Mature size & growth rate

How big does Night-scented stock (Matthiola longipetala) get?

Also called Night-scented stock, Evening stock, Perfume plant, Gilly flower.

More about night-scented stock

About Night-scented stock

Matthiola longipetala · also called Night-scented stock, Evening stock · flowering

Night-scented stock is a fast-growing hardy annual whose small, purple or pale lilac flowers appear modest by day — petals fold inward in sunlight — but open wide at dusk, releasing an extraordinarily powerful, sweet fragrance. Sow directly into beds in full sun, water sparingly, and expect flowers within 6–8 weeks from seed.

Mature size: 20–45 cm tall (8–18 in), 15–30 cm spread (6–12 in)

Indoor size vs how big it gets in the wild

Night-scented stock 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 20–45 cm tall (8–18 in), 15–30 cm spread (6–12 in). 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

Night-scented stock 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: minimal fertiliser required. excessively rich soil reduces flowering. a light application of balanced granular feed at sowing is sufficient. in containers, feed with a dilute balanced liquid feed once a month.

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

How to keep night-scented stock smaller

You are not stuck with the maximum size. For night-scented stock specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of night-scented stock 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 night-scented stock bigger or faster

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

When night-scented stock outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for night-scented stock:

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

Night-scented stock size — frequently asked questions

How big does night-scented stock get?

Night-scented stock reaches 20–45 cm tall (8–18 in), 15–30 cm spread (6–12 in) 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 night-scented stock slow or fast growing?

Night-scented stock is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Night-scented stock 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 night-scented stock 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 night-scented stock smaller?

Choose a compact or dwarf variety of night-scented stock 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 night-scented stock 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.