Mature size & growth rate

How big does Sweet Cicely (Myrrhis odorata) get?

Also called sweet cicely, garden myrrh, anise fern.

More about sweet cicely

About Sweet Cicely

Myrrhis odorata · also called sweet cicely, garden myrrh · herb

Sweet cicely is a hardy perennial herb with soft, fern-like foliage and an aniseed-sweet flavour used to reduce the sugar needed when stewing tart fruit. It forms a clump of feathery leaves topped by lacy white umbels in late spring. Thriving in cool, partly shaded gardens, it self-seeds freely and dies back over winter.

Mature size: 60-120 cm tall and 60-90 cm wide at maturity.

Watch for — Powdery mildew late season: Crowded, dry plants can develop mildew on aging leaves; improve airflow and cut back tired growth to encourage fresh foliage.

Indoor size vs how big it gets in the wild

Sweet Cicely stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect 60-120 cm tall and 60-90 cm wide at maturity.. 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.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Sweet Cicely is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: largely self-sufficient in fertile soil. an annual spring mulch of garden compost or well-rotted manure supplies all the nutrients it needs; avoid high-nitrogen feeds that produce sappy, floppy growth.

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

How to keep sweet cicely smaller

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

Divide the clump every year or two — splitting sweet cicely is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide sweet cicely out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow sweet cicely bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for sweet cicely the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Brighter light speeds up clump and offset production noticeably.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

Light is almost always the ceiling. The sweet cicely light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When sweet cicely outgrows the room (or the pot)

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

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the sweet cicely repotting guide. If you want more of this plant instead of a bigger one, the sweet cicely propagation guide turns prunings into new plants.

Sweet Cicely size — frequently asked questions

How big does sweet cicely get?

Sweet Cicely reaches 60-120 cm tall and 60-90 cm wide at maturity. when grown indoors. Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is sweet cicely slow or fast growing?

Sweet Cicely is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Sweet Cicely stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does sweet cicely take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep sweet cicely smaller?

Divide the clump every year or two — splitting sweet cicely is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make sweet cicely grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Brighter light speeds up clump and offset production noticeably. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.