Fertilising guide
How to fertilise Mandevilla 'Alice du Pont' (Mandevilla x amabilis 'Alice du Pont')— schedule & NPK
Also called Pink Mandevilla, Rocktrumpet.
More about mandevilla 'alice du pont'
About Mandevilla 'Alice du Pont'
Mandevilla x amabilis 'Alice du Pont' · also called Pink Mandevilla, Rocktrumpet · flowering
'Alice du Pont' is a vigorous tropical twining vine grown for its large, glossy leaves and trumpet-shaped rose-pink flowers borne all summer. A tender perennial in cool climates, it is treated as a patio container plant or annual and overwintered frost-free. It loves heat, sun and humidity, climbing 3-6 metres on a trellis in a single season.
Growth habit: Vigorous twining tropical climber that needs a trellis, obelisk or wires to scramble up; not self-clinging. Large oval glossy leaves and showy 7-10 cm rose-pink trumpet flowers all summer. Stems exude milky latex when cut. Prune in late winter/early spring to shape and encourage branching.
Watch for — Poor flowering: Too little light or over-feeding with nitrogen produces foliage but few blooms. Give full sun, feed with a high-potash fertiliser, and ensure warm conditions for the flush to continue.
What fertiliser mandevilla 'alice du pont' actually wants — and why
Mandevilla 'Alice du Pont' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for mandevilla 'alice du pont': match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed mandevilla 'alice du pont', and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For mandevilla 'alice du pont':
Feed every 1-2 weeks through spring and summer with a high-potash or bloom-boosting fertiliser to sustain continuous flowering. Avoid excess nitrogen, which favours leaves over flowers. Stop feeding in autumn and winter when the plant is overwintered cool and growth halts. For a hungry bloomer that means feeding regularly — every 1-2 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
The dormant-season rule matters more than the exact interval: skip feeding entirely when mandevilla 'alice du pont' is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for mandevilla 'alice du pont'
Follow the flowering-feed label rate for mandevilla 'alice du pont', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
Feeding always goes onto already-damp soil, never dry roots — water mandevilla 'alice du pont' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mandevilla 'alice du pont' watering schedule.
Signs you are over-feeding mandevilla 'alice du pont'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mandevilla 'alice du pont':
- Lots of lush leaves but few flowers (too much nitrogen).
- Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
- Soft, sappy growth prone to aphids and mildew.
Signs you are under-feeding mandevilla 'alice du pont'
- Sparse, small, short-lived flowers and pale foliage.
- A tired plant that stops blooming early in the season.
- Weak growth and poor repeat-flowering after the first flush.
If the symptoms point at watering, light or roots rather than nutrition, the full mandevilla 'alice du pont' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown mandevilla 'alice du pont' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Organic vs synthetic feeds for mandevilla 'alice du pont'
Organic options
A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.
Synthetic / liquid feeds
A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising mandevilla 'alice du pont' — frequently asked questions
What fertiliser does mandevilla 'alice du pont' need?
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Mandevilla 'Alice du Pont' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
How often should I feed mandevilla 'alice du pont'?
Feed every 1-2 weeks through spring and summer with a high-potash or bloom-boosting fertiliser to sustain continuous flowering. Avoid excess nitrogen, which favours leaves over flowers. Stop feeding in autumn and winter when the plant is overwintered cool and growth halts. Feed every 1-2 weeks through spring and summer with a high-potash or bloom-boosting fertiliser to sustain continuous flowering. Avoid excess nitrogen, which favours leaves over flowers. Stop feeding in autumn and winter when the plant is overwintered cool and growth halts. For a hungry bloomer that means feeding regularly — every 1-2 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for mandevilla 'alice du pont'?
Follow the flowering-feed label rate for mandevilla 'alice du pont', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
What does over-feeding mandevilla 'alice du pont' look like?
Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on mandevilla 'alice du pont' is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.
Should I flush the soil of mandevilla 'alice du pont'?
Container-grown mandevilla 'alice du pont' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Keep reading
- Mandevilla 'Alice du Pont' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water mandevilla 'alice du pont' — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 1284 fertilising guides in the Growli library