Mature size & growth rate

How big does Lysimachia nummularia (Lysimachia nummularia) get?

Also called Creeping Jenny, Moneywort, Herb Twopence.

More about lysimachia nummularia

About Lysimachia nummularia

Lysimachia nummularia · also called Creeping Jenny, Moneywort · flowering

Creeping Jenny is a fast, ground-hugging perennial with round, coin-like leaves on prostrate stems that root as they run. Through summer it studs the carpet with cup-shaped, bright yellow flowers. Equally happy at pond margins, in damp borders, or trailing from containers, it is vigorous to the point of invasiveness in moist, fertile ground.

Mature size: 5-10 cm tall, spreading 45-60 cm or more per plant and continuing to root outward indefinitely.

Watch for — Bare, leggy centres: Old mats can go thin and woody in the middle. Shear or pull out tired growth to encourage fresh rooting runners.

Indoor size vs how big it gets in the wild

Lysimachia nummularia 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 5-10 cm tall, spreading 45-60 cm or more per plant and continuing to root outward indefinitely.. 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

Lysimachia nummularia is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: needs little feeding in decent soil and over-feeding only accelerates its already rampant spread. a light topdressing of compost in spring is plenty. in containers, a dilute balanced liquid feed monthly through summer keeps trailing growth lush.

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

How to keep lysimachia nummularia smaller

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

Divide the clump every year or two — splitting lysimachia nummularia 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 lysimachia nummularia 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 lysimachia nummularia bigger or faster

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

When lysimachia nummularia outgrows the room (or the pot)

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

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

Lysimachia nummularia size — frequently asked questions

How big does lysimachia nummularia get?

Lysimachia nummularia reaches 5-10 cm tall, spreading 45-60 cm or more per plant and continuing to root outward indefinitely. 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 lysimachia nummularia slow or fast growing?

Lysimachia nummularia is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Lysimachia nummularia 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 lysimachia nummularia take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep lysimachia nummularia smaller?

Divide the clump every year or two — splitting lysimachia nummularia 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 lysimachia nummularia 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.