Mature size & growth rate

How big does Green Shiso (Perilla frutescens var. frutescens) get?

Also called Green Shiso, Ao Shiso, Green Perilla.

More about green shiso

About Green Shiso

Perilla frutescens var. frutescens · also called Green Shiso, Ao Shiso · herb

Green shiso is a fragrant mint-family annual prized in Japanese cooking for its bright green, frilly, basil-and-anise-scented leaves used with sashimi and tempura. It grows fast in warm conditions, prefers moist, fertile soil and gentle afternoon shade in hot regions, and self-seeds readily. Pinch flower spikes to keep leaves tender and prolong harvest.

Mature size: 45-90 cm tall and 30-45 cm wide.

Indoor size vs how big it gets in the wild

Green Shiso 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 45-90 cm tall and 30-45 cm wide.. 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

Green Shiso 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: moderate feeder grown for leaf. work compost in at planting and give a balanced or nitrogen-leaning liquid feed every 3-4 weeks to keep new growth tender.

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

How to keep green shiso smaller

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

Choose a compact or dwarf variety of green shiso 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 green shiso bigger or faster

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

When green shiso outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for green shiso:

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

Green Shiso size — frequently asked questions

How big does green shiso get?

Green Shiso reaches 45-90 cm tall and 30-45 cm wide. 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 green shiso slow or fast growing?

Green Shiso is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Green Shiso 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 green shiso 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 green shiso smaller?

Choose a compact or dwarf variety of green shiso 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 green shiso 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.