Plants
Desert Rose
Adenium obesum · Apocynaceae
The desert rose is one of the most spectacular succulents there is: above a bizarrely thickened, bottle-shaped trunk base — the caudex — it opens large funnel-shaped blooms in pink, red or white. It looks like a natural bonsai and, with good care, flowers for months. Important to know: its milky sap is highly poisonous, so it belongs out of reach of children and pets.
- Light
- Full sun — at least four to five hours of direct sun for a rich bloom.
- Watering
- Moderate in summer with complete drying in between, keep almost dry in winter.
- Care level
- Medium
- Botanical
- Adenium obesum
The caudex is the desert rose's trademark: a water reservoir that carries the plant through months of drought in its homeland. The older the specimen, the more sculptural the base — in Asia, adeniums have been bred for decades for bizarre caudex shapes and double flowers, and fine specimens fetch collector prices.
The flowers resemble oleander, to which the desert rose is closely related — both belong to the dogbane family. Modern varieties range from pure white through soft pink to deep velvet red, many with a pale throat or double petals. The main flush with us falls in spring and summer.
The desert rose is a devoted sun worshipper: the more direct sun it gets, the more compact it grows and the more richly it flowers. It is happiest at a south window or, in summer, outdoors in a sheltered spot safe from rain. In dark corners it etiolates and stops blooming.
The critical point is winter: as light levels fall, the desert rose often drops most of its leaves and enters a rest phase — that is normal and no cause for alarm. During this time water almost nothing at all; cold, wet substrate makes the caudex rot, and a rotten caudex is nearly impossible to save. A soft trunk base is always an alarm signal.
Always wear gloves when repotting and pruning: all parts of the plant carry a white latex containing cardiac glycosides that even served as arrow poison in its homeland. Clean your tools after cutting and dispose of trimmings safely — never leave them within reach of animals.
Is Desert Rose toxic to children and pets?
- Children
- Highly toxic
- Cats
- Highly toxic
- Dogs
- Highly toxic
All parts of the plant, especially the milky sap, contain cardiac glycosides and are highly toxic to cats, dogs and people — even small amounts can be dangerous. Keep it strictly out of reach of children and pets, and seek medical or veterinary help immediately if ingestion is suspected.
Typical symptoms: After ingestion: vomiting, diarrhoea, heavy drooling, cardiac arrhythmia, tremors, dilated pupils and lethargy up to circulatory failure. Skin contact with the sap can cause irritation.
In an emergency:call the German poison control centre in Bonn on +49 228 19240 (24/7) — for pets, contact an emergency vet directly. This information does not replace medical or veterinary advice.
Overview: toxic & non-toxic plants for cats, dogs and children
Care
- 01A full-sun spot at a south window; happy outdoors in summer, sheltered from rain.
- 02From spring to autumn water thoroughly, then let the substrate dry out completely.
- 03In winter keep it bright at 12–15 °C and water only enough to stop the caudex shrinking.
- 04Use a mineral, very free-draining substrate — waterlogging rots the caudex.
- 05Feed weakly every three to four weeks during the growing season.
- 06Wear gloves when pruning and repotting — the milky sap is highly poisonous.
Frequently asked
- How poisonous is the desert rose really?
- Very poisonous. The milky sap contains cardiac glycosides that were traditionally used as arrow poison in its African homeland. For cats, dogs and small children even nibbling can be dangerous. In households with pets or young children the desert rose should stand out of reach — or better, choose a non-toxic alternative.
- Why does my desert rose drop all its leaves in winter?
- That is its natural rhythm: with shorter days and cooler temperatures the desert rose retreats into a rest phase and sheds most of its foliage. Water almost nothing now and keep it bright — in spring it reliably sprouts again, often with flower buds straight away.
- Why is my desert rose not flowering?
- It is almost always lack of sun: without several hours of direct light, adenium hardly sets any buds. A missing winter rest or too much nitrogen-heavy fertiliser also holds back flowering. A full-sun spot, phosphorus-leaning feed and a cool, dry winter usually get it blooming again.
- Is a soft trunk on a desert rose a bad sign?
- Yes, that is an alarm signal. A healthy caudex feels plump and firm; if it turns soft, the roots or the storage trunk itself are rotting — usually after too much water in the cold. Unpot immediately, cut away rotten tissue generously, let the wounds dry and replant in fresh, dry substrate. The earlier you act, the better the odds.