completely.
Shrivelled wrinkled leaves
Genuinely thirsty.

Fix: Water thoroughly and it plumps back up within a day or two.
White cottony blobs between the leaves
Mealybugs.

Fix: Alcohol on a cotton bud, every few days for a month — they hide deep in the rosette.

Propagation

Cut a rosette with a few centimetres of stem, let it callus for a few days, and root it in gritty compost.

A cutting taken in PlantParlour keeps its link to the plant it came from, so a propagation years later still traces back to the mother plant — which is the point if you ever sell or trade it.

Toxicity and safety

Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews.

If your pet has eaten a plant, call your vet, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661. Both are open around the clock and may charge a consultation fee. Take the plant or its label with you.

This is general information, not veterinary advice. We don't test plants: what we say about toxicity follows the ASPCA's published plant list as it stood on 26 October 2026, and that list can change. "Non-toxic" means not poisonous — a pet that eats enough of any plant can still vomit, and fertiliser, pesticide or leaf shine on a plant can harm it. It also only helps if the plant is what you think it is. It covers cats and dogs only; ask your vet about rabbits, birds, reptiles or anything else, and a doctor about children. Read our terms.

Every houseplant in the library the ASPCA lists as non-toxic to cats and dogs

Questions people ask

How often should you water a Tree aeonium?

Water every 10 days as a starting point — that is the cadence PlantParlour sets for Aeonium arboreum. Water when the top half of the pot is dry while it is growing, from autumn to spring. During its summer rest, water lightly and only now and then. Light, pot size and the time of year all move that number, so treat it as a reminder to go and check rather than a rule.

How much light does a Tree aeonium need?

Bright light, with direct sun from autumn to spring. Aeoniums grow in winter and rest in the summer heat, when the rosettes close up and drop leaves — that is normal, not dying.

Is Tree aeonium toxic to cats and dogs?

Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews. If a pet has eaten part of a plant, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 straight away.

How do you propagate a Tree aeonium?