Fertilising guide
How to fertilise Swiss Chard 'Peppermint' (Beta vulgaris subsp. cicla 'Peppermint')— schedule & NPK
Also called Peppermint chard, striped chard.
More about swiss chard 'peppermint'
About Swiss Chard 'Peppermint'
Beta vulgaris subsp. cicla 'Peppermint' · also called Peppermint chard, striped chard · edible
Swiss Chard 'Peppermint' is an ornamental-edible leaf beet whose candy-striped stems are streaked pink and white, recalling peppermint sticks. Grown for both the kitchen and the border, it offers tender green leaves and colourful crunchy stalks over a long cut-and-come-again season. Like other chard it is productive, frost-tolerant and undemanding, thriving in cool, moist conditions.
Growth habit: Biennial grown as an annual; upright clump of green leaves on slim pink-and-white striped stalks, regrowing when outer leaves are harvested.
Watch for — Beet leaf miner: Larvae mine pale blisters within the leaves; pick off affected leaves promptly and cover plants with fine insect mesh.
What fertiliser swiss chard 'peppermint' actually wants — and why
Swiss Chard 'Peppermint' 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 swiss chard 'peppermint': 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 swiss chard 'peppermint', 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 swiss chard 'peppermint':
Moderate feeder. Mix compost in at planting, then apply a balanced or nitrogen-rich liquid feed every 3-4 weeks to keep new leaves coming through the season. 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 swiss chard 'peppermint' 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 swiss chard 'peppermint'
Use the vegetable-feed label rate for swiss chard 'peppermint'. 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 swiss chard 'peppermint' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the swiss chard 'peppermint' watering schedule.
Signs you are over-feeding swiss chard 'peppermint'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for swiss chard 'peppermint':
- 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 swiss chard 'peppermint'
- 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 swiss chard 'peppermint' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
For container-grown swiss chard 'peppermint', 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 swiss chard 'peppermint'
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 swiss chard 'peppermint' — frequently asked questions
What fertiliser does swiss chard 'peppermint' 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. Swiss Chard 'Peppermint' 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 swiss chard 'peppermint'?
Moderate feeder. Mix compost in at planting, then apply a balanced or nitrogen-rich liquid feed every 3-4 weeks to keep new leaves coming through the season. Moderate feeder. Mix compost in at planting, then apply a balanced or nitrogen-rich liquid feed every 3-4 weeks to keep new leaves coming through the season. 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 swiss chard 'peppermint'?
Use the vegetable-feed label rate for swiss chard 'peppermint'. Steady availability matters more than a strong dose — a check in growth makes leaves tough and can trigger bolting.
What does over-feeding swiss chard 'peppermint' 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 swiss chard 'peppermint' 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 swiss chard 'peppermint'?
For container-grown swiss chard 'peppermint', 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
- Swiss Chard 'Peppermint' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water swiss chard 'peppermint' — 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