Fertilising guide
How to fertilise Curly Parsley (Petroselinum crispum var. crispum)— schedule & NPK
Also called curly parsley, common parsley, garnish parsley.
More about curly parsley
About Curly Parsley
Petroselinum crispum var. crispum · also called curly parsley, common parsley · herb
Curly parsley is a hardy biennial culinary herb prized for its tightly ruffled, deep-green leaves used as a garnish and seasoning. It grows in compact mounds, favors full sun to part shade and rich, moist soil, and is slow to germinate. Treated as an annual, it bolts and seeds in its second season.
Growth habit: Compact, mound-forming biennial with a rosette of tightly curled, triple-pinnate leaves; throws a tall flowering umbel and sets seed in its second year.
What fertiliser curly parsley actually wants — and why
Curly Parsley 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 curly parsley: 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 curly parsley, 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 curly parsley:
Moderate feeder. Mix compost in before planting and feed every 3-4 weeks during growth with a balanced liquid fertilizer to keep the curls dense and richly green. Ease off feeding in winter. 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 curly parsley 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 curly parsley
Half strength is a sensible default for curly parsley — 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 curly parsley first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the curly parsley watering schedule.
Signs you are over-feeding curly parsley
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for curly parsley:
- 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 curly parsley
- 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 curly parsley care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Pot-grown curly parsley 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 curly parsley
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 curly parsley — frequently asked questions
What fertiliser does curly parsley 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. Curly Parsley 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 curly parsley?
Moderate feeder. Mix compost in before planting and feed every 3-4 weeks during growth with a balanced liquid fertilizer to keep the curls dense and richly green. Ease off feeding in winter. Moderate feeder. Mix compost in before planting and feed every 3-4 weeks during growth with a balanced liquid fertilizer to keep the curls dense and richly green. Ease off feeding in winter. 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 curly parsley?
Half strength is a sensible default for curly parsley — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
What does over-feeding curly parsley 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 curly parsley 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 curly parsley?
Pot-grown curly parsley 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
- Curly Parsley care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water curly parsley — 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 basil
- How to fertilise herb garden
- How to fertilise mint
- All 2464 fertilising guides in the Growli library