Fertilising guide
How to fertilise Common Jasmine (Jasminum officinale)— schedule & NPK
Also called Poet's Jasmine, Summer Jasmine.
More about common jasmine
About Common Jasmine
Jasminum officinale · also called Poet's Jasmine, Summer Jasmine · flowering
Common jasmine is a vigorous semi-evergreen to deciduous twining climber bearing clusters of small, star-shaped, intensely fragrant white flowers through summer and into autumn. A classic for sunny walls, pergolas and arbours, it scrambles to 6-9 metres on supports. It is reliably hardy in temperate gardens and easy to grow in any fertile, well-drained soil.
Growth habit: Twining, vigorous semi-evergreen climber that needs wires, trellis or a framework to scramble over; not self-clinging. Produces loose cymes of fragrant white (pink-budded) flowers from June to autumn. Responds to pruning after flowering to keep it within bounds and flowering well.
Watch for — Few or no flowers: Caused by too much shade, hard or mistimed pruning that removes flowering wood, or excess nitrogen. Site in full sun, prune right after flowering, and use a high-potash feed.
What fertiliser common jasmine actually wants — and why
Common 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 common 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 common 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 common jasmine:
Feed in spring with a balanced general fertiliser, and apply a high-potash feed (such as a rose or tomato feed) through the flowering season to encourage blooms. Mulch in spring. Avoid heavy nitrogen, which promotes foliage over flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — 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 common 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 common jasmine
Follow the flowering-feed label rate for common 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 common jasmine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the common jasmine watering schedule.
Signs you are over-feeding common jasmine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for common 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 common 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 common jasmine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown common 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 common 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 common jasmine — frequently asked questions
What fertiliser does common 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. Common 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 common jasmine?
Feed in spring with a balanced general fertiliser, and apply a high-potash feed (such as a rose or tomato feed) through the flowering season to encourage blooms. Mulch in spring. Avoid heavy nitrogen, which promotes foliage over flowers. Feed in spring with a balanced general fertiliser, and apply a high-potash feed (such as a rose or tomato feed) through the flowering season to encourage blooms. Mulch in spring. Avoid heavy nitrogen, which promotes foliage over flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for common jasmine?
Follow the flowering-feed label rate for common 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 common 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 common 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 common jasmine?
Container-grown common 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
- Common Jasmine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water common 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