Fertilising guide
How to fertilise Brazilian Jasmine (Mandevilla sanderi)— schedule & NPK
Also called Brazilian Jasmine, Dipladenia.
More about brazilian jasmine
About Brazilian Jasmine
Mandevilla sanderi · also called Brazilian Jasmine, Dipladenia · flowering
Brazilian jasmine, often sold as dipladenia, is a tender tropical plant with a bushier, more trailing habit than climbing mandevillas. It bears glossy leaves and showy trumpet flowers in pink, red or white throughout summer, ideal for pots, baskets and patios. Heat- and drought-tolerant once established, it must be overwintered frost-free in cool climates.
Growth habit: Bushy, mounding to trailing tender perennial, more compact than climbing mandevillas and well suited to pots and hanging baskets; can be lightly trained on a small support. Glossy leaves and red, pink or white trumpet flowers all summer. Milky latex sap exudes from cut stems. Trim to keep tidy and free-flowering.
Watch for — Cold sensitivity: Frost-tender and damaged below about 10°C. Move it indoors before autumn cold and overwinter frost-free; in spring cut back and resume feeding as growth restarts.
What fertiliser brazilian jasmine actually wants — and why
Brazilian Jasmine 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 brazilian jasmine: 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 brazilian jasmine, 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 brazilian jasmine:
Feed every 2 weeks in spring and summer with a high-potash or flowering fertiliser to keep blooms coming. Avoid heavy nitrogen, which favours foliage over flowers. Stop feeding in autumn and through winter while the plant rests in cool, frost-free storage. For a hungry bloomer that means feeding regularly — every 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 brazilian jasmine 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 brazilian jasmine
Follow the flowering-feed label rate for brazilian jasmine, 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 brazilian jasmine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the brazilian jasmine watering schedule.
Signs you are over-feeding brazilian jasmine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for brazilian jasmine:
- 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 brazilian jasmine
- 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 brazilian jasmine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown brazilian jasmine 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 brazilian jasmine
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 brazilian jasmine — frequently asked questions
What fertiliser does brazilian jasmine 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. Brazilian Jasmine 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 brazilian jasmine?
Feed every 2 weeks in spring and summer with a high-potash or flowering fertiliser to keep blooms coming. Avoid heavy nitrogen, which favours foliage over flowers. Stop feeding in autumn and through winter while the plant rests in cool, frost-free storage. Feed every 2 weeks in spring and summer with a high-potash or flowering fertiliser to keep blooms coming. Avoid heavy nitrogen, which favours foliage over flowers. Stop feeding in autumn and through winter while the plant rests in cool, frost-free storage. For a hungry bloomer that means feeding regularly — every 2 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for brazilian jasmine?
Follow the flowering-feed label rate for brazilian jasmine, 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 brazilian jasmine 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 brazilian jasmine 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 brazilian jasmine?
Container-grown brazilian jasmine 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
- Brazilian Jasmine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water brazilian jasmine — 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