Fertilising guide

How to fertilise Indian Mustard 'Tendergreen' (Brassica juncea 'Tendergreen')— schedule & NPK

Also called Tendergreen mustard spinach, komatsuna-type mustard.

More about indian mustard 'tendergreen'

About Indian Mustard 'Tendergreen'

Brassica juncea 'Tendergreen' · also called Tendergreen mustard spinach, komatsuna-type mustard · edible

'Tendergreen', also called mustard spinach, is a vigorous, smooth-leaved mustard grown for mild, spinach-like greens. Quick to mature in about 40 days, it tolerates heat and cold better than most mustards and resists bolting. Sow in succession for tender salad leaves or cooked greens through spring, autumn, and into mild winters.

Growth habit: Upright clump of broad, smooth, glossy oval leaves on pale stalks; fast, productive, and slow to bolt.

Watch for — Downy mildew: Pale upper-leaf patches with grey furry undersides in cool, damp conditions. Improve airflow, avoid overhead watering, and remove affected leaves.

What fertiliser indian mustard 'tendergreen' actually wants — and why

Indian Mustard 'Tendergreen' feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

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 indian mustard 'tendergreen': 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 indian mustard 'tendergreen', 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 indian mustard 'tendergreen':

Apply a balanced liquid feed every 2-3 weeks during leaf growth, leaning slightly toward nitrogen. In a compost-rich bed, minimal feeding is needed; avoid excess nitrogen, which softens disease resistance. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).

The dormant-season rule matters more than the exact interval: skip feeding entirely when indian mustard 'tendergreen' 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 indian mustard 'tendergreen'

Follow the crop-feed label rate for indian mustard 'tendergreen' — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.

Feeding always goes onto already-damp soil, never dry roots — water indian mustard 'tendergreen' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the indian mustard 'tendergreen' watering schedule.

Signs you are over-feeding indian mustard 'tendergreen'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for indian mustard 'tendergreen':

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
Lush foliage hiding the crop; soft growth prone to pests and disease.
Salt crust on the soil and scorched leaf edges in containers.

Signs you are under-feeding indian mustard 'tendergreen'

Pale, yellowing lower leaves and stunted growth.
Small fruit, poor set, and a quickly exhausted plant.
Blossom-end rot and weak cropping from erratic or insufficient feeding.

If the symptoms point at watering, light or roots rather than nutrition, the full indian mustard 'tendergreen' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

In containers, fertiliser salts build up fast — water indian mustard 'tendergreen' thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.

Organic vs synthetic feeds for indian mustard 'tendergreen'

Organic options

Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.

Synthetic / liquid feeds

A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.

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 indian mustard 'tendergreen' — frequently asked questions

What fertiliser does indian mustard 'tendergreen' need?

Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. Indian Mustard 'Tendergreen' feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

How often should I feed indian mustard 'tendergreen'?

Apply a balanced liquid feed every 2-3 weeks during leaf growth, leaning slightly toward nitrogen. In a compost-rich bed, minimal feeding is needed; avoid excess nitrogen, which softens disease resistance. Apply a balanced liquid feed every 2-3 weeks during leaf growth, leaning slightly toward nitrogen. In a compost-rich bed, minimal feeding is needed; avoid excess nitrogen, which softens disease resistance. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).

What strength of feed for indian mustard 'tendergreen'?

What does over-feeding indian mustard 'tendergreen' look like?

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once indian mustard 'tendergreen' starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.

Should I flush the soil of indian mustard 'tendergreen'?