Mature size & growth rate

How big does Dill (Anethum graveolens) get?

Also called common dill, dill weed.

About Dill

Anethum graveolens · also called common dill, dill weed · herb

Dill is an annual herb in the carrot family grown for feathery foliage (dill weed) and aromatic seeds. Direct-sow in succession; it bolts fast in heat. Host plant for swallowtail butterflies. Pet-safe in culinary amounts.

Anethum graveolens, an aromatic annual (sometimes biennial) umbellifer of the carrot family, grown for its finely dissected blue-green foliage and flat umbels of tiny yellow flowers.

Short-lived once it flowers, so sow successionally through the season for continuous leaf; leave a few plants to set seed for both pickling heads and self-seeded volunteers.

Mature size: 60-120 cm tall

Sources: extension.umn.edu, extension.illinois.edu, rhs.org.uk

Indoor size vs how big it gets in the wild

Dill 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 60-120 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

Dill 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: light feed at planting; avoid high nitrogen.

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

How to keep dill smaller

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

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

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

When dill outgrows the room (or the pot)

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

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

Dill size — frequently asked questions

How big does dill get?

Dill reaches 60-120 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 dill slow or fast growing?

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

Choose a compact or dwarf variety of dill 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 dill 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.