Mature size & growth rate

How big does Choy Sum 'Green Lance' (Brassica rapa var. parachinensis 'Green Lance') get?

Also called Green Lance choy sum, Chinese flowering cabbage.

More about choy sum 'green lance'

About Choy Sum 'Green Lance'

Brassica rapa var. parachinensis 'Green Lance' · also called Green Lance choy sum, Chinese flowering cabbage · edible

Choy Sum 'Green Lance' is a fast Chinese flowering cabbage grown for sweet, tender flowering stems, leaves, and small yellow buds harvested before full bloom. Quick to mature in 35-50 days, it crops productively in cool seasons and tolerates some heat, regrowing side shoots after the main stem is cut for repeated stir-fry harvests.

Mature size: 25-40 cm tall and 15-25 cm wide at harvest.

Watch for — Flea beetles: Shot-hole damage on seedling leaves slows establishment. Protect with fine mesh and grow young plants on quickly.

Indoor size vs how big it gets in the wild

Choy Sum 'Green Lance' 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 15-25 cm wide at harvest.. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

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

Choy Sum 'Green Lance' 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: fast, hungry crop: prepare beds with compost or balanced fertiliser, then feed with a nitrogen-rich liquid feed every 2 weeks for lush stems, easing off slightly as flower buds form.

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

How to keep choy sum 'green lance' smaller

You are not stuck with the maximum size. For choy sum 'green lance' specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of choy sum 'green lance' 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 choy sum 'green lance' bigger or faster

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

When choy sum 'green lance' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for choy sum 'green lance':

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 choy sum 'green lance' repotting guide. If you want more of this plant instead of a bigger one, the choy sum 'green lance' propagation guide turns prunings into new plants.

Choy Sum 'Green Lance' size — frequently asked questions

How big does choy sum 'green lance' get?

Choy Sum 'Green Lance' reaches 25-40 cm tall and 15-25 cm wide at harvest. when grown indoors. 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 choy sum 'green lance' slow or fast growing?

Choy Sum 'Green Lance' is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Choy Sum 'Green Lance' 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 choy sum 'green lance' 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 choy sum 'green lance' smaller?

Choose a compact or dwarf variety of choy sum 'green lance' 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 choy sum 'green lance' 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.