Fertilising guide
How to fertilise White Ixora (Ixora finlaysoniana)— schedule & NPK
Also called White Ixora, Finlayson's Ixora, White Jungle Flame.
More about white ixora
About White Ixora
Ixora finlaysoniana · also called White Ixora, Finlayson's Ixora · tropical
White Ixora is a large tropical shrub from Southeast Asia producing dense clusters of fragrant white flowers. It thrives in full sun with consistently moist, acidic soil and high humidity. Excellent as a specimen shrub or informal hedge in frost-free gardens; container-grown plants do well on bright patios in temperate climates.
Growth habit: Upright, multi-branched evergreen shrub
Watch for — Scale insects and sooty mold: Soft scale and mealybugs colonise stems and leaf axils, secreting honeydew that leads to black sooty mold. Treat with horticultural oil or neem oil; improve air circulation and avoid over-fertilising with nitrogen.
What fertiliser white ixora actually wants — and why
White Ixora is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.
An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves.
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 white ixora: 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 white ixora, 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 white ixora:
Feed with an acidic, slow-release fertiliser (e.g., azalea/camellia formulation) every 6-8 weeks during the growing season (spring through autumn). Supplement with foliar iron chelate if yellowing between leaf veins indicates iron deficiency. Avoid feeding in winter. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.
The dormant-season rule matters more than the exact interval: skip feeding entirely when white ixora 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 white ixora
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for white ixora. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water white ixora first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the white ixora watering schedule.
Signs you are over-feeding white ixora
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for white ixora:
- Brown, scorched leaf margins from too strong or too frequent a dose.
- White salt crust on the soil surface.
- Soft, lush growth that fruits or flowers poorly.
Signs you are under-feeding white ixora
- Yellowing leaves with green veins (iron chlorosis from high pH).
- Weak growth, poor cropping and an overall pale, stressed look.
- Stunted new shoots in spring despite adequate water and light.
If the symptoms point at watering, light or roots rather than nutrition, the full white ixora care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush white ixora with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.
Organic vs synthetic feeds for white ixora
Organic options
Composted pine bark, pine-needle mulch, used coffee grounds and an organic ericaceous feed gently maintain acidity. UK: Vitax or Westland Ericaceous; US: Espoma Holly-tone or Dr. Earth Acid Lovers. Slow, soil-improving, hard to overdo.
Synthetic / liquid feeds
A liquid or granular ericaceous feed — UK: Miracle-Gro Ericaceous, Vitax or Westland; US: Miracle-Gro Acid-Loving Plant Food or Espoma Holly-tone. Pair with rainwater and an acidic mulch for it to work.
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 white ixora — frequently asked questions
What fertiliser does white ixora need?
An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves. White Ixora is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.
How often should I feed white ixora?
Feed with an acidic, slow-release fertiliser (e.g., azalea/camellia formulation) every 6-8 weeks during the growing season (spring through autumn). Supplement with foliar iron chelate if yellowing between leaf veins indicates iron deficiency. Avoid feeding in winter. Feed with an acidic, slow-release fertiliser (e.g., azalea/camellia formulation) every 6-8 weeks during the growing season (spring through autumn). Supplement with foliar iron chelate if yellowing between leaf veins indicates iron deficiency. Avoid feeding in winter. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.
What strength of feed for white ixora?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for white ixora. The variable that actually matters is pH, not concentration.
What does over-feeding white ixora look like?
Brown, scorched leaf margins from too strong or too frequent a dose. White salt crust on the soil surface. Soft, lush growth that fruits or flowers poorly. Feeding white ixora an ordinary fertiliser, or growing it in hard tap water / limey soil, is the defining mistake — it triggers lime-induced chlorosis (yellow leaves, green veins) no amount of feeding fixes until the pH comes down.
Should I flush the soil of white ixora?
Flush white ixora with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.
Keep reading
- White Ixora care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water white ixora — 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 dwarf sugar palm
- How to fertilise buccaneer palm
- How to fertilise spindle palm
- All 6887 fertilising guides in the Growli library