Fertilising guide
How to fertilise Day-blooming Jasmine (Cestrum diurnum)— schedule & NPK
Also called Day-blooming Jasmine, Day Jessamine, King of the Day, White Chocolate Jasmine.
More about day-blooming jasmine
About Day-blooming Jasmine
Cestrum diurnum · also called Day-blooming Jasmine, Day Jessamine · tropical
Day-blooming Jasmine is a fast-growing evergreen shrub in the nightshade family that bears clusters of white tubular flowers with a sweet vanilla-like scent during daylight hours — the daytime counterpart to Cestrum nocturnum. It thrives in full sun to part shade and moist, well-draining soil. All parts are severely toxic, particularly the berries, and the plant is invasive in some regions.
Growth habit: Upright, evergreen shrub or small multi-stemmed tree
What fertiliser day-blooming jasmine actually wants — and why
Day-blooming Jasmine is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 day-blooming 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 day-blooming 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 day-blooming jasmine:
Apply a balanced slow-release granular fertiliser at the start of the growing season in spring. Supplement with monthly liquid feeding through summer using a bloom formula to sustain continuous flowering. Reduce feeding to once at the start of spring only for established in-ground plants in warm climates where growth is near-continuous. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when day-blooming 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 day-blooming jasmine
Half strength is the safe default for day-blooming jasmine — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water day-blooming jasmine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the day-blooming jasmine watering schedule.
Signs you are over-feeding day-blooming jasmine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for day-blooming jasmine:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding day-blooming jasmine
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full day-blooming jasmine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of day-blooming jasmine with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for day-blooming jasmine
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 day-blooming jasmine — frequently asked questions
What fertiliser does day-blooming jasmine need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Day-blooming Jasmine is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed day-blooming jasmine?
Apply a balanced slow-release granular fertiliser at the start of the growing season in spring. Supplement with monthly liquid feeding through summer using a bloom formula to sustain continuous flowering. Reduce feeding to once at the start of spring only for established in-ground plants in warm climates where growth is near-continuous. Apply a balanced slow-release granular fertiliser at the start of the growing season in spring. Supplement with monthly liquid feeding through summer using a bloom formula to sustain continuous flowering. Reduce feeding to once at the start of spring only for established in-ground plants in warm climates where growth is near-continuous. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for day-blooming jasmine?
Half strength is the safe default for day-blooming jasmine — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding day-blooming jasmine look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding day-blooming jasmine year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of day-blooming jasmine?
Flush the pot of day-blooming jasmine with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Day-blooming Jasmine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water day-blooming 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 mombasa cycad
- How to fertilise cameroon cycad
- How to fertilise barter's cycad
- All 6887 fertilising guides in the Growli library