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Plant care

Hybrid mandevilla (Alice du Pont mandevilla) care

Mandevilla x amabilis

Also called Hybrid mandevilla, Alice du Pont mandevilla, Dipladenia.

RHS H1bUSDA 10-11Mildly toxic to petsIndoor 3–5 m (10–16 ft) as a climber

Watering rhythm

5-7days

Every 5–7 days in summer; every 10–14 days in winter

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Light

Bright indirect light (just back from a sunny window)

Soil

Well-draining, sandy or gritty loam-based compost

Humidity

50–70%

Temp

15–32°C

Pet safety

Mildly toxic to pets

Mature size

3–5 m (10–16 ft) as a climber

Care at a glance

Light

Bright but filtered. Hybrid mandevilla burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Thrives in bright, indirect light or morning direct sun with afternoon shade. In a conservatory or sunny windowsill, keep it back from the glass in summer to avoid scorch. Outdoors in warm climates, bright indirect to lightly dappled light is best. Too little light reduces flowering dramatically. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering hybrid mandevilla: every 5–7 days in summer; every 10–14 days in winter. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water thoroughly when the top 2–3 cm of compost begins to dry out. Allow excess water to drain freely — never allow the plant to stand in water. In winter, reduce watering considerably; slightly drier, cooler conditions help the plant rest and re-initiate flowering in spring. Soft or rainwater is preferred.

Soil and pot

Hybrid mandevilla grows best in well-draining, sandy or gritty loam-based compost. Prefers a free-draining compost — a mix of loam-based compost (John Innes No. 2 or 3) with added perlite or coarse sand (about 30%) prevents waterlogging. Slightly acidic to neutral pH 6.0–7.0. Repot in spring every 1–2 years. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Hybrid mandevilla sits happiest at around 50–70% humidity and 15–32°C (59–90°F). Prefers moderately high humidity. Mist foliage regularly in dry indoor environments or place on a pebble tray with water. Avoid misting flowers directly. Low humidity combined with dry heat causes leaf tip browning and bud drop. If you keep the room above 15–32°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed hybrid mandevilla sparingly. Feed every 2 weeks with a balanced liquid fertiliser (e.g., 10-10-10) during active growth from spring through early autumn. Reduce to monthly from autumn and stop feeding entirely during winter. A high-potassium feed in late summer encourages continued blooming. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on hybrid mandevilla in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Red spider mite — The most common pest under glass and indoors. Fine yellowing stippling and webbing on leaf undersides are the telltale signs. Raise humidity, mist regularly, and apply insecticidal soap or introduce Phytoseiulus persimilis as a biological control.
  • Bud drop — Caused by sudden temperature fluctuations, cold draughts, low humidity, or drastic changes in light. Maintain stable warm conditions (above 15°C/59°F), keep away from air-conditioning vents, and ensure consistent bright light.
  • Root rot from overwatering — Yellow leaves and wilting despite moist soil indicate root rot caused by poor drainage or overwatering. Allow compost to dry more between waterings, ensure the pot has ample drainage holes, and repot into fresh free-draining compost if roots are mushy.

Propagation

Take softwood or semi-ripe stem tip cuttings 10–15 cm (4–6 in) long in late spring or early summer. Remove the lower leaves, dip the cut end in rooting hormone, and root in a moist perlite-peat mix at 24–27°C (75–80°F) with high humidity in a propagator. Rooting takes 4–6 weeks. Wear gloves as the milky sap is a skin irritant. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Hybrid mandevilla is mildly toxic to pets. The ASPCA lists Mandevilla (sold as Dipladenia) as non-toxic to cats and dogs. Its milky sap can still cause mild mouth or stomach irritation if chewed, so keep it out of reach and contact your vet if a pet eats a large amount. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Hybrid mandevilla care — frequently asked questions

What is the common name for Mandevilla x amabilis?

Mandevilla x amabilis is most commonly called Hybrid mandevilla, but it is also known as Hybrid mandevilla, Alice du Pont mandevilla, Dipladenia. The names refer to the same species, so care instructions for Hybrid mandevilla apply identically to anything sold as Alice du Pont mandevilla.

How much light does hybrid mandevilla need?

Hybrid mandevilla grows best in bright indirect light (just back from a sunny window). Thrives in bright, indirect light or morning direct sun with afternoon shade. In a conservatory or sunny windowsill, keep it back from the glass in summer to avoid scorch. Outdoors in warm climates, bright indirect to lightly dappled light is best. Too little light reduces flowering dramatically.

How often should I water hybrid mandevilla?

Water hybrid mandevilla every 5–7 days in summer; every 10–14 days in winter. Water thoroughly when the top 2–3 cm of compost begins to dry out. Allow excess water to drain freely — never allow the plant to stand in water. In winter, reduce watering considerably; slightly drier, cooler conditions help the plant rest and re-initiate flowering in spring. Soft or rainwater is preferred. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is hybrid mandevilla toxic to cats and dogs?

Hybrid mandevilla is mildly toxic to pets. The ASPCA lists Mandevilla (sold as Dipladenia) as non-toxic to cats and dogs. Its milky sap can still cause mild mouth or stomach irritation if chewed, so keep it out of reach and contact your vet if a pet eats a large amount.

What USDA hardiness zone does hybrid mandevilla grow in?

Hybrid mandevilla is rated for USDA zone 10-11 and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Hybrid mandevilla deep-dive guides

Every aspect of hybrid mandevilla care, each with its own calibrated guide:

Featured in these plant shortlists

Hybrid mandevilla qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Hybrid mandevilla is also known as Hybrid mandevilla, Alice du Pont mandevilla, and Dipladenia.