Fertilising guide
How to fertilise Cross-leaved heath (Erica tetralix)— schedule & NPK
Also called Cross-leaved heath, Bog heather.
More about cross-leaved heath
About Cross-leaved heath
Erica tetralix · also called Cross-leaved heath, Bog heather · flowering
Cross-leaved heath is a low, spreading moorland shrub native to wet, boggy heathlands across western and northern Europe. It bears small clusters of pale rose-pink urn-shaped flowers at shoot tips from June to September, with grey-green leaves arranged in distinctive whorls of four. Unlike most heathers, it thrives in moist to wet, highly acidic conditions.
Growth habit: Low, straggly to mounded evergreen subshrub with hairy, grey-green leaves in whorls of four along slender stems. More open in habit than other heathers.
What fertiliser cross-leaved heath actually wants — and why
Cross-leaved heath 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 cross-leaved heath: 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 cross-leaved heath, 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 cross-leaved heath:
Apply a light dressing of ericaceous fertiliser or sulphate of ammonia in early spring. Feed sparingly — this species naturally grows in nutrient-poor boggy soils and does not respond well to rich feeding. Excess nitrogen encourages soft, disease-prone growth. 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 cross-leaved heath 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 cross-leaved heath
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for cross-leaved heath. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water cross-leaved heath first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cross-leaved heath watering schedule.
Signs you are over-feeding cross-leaved heath
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cross-leaved heath:
- 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 cross-leaved heath
- 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 cross-leaved heath care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush cross-leaved heath 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 cross-leaved heath
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 cross-leaved heath — frequently asked questions
What fertiliser does cross-leaved heath 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. Cross-leaved heath 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 cross-leaved heath?
Apply a light dressing of ericaceous fertiliser or sulphate of ammonia in early spring. Feed sparingly — this species naturally grows in nutrient-poor boggy soils and does not respond well to rich feeding. Excess nitrogen encourages soft, disease-prone growth. Apply a light dressing of ericaceous fertiliser or sulphate of ammonia in early spring. Feed sparingly — this species naturally grows in nutrient-poor boggy soils and does not respond well to rich feeding. Excess nitrogen encourages soft, disease-prone growth. 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 cross-leaved heath?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for cross-leaved heath. The variable that actually matters is pH, not concentration.
What does over-feeding cross-leaved heath 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 cross-leaved heath 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 cross-leaved heath?
Flush cross-leaved heath 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
- Cross-leaved heath care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cross-leaved heath — 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 knap hill scarlet quince
- How to fertilise rowallane quince
- How to fertilise pink lady flowering quince
- All 8452 fertilising guides in the Growli library