Indian Mustard 'Tendergreen' (Tendergreen mustard spinach) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun for fastest growth; tolerates part shade in summer. Aim for 5-6 hours of direct light, easing to afternoon shade where heat is intense. If your only bright window faces south, that's perfect for indian mustard 'tendergreen' — same window any aroid would fry on.

Watering

Crops like indian mustard 'tendergreen' reward consistent watering — when top 1-2 cm of soil is dry, every 2-3 days in dry spells. The mistake is the daily light sprinkle: it never reaches the deeper roots. A long soak twice a week beats a five-minute splash every day. Maintain steady moisture for tender, mild leaves. Inconsistent watering coarsens texture and sharpens flavour; mulch helps buffer dry periods.

Soil and pot

Indian Mustard 'Tendergreen' grows best in fertile, well-drained loam high in organic matter, ph 6.0-7.5. Dig in compost before sowing. Loose, nutrient-rich soil supports the rapid, succulent leaf growth that gives 'Tendergreen' its name. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Indian Mustard 'Tendergreen' sits happiest at around 40-70% humidity and 10-26°C (50-79°F). Standard outdoor humidity suits it well. Even soil moisture is the key variable; this is a forgiving field green that doesn't need humid air. If you keep the room above 10 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed indian mustard 'tendergreen' sparingly. 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. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on indian mustard 'tendergreen' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Flea beetles — Pinhole damage on leaves is common in warm, dry spring weather. Cover seedlings with insect mesh and keep them growing fast with steady water.
• Bolting in long heat — More bolt-resistant than typical mustards, but prolonged heat and long days still trigger flowering. Sow in spring and autumn and harvest young.
• Downy mildew — Pale upper-leaf patches with grey furry undersides in cool, damp conditions. Improve airflow, avoid overhead watering, and remove affected leaves.
• Slug damage on seedlings — Tender young leaves attract slugs and snails. Protect early growth and clear damp hiding places near the bed.

Propagation

Direct-sow seed 1 cm deep; thin to 10-15 cm for full plants or grow densely for cut-and-come-again leaves. Succession sow every 2-3 weeks. Germinates in 5-10 days. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Indian Mustard 'Tendergreen' is mildly toxic to pets. Brassica juncea is not individually listed by the ASPCA, but Brassica greens contain glucosinolates and isothiocyanates that can cause gastrointestinal upset, drooling and, in quantity, anaemia or thyroid effects in cats and dogs. Treat with caution and verify with a vet before allowing access. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Indian Mustard 'Tendergreen' deep-dive guides

Every aspect of indian mustard 'tendergreen' care, each with its own calibrated guide:

• Indian Mustard 'Tendergreen' watering schedule
• Indian Mustard 'Tendergreen' light requirements
• Best soil mix for indian mustard 'tendergreen'
• Indian Mustard 'Tendergreen' fertilizing guide
• When to repot indian mustard 'tendergreen'
• How to propagate indian mustard 'tendergreen'
• Indian Mustard 'Tendergreen' growth rate & size
• Indian Mustard 'Tendergreen' cold hardiness
• Indian Mustard 'Tendergreen' temperature & humidity
• Is indian mustard 'tendergreen' toxic to cats & dogs?
• Is indian mustard 'tendergreen' toxic to cats?
• Is indian mustard 'tendergreen' toxic to dogs?

Related guides

Indian Mustard 'Tendergreen' is also commonly called Tendergreen mustard spinach or komatsuna-type mustard.

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