Fertilising guide
How to fertilise Curly Endive 'Frisee' (Cichorium endivia var. crispum 'Frisee')— schedule & NPK
Also called frisee, curly endive, frizzy endive.
More about curly endive 'frisee'
About Curly Endive 'Frisee'
Cichorium endivia var. crispum 'Frisee' · also called frisee, curly endive · edible
Curly endive, or frisee, forms a low rosette of finely cut, frizzy green leaves with a crisp, pleasantly bitter bite. Blanching the centre by covering the heart for a week or two turns the inner leaves pale yellow, crisp and milder. A fast cool-season salad crop best grown for late summer and autumn cutting.
Growth habit: Flat, spreading rosette of deeply cut, narrow curled leaves on a shallow root; bolts to a branched flower stem in heat or its second season.
Watch for — Failed or rotting blanch: Blanching a damp heart causes rot rather than a sweet pale centre. Blanch only dry plants by gathering and tying or covering the heart for 1-2 weeks, and check regularly.
What fertiliser curly endive 'frisee' actually wants — and why
Curly Endive 'Frisee' is grown entirely for its leaves, so nitrogen is the priority — steady, nitrogen-leaning feeding keeps it growing fast, tender and unbolted.
A nitrogen-leaning feed (higher first number) or compost-rich soil — nitrogen drives the fast, tender leafy growth this crop is grown for. Phosphorus and potassium matter far less here than for fruiting crops.
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 endive 'frisee': 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 endive 'frisee', 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 endive 'frisee':
Moderate feeder: work in compost before sowing and give a balanced or nitrogen-leaning feed mid-growth to keep leaves lush and fast. Quick, unchecked growth produces the mildest, most tender leaves; avoid stop-start feeding which increases bitterness. In practice: a balanced or compost-rich start, then a nitrogen side-dress or liquid feed every 3-4 weeks through the cropping period in the main season (spring through early autumn).
The dormant-season rule matters more than the exact interval: skip feeding entirely when curly endive 'frisee' 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 endive 'frisee'
Use the vegetable-feed label rate for curly endive 'frisee'. Steady availability matters more than a strong dose — a check in growth makes leaves tough and can trigger bolting.
Feeding always goes onto already-damp soil, never dry roots — water curly endive 'frisee' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the curly endive 'frisee' watering schedule.
Signs you are over-feeding curly endive 'frisee'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for curly endive 'frisee':
- Very soft, floppy, dark-green growth that attracts aphids.
- Excess leafy growth at the expense of hearts/heads in cabbage and the like.
- Salt crust and scorched leaf edges in containers; nitrate-heavy leaves.
Signs you are under-feeding curly endive 'frisee'
- Pale, yellow-green leaves, oldest first, and slow growth.
- Small, tough, bitter leaves and premature bolting.
- Weak, stunted heads in cabbage, broccoli and cauliflower.
If the symptoms point at watering, light or roots rather than nutrition, the full curly endive 'frisee' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
For container-grown curly endive 'frisee', water until it drains freely each time and flush pots monthly with plain water to stop nitrogen salts accumulating; in the ground, good compost levels naturally buffer this.
Organic vs synthetic feeds for curly endive 'frisee'
Organic options
Well-rotted manure or compost dug in, plus nitrogen-rich liquid feeds like diluted chicken-manure pellets or nettle feed. UK: pelleted chicken manure or Westland; US: Espoma Garden-tone or blood meal. Steady and soil-building.
Synthetic / liquid feeds
A balanced feed at planting then a high-nitrogen liquid or granular side-dress — UK: Growmore then a nitrogen feed or Phostrogen; US: a 10-10-10 then a high-N (e.g. 21-0-0) side-dress or Miracle-Gro.
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 endive 'frisee' — frequently asked questions
What fertiliser does curly endive 'frisee' need?
A nitrogen-leaning feed (higher first number) or compost-rich soil — nitrogen drives the fast, tender leafy growth this crop is grown for. Phosphorus and potassium matter far less here than for fruiting crops. Curly Endive 'Frisee' is grown entirely for its leaves, so nitrogen is the priority — steady, nitrogen-leaning feeding keeps it growing fast, tender and unbolted.
How often should I feed curly endive 'frisee'?
Moderate feeder: work in compost before sowing and give a balanced or nitrogen-leaning feed mid-growth to keep leaves lush and fast. Quick, unchecked growth produces the mildest, most tender leaves; avoid stop-start feeding which increases bitterness. Moderate feeder: work in compost before sowing and give a balanced or nitrogen-leaning feed mid-growth to keep leaves lush and fast. Quick, unchecked growth produces the mildest, most tender leaves; avoid stop-start feeding which increases bitterness. In practice: a balanced or compost-rich start, then a nitrogen side-dress or liquid feed every 3-4 weeks through the cropping period in the main season (spring through early autumn).
What strength of feed for curly endive 'frisee'?
Use the vegetable-feed label rate for curly endive 'frisee'. Steady availability matters more than a strong dose — a check in growth makes leaves tough and can trigger bolting.
What does over-feeding curly endive 'frisee' look like?
Very soft, floppy, dark-green growth that attracts aphids. Excess leafy growth at the expense of hearts/heads in cabbage and the like. Salt crust and scorched leaf edges in containers; nitrate-heavy leaves. Letting curly endive 'frisee' run short of nitrogen mid-crop is the main mistake — growth checks, leaves toughen and brassicas/leafy greens bolt or turn bitter. Keep nitrogen steadily available.
Should I flush the soil of curly endive 'frisee'?
For container-grown curly endive 'frisee', water until it drains freely each time and flush pots monthly with plain water to stop nitrogen salts accumulating; in the ground, good compost levels naturally buffer this.
Keep reading
- Curly Endive 'Frisee' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water curly endive 'frisee' — 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 tomato
- How to fertilise pepper
- How to fertilise cucumber
- All 5561 fertilising guides in the Growli library