Mature size & growth rate

How big does Mustard Spinach 'Savanna' (Brassica rapa var. perviridis 'Savanna') get?

Also called Savanna mustard spinach, komatsuna cultivar.

More about mustard spinach 'savanna'

About Mustard Spinach 'Savanna'

Brassica rapa var. perviridis 'Savanna' · also called Savanna mustard spinach, komatsuna cultivar · edible

'Savanna' is a vigorous komatsuna (mustard spinach), a fast, leafy Asian green with smooth, glossy dark-green leaves on crisp stems. It tastes milder than mustard and richer than spinach, stands both heat and cold better than true spinach, and is slow to bolt. Crop it as baby leaf in weeks or grow on to full bunches.

Mature size: 25-40 cm tall and 20-30 cm wide; harvest baby leaf at 10 cm.

Watch for — Flea beetles: The most common pest; tiny holes peppering young leaves slow growth. Cover with fine mesh from sowing and water well to outpace damage.

Indoor size vs how big it gets in the wild

Mustard Spinach 'Savanna' 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 25-40 cm tall and 20-30 cm wide. In the ground with no restriction it is a completely different plant — harvest baby leaf at 10 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

Mustard Spinach 'Savanna' 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 nitrogen-leaning balanced feed at sowing and a diluted liquid feed every 2 weeks for repeated cut-and-come-again harvests. steady nitrogen keeps leaves tender and mild rather than hot.

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

How to keep mustard spinach 'savanna' smaller

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

Choose a compact or dwarf variety of mustard spinach 'savanna' 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 mustard spinach 'savanna' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for mustard spinach 'savanna' 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 mustard spinach 'savanna' light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When mustard spinach 'savanna' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for mustard spinach 'savanna':

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 mustard spinach 'savanna' repotting guide. If you want more of this plant instead of a bigger one, the mustard spinach 'savanna' propagation guide turns prunings into new plants.

Mustard Spinach 'Savanna' size — frequently asked questions

How big does mustard spinach 'savanna' get?

Mustard Spinach 'Savanna' reaches 25-40 cm tall and 20-30 cm wide when grown indoors, and far larger where it grows unrestricted (harvest baby leaf at 10 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 mustard spinach 'savanna' slow or fast growing?

Mustard Spinach 'Savanna' is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Mustard Spinach 'Savanna' 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 mustard spinach 'savanna' 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 mustard spinach 'savanna' smaller?

Choose a compact or dwarf variety of mustard spinach 'savanna' 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 mustard spinach 'savanna' 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.