Mature size & growth rate

How big does Indian Mustard 'Tendergreen' (Brassica juncea 'Tendergreen') get?

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.

Mature size: 25-35 cm tall and wide at maturity; harvest baby leaves from 10-15 cm

Watch for — Slug damage on seedlings: Tender young leaves attract slugs and snails. Protect early growth and clear damp hiding places near the bed.

Indoor size vs how big it gets in the wild

Indian Mustard 'Tendergreen' reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back. Indoors and in a pot, expect 25-35 cm tall and wide at maturity. In the ground with no restriction it is a completely different plant — harvest baby leaves from 10-15 cm — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Growth rate and years to mature

Indian Mustard 'Tendergreen' is a fast grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: 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.

Want this turned into the right next pot at the right moment? The pot size calculator and the indian mustard 'tendergreen' repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast indian mustard 'tendergreen' grows.

How to keep indian mustard 'tendergreen' smaller

You are not stuck with the maximum size. For indian mustard 'tendergreen' specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of indian mustard 'tendergreen' from the start — that is the most reliable size control for an annual.
Grow it in a smaller container to naturally limit how large it gets.
For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier.
Sow a little later or space plants closer if you specifically want smaller individual plants.

How to grow indian mustard 'tendergreen' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for indian mustard 'tendergreen' the accelerators are:

Full sun, warm soil and steady water are what drive a crop to full size fastest.
Sow at the right time for your zone so it gets the whole season to size up.
Feed appropriately for the crop and never let it check (stall) from drought or cold.

Light is almost always the ceiling. The indian mustard 'tendergreen' light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When indian mustard 'tendergreen' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for indian mustard 'tendergreen':

It sprawls beyond its bed or container before harvest — usually a spacing or support issue.
It flops or needs staking once it hits full height.
Once it has fruited or bolted, it is at its final size for good — the next plant is a new sowing.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the indian mustard 'tendergreen' repotting guide. If you want more of this plant instead of a bigger one, the indian mustard 'tendergreen' propagation guide turns prunings into new plants.

Indian Mustard 'Tendergreen' size — frequently asked questions

How big does indian mustard 'tendergreen' get?

Indian Mustard 'Tendergreen' reaches 25-35 cm tall and wide at maturity when grown indoors, and far larger where it grows unrestricted (harvest baby leaves from 10-15 cm). It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Is indian mustard 'tendergreen' slow or fast growing?

Indian Mustard 'Tendergreen' is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Indian Mustard 'Tendergreen' reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back.

How long does indian mustard 'tendergreen' take to reach full size?

Roughly a single growing season — it reaches full size in one year, then is done. Light, pot size and feeding move that timeline more than anything else.

How do I keep indian mustard 'tendergreen' smaller?

Choose a compact or dwarf variety of indian mustard 'tendergreen' from the start — that is the most reliable size control for an annual. Grow it in a smaller container to naturally limit how large it gets. For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier. Sow a little later or space plants closer if you specifically want smaller individual plants.

How can I make indian mustard 'tendergreen' grow bigger or faster?

Full sun, warm soil and steady water are what drive a crop to full size fastest. Sow at the right time for your zone so it gets the whole season to size up. Feed appropriately for the crop and never let it check (stall) from drought or cold.