Fertilising guide
How to fertilise Mustard Greens 'Southern Giant Curled' (Brassica juncea var. crispifolia 'Southern Giant Curled')— schedule & NPK
Also called Southern Giant Curled mustard, curled mustard greens.
More about mustard greens 'southern giant curled'
About Mustard Greens 'Southern Giant Curled'
Brassica juncea var. crispifolia 'Southern Giant Curled' · also called Southern Giant Curled mustard, curled mustard greens · edible
Mustard greens 'Southern Giant Curled' is a heirloom Southern US favourite with large, bright-green, frilly curled leaves and a robust peppery flavour, ready in about 45-50 days. Vigorous and productive, it is a classic cooking green and slow to bolt for a mustard. Grow it cool, well-fed and evenly watered for tender, abundant foliage.
Growth habit: Large, upright, vigorous rosette of broad bright-green leaves with heavily curled, frilled margins; bolts to a tall flowering stalk in heat.
What fertiliser mustard greens 'southern giant curled' actually wants — and why
Mustard Greens 'Southern Giant Curled' 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 mustard greens 'southern giant curled': 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 mustard greens 'southern giant curled', 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 mustard greens 'southern giant curled':
Feed generously for leaf production: compost-rich bed plus a nitrogen side-dress 2-3 weeks after thinning. Consistent nitrogen keeps the curled leaves tender and milder-flavoured. 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 mustard greens 'southern giant curled' 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 mustard greens 'southern giant curled'
Use the vegetable-feed label rate for mustard greens 'southern giant curled'. 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 mustard greens 'southern giant curled' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mustard greens 'southern giant curled' watering schedule.
Signs you are over-feeding mustard greens 'southern giant curled'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mustard greens 'southern giant curled':
- 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 mustard greens 'southern giant curled'
- 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 mustard greens 'southern giant curled' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
For container-grown mustard greens 'southern giant curled', 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 mustard greens 'southern giant curled'
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 mustard greens 'southern giant curled' — frequently asked questions
What fertiliser does mustard greens 'southern giant curled' 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. Mustard Greens 'Southern Giant Curled' 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 mustard greens 'southern giant curled'?
Feed generously for leaf production: compost-rich bed plus a nitrogen side-dress 2-3 weeks after thinning. Consistent nitrogen keeps the curled leaves tender and milder-flavoured. Feed generously for leaf production: compost-rich bed plus a nitrogen side-dress 2-3 weeks after thinning. Consistent nitrogen keeps the curled leaves tender and milder-flavoured. 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 mustard greens 'southern giant curled'?
Use the vegetable-feed label rate for mustard greens 'southern giant curled'. Steady availability matters more than a strong dose — a check in growth makes leaves tough and can trigger bolting.
What does over-feeding mustard greens 'southern giant curled' 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 mustard greens 'southern giant curled' 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 mustard greens 'southern giant curled'?
For container-grown mustard greens 'southern giant curled', 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
- Mustard Greens 'Southern Giant Curled' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water mustard greens 'southern giant curled' — 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