Mature size & growth rate

How big does Stevia (Stevia rebaudiana) get?

Also called sweetleaf, sugar leaf, candyleaf.

About Stevia

Stevia rebaudiana · also called sweetleaf, sugar leaf · herb

Stevia is a South American perennial herb grown for naturally sweet leaves used as a sugar substitute. Tender — usually grown as an annual or overwintered indoors. Pet-safe in moderation; stevia is generally recognised as safe.

Stevia rebaudiana (Asteraceae) is a tender perennial native to the warm, humid subtropics of Paraguay and Brazil; its leaves contain steviol glycosides (mainly stevioside and rebaudioside) that are roughly 200-300 times sweeter than sugar.

Grows on weak stems to about 12-24 in tall; winter-hardy only in USDA zones 10-11, so it is grown as an annual or container plant and cannot survive frost.

Mature size: 30-60 cm tall

Watch for — Leggy growth: Pinch tops to keep bushy.

Sources: plants.ces.ncsu.edu, herbsocietypioneer.org

Indoor size vs how big it gets in the wild

Stevia 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 30-60 cm tall. 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

Stevia is a moderate grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: balanced feed monthly during growth; low nitrogen for sweetest leaves.

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

How to keep stevia smaller

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

Choose a compact or dwarf variety of stevia 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 stevia bigger or faster

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

When stevia outgrows the room (or the pot)

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

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

Stevia size — frequently asked questions

How big does stevia get?

Stevia reaches 30-60 cm tall 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 stevia slow or fast growing?

Stevia is a moderate grower. Expect a single growing season — it reaches full size in one year, then is done. Stevia 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 stevia 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 stevia smaller?

Choose a compact or dwarf variety of stevia 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 stevia 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.