Mature size & growth rate

How big does Shiso (Perilla) (Perilla frutescens) get?

Also called Shiso, Perilla, Beefsteak plant, Perilla mint, Japanese basil, Purple mint.

More about shiso (perilla)

About Shiso (Perilla)

Perilla frutescens · also called Shiso, Perilla · herb

Shiso (Perilla frutescens) is a fast-growing, mint-family culinary annual prized in Japanese, Korean and Vietnamese cooking for its fragrant green or purple leaves. Give it warm weather, full sun to light shade and steady moisture. It is not ASPCA-listed but contains perilla ketone, so treat it as mildly toxic and keep curious pets away.

Mature size: About 30-90 cm (1-3 ft) tall and 30-45 cm (12-18 in) wide

Watch for — Leggy, sparse growth: Too little light or skipped pinching produces tall, floppy stems with few leaves. Give full sun (or a grow light indoors) and pinch growing tips regularly to keep plants compact and bushy.

Indoor size vs how big it gets in the wild

Shiso (Perilla) 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 about 30-90 cm (1-3 ft) tall and 30-45 cm (12-18 in) 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

Shiso (Perilla) 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: feed every 3-4 weeks during active growth with a balanced or slightly nitrogen-forward liquid fertiliser (such as a 10-10-10 or fish emulsion) at half to full strength to fuel leafy growth. rich soil amended with compost at planting reduces the need. avoid over-feeding, which produces lush but blander leaves.

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

How to keep shiso (perilla) smaller

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

Choose a compact or dwarf variety of shiso (perilla) 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 shiso (perilla) bigger or faster

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

When shiso (perilla) outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for shiso (perilla):

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

Shiso (Perilla) size — frequently asked questions

How big does shiso (perilla) get?

Shiso (Perilla) reaches about 30-90 cm (1-3 ft) tall and 30-45 cm (12-18 in) 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 shiso (perilla) slow or fast growing?

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

Choose a compact or dwarf variety of shiso (perilla) 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 shiso (perilla) 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.