Mandevilla care guide
Mandevilla sanderi
Quick answer
Water your Mandevilla when the top 3 cm (1.2 in) of soil feel dry. In summer that’s typically every 6 to 8 days.
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- Light
- Bright light, some sun
- Typical interval
- Every 6 to 8 days · summer
Every 11 to 17 days · winter - Climate
- 15–29 °C (59–84 °F)
- Humidity
- 50–70%
- Pet safety
- Toxic to cats and dogs
When and how to water
3 cm (1.2 in)
- Summer · Jun–AugEvery 6 to 8 days
- Winter · Dec–FebEvery 11 to 17 days
Use room-temperature water and let any excess drain. Never leave the pot sitting in standing water.
Adjust the timing for the light at the plant, the pot’s size and material, and the humidity indoors. Terracotta dries faster than glazed ceramic.
Light and placement
Bright light, some sun
Mandevilla needs bright light and a little gentle direct sun, such as morning sun. Strong midday sun can scorch the leaves. Place it close to an east- or west-facing window.
Feeding
Feed your Mandevilla every 30 days while it’s actively growing. Use a balanced liquid houseplant fertilizer at half the strength on the label, and only on soil that’s already damp. Feeding dry roots can scorch them.
When growth pauses, skip the fertilizer and let it rest.
Temperature & humidity
Climate15–29 °C (59–84 °F)
Humidity50–70%
During leafy growth, aim for 15–29 °C (59–84 °F). For routine indoor care, keep it above about 10 °C (50 °F) and avoid cold drafts. This is a care guideline, not an exact damage threshold. Cooler overwintering depends on the species and its rest conditions.
It does best at 50–70% humidity. It doesn’t need misting.
Overwintering mandevilla (dipladenia)
Bring mandevilla indoors before nights drop below 10 to 15 °C (50–59 °F) and keep it bright, ideally above 15 °C (59 °F) at night and never below 10 °C (50 °F). In a cooler room it drops leaves and rests, which is normal.
Toxic to pets?
Yes. Keep it out of reach.
Wear gloves when you cut or repot it. Keep the sap away from your eyes and skin, and wash your hands afterwards.
Pet-safety information in the JungleBook uses University of Zurich CliniTox where available. It is reference information, not veterinary advice. University of Zurich CliniTox classifies Mandevilla sanderi as mildly toxic. Its cat and dog vomiting reports identify Mandevilla, without confirming the species.
Pet-safe alternatives with similar light
Common questions
How often should I water a Mandevilla?
Water your Mandevilla (Mandevilla sanderi) when the top 3 cm (1.2 in) of soil feel dry. In summer, that’s typically every 6 to 8 days. In winter, slow down to every 11 to 17 days.
Sources4 references
- Royal Botanic Gardens, Kew: Plants of the World OnlineTaxonomy · accepted name · synonym · native range · climbing habit
- Royal Horticultural SocietyIndoor light · temperature · humidity · watering · feeding · compost · repotting · pests
- North Carolina State University Extension Gardener Plant ToolboxIndoor bright indirect light · room temperature · humidity · moisture · drainage · cold sensitivity
- University of Florida IFAS ExtensionCultivar identity · full sun · watering · fertilizing · pests · cold sensitivity · sap
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