Fertilising guide
How to fertilise Greater Celandine (Chelidonium majus)— schedule & NPK
Also called Greater Celandine, Tetterwort, Swallowwort, Common Celandine.
More about greater celandine
About Greater Celandine
Chelidonium majus · also called Greater Celandine, Tetterwort · herb
Greater Celandine is a short-lived European perennial herb in the poppy family, bearing bright yellow four-petalled flowers over soft, glaucous, pinnately lobed foliage from spring through autumn. The plant exudes distinctive orange-yellow latex sap used in traditional herbalism. It naturalises readily in hedgerows, walls, and shaded borders across temperate regions.
Growth habit: Short-lived, tap-rooted perennial or biennial; self-seeds prolifically to maintain a colony; semi-evergreen in mild climates
What fertiliser greater celandine actually wants — and why
Greater Celandine is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.
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 greater celandine: 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 greater celandine, 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 greater celandine:
Generally requires no supplemental fertilisation; thrives on average garden soil. On very impoverished ground, a light annual top-dress of balanced granular fertiliser in spring supports healthier growth. Avoid over-fertilising, which promotes excessive vegetative growth and prolific — sometimes undesirable — self-seeding. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
The dormant-season rule matters more than the exact interval: skip feeding entirely when greater celandine 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 greater celandine
Half strength is a sensible default for greater celandine — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
Feeding always goes onto already-damp soil, never dry roots — water greater celandine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the greater celandine watering schedule.
Signs you are over-feeding greater celandine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for greater celandine:
- Fast, soft, pale growth with diluted, less aromatic flavour.
- Early bolting (running to flower) and a bitter edge.
- Salt crust and scorched tips on container plants.
Signs you are under-feeding greater celandine
- Pale, slow regrowth after cutting and small leaves.
- A tired, stalled plant that cannot keep up with harvesting.
- Yellowing older leaves in a long-spent pot.
If the symptoms point at watering, light or roots rather than nutrition, the full greater celandine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Pot-grown greater celandine builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Organic vs synthetic feeds for greater celandine
Organic options
A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.
Synthetic / liquid feeds
A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.
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 greater celandine — frequently asked questions
What fertiliser does greater celandine need?
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Greater Celandine is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
How often should I feed greater celandine?
Generally requires no supplemental fertilisation; thrives on average garden soil. On very impoverished ground, a light annual top-dress of balanced granular fertiliser in spring supports healthier growth. Avoid over-fertilising, which promotes excessive vegetative growth and prolific — sometimes undesirable — self-seeding. Generally requires no supplemental fertilisation; thrives on average garden soil. On very impoverished ground, a light annual top-dress of balanced granular fertiliser in spring supports healthier growth. Avoid over-fertilising, which promotes excessive vegetative growth and prolific — sometimes undesirable — self-seeding. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
What strength of feed for greater celandine?
Half strength is a sensible default for greater celandine — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
What does over-feeding greater celandine look like?
Fast, soft, pale growth with diluted, less aromatic flavour. Early bolting (running to flower) and a bitter edge. Salt crust and scorched tips on container plants. Over-feeding greater celandine with strong nitrogen is the usual mistake — it grows fast and lush but the leaves turn bland and it bolts to flower sooner, ending the useful harvest early.
Should I flush the soil of greater celandine?
Pot-grown greater celandine builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Keep reading
- Greater Celandine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water greater celandine — 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 syrian oregano
- How to fertilise dittany of crete
- How to fertilise barbecue rosemary
- All 8452 fertilising guides in the Growli library