Fertilising guide
How to fertilise Corsican Heath (Erica terminalis)— schedule & NPK
Also called Corsican Heath, Corsican Heather, Terminal Heath.
More about corsican heath
About Corsican Heath
Erica terminalis · also called Corsican Heath, Corsican Heather · flowering
A bushy, erect evergreen shrub native to Corsica, Sardinia, southern Spain, Italy, and Morocco, and long naturalised in parts of Northern Ireland, where it grows in rocky, sun-drenched scrubland on calcareous soils. It is distinctive for its terminal clusters of rose-pink, urn-shaped flowers produced in summer and early autumn, and for its persistent rusty-brown faded flowers that remain attractive through winter. Like Erica multiflora, it tolerates alkaline soils, making it valuable for lime-rich gardens. The most important care point is to site it in a warm, sheltered, freely draining position, as it is less cold-hardy than the mountain ericas. Erica terminalis is not confirmed by ASPCA as toxic or non-toxic; classified mildly-toxic as a precaution.
Growth habit: Bushy, erect, well-branched evergreen shrub with mid-green needle-like foliage in whorls.
What fertiliser corsican heath actually wants — and why
Corsican 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 corsican 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 corsican 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 corsican heath:
Apply a light balanced or ericaceous fertiliser in early spring; avoid feeding in late summer or autumn as this stimulates soft growth susceptible to frost damage. 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 corsican 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 corsican heath
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for corsican heath. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water corsican heath first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the corsican heath watering schedule.
Signs you are over-feeding corsican heath
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for corsican 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 corsican 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 corsican heath care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush corsican 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 corsican 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 corsican heath — frequently asked questions
What fertiliser does corsican 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. Corsican 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 corsican heath?
Apply a light balanced or ericaceous fertiliser in early spring; avoid feeding in late summer or autumn as this stimulates soft growth susceptible to frost damage. Apply a light balanced or ericaceous fertiliser in early spring; avoid feeding in late summer or autumn as this stimulates soft growth susceptible to frost damage. 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 corsican heath?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for corsican heath. The variable that actually matters is pH, not concentration.
What does over-feeding corsican 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 corsican 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 corsican heath?
Flush corsican 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
- Corsican Heath care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water corsican 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 stribrny's saxifrage
- How to fertilise farrer's gentian
- How to fertilise new zealand gentian
- All 10153 fertilising guides in the Growli library