Mature size & growth rate

How big does Common Bird's-foot Trefoil (Lotus corniculatus) get?

Also called Common Bird's-foot Trefoil, Bird's-foot Trefoil, Eggs and Bacon.

More about common bird's-foot trefoil

About Common Bird's-foot Trefoil

Lotus corniculatus · also called Common Bird's-foot Trefoil, Bird's-foot Trefoil · flowering

Lotus corniculatus is a low-growing perennial wildflower native to grasslands across Europe, Asia, and North Africa, widely naturalised in North America. It thrives in full sun on poor, well-drained, low-nitrogen soils — excessive fertility encourages leafy growth at the expense of flowers. As a legume it fixes atmospheric nitrogen through root nodal bacteria, so avoid enriching the soil. The plant contains cyanogenic glycosides (primarily lotaustralin) and is considered mildly toxic to pets if ingested in quantity.

Mature size: 10–40 cm tall, spreading to 30–60 cm wide.

Indoor size vs how big it gets in the wild

Common Bird's-foot Trefoil 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 10–40 cm tall, spreading to 30–60 cm wide.. 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

Common Bird's-foot Trefoil 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: do not feed — supplementary fertiliser suppresses flowering and undermines the nitrogen-fixing symbiosis that benefits the plant.

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

How to keep common bird's-foot trefoil smaller

You are not stuck with the maximum size. For common bird's-foot trefoil specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting common bird's-foot trefoil 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 common bird's-foot trefoil 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 common bird's-foot trefoil bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for common bird's-foot trefoil the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

Light is almost always the ceiling. The common bird's-foot trefoil light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When common bird's-foot trefoil outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for common bird's-foot trefoil:

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 common bird's-foot trefoil repotting guide. If you want more of this plant instead of a bigger one, the common bird's-foot trefoil propagation guide turns prunings into new plants.

Common Bird's-foot Trefoil size — frequently asked questions

How big does common bird's-foot trefoil get?

Common Bird's-foot Trefoil reaches 10–40 cm tall, spreading to 30–60 cm wide. 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 common bird's-foot trefoil slow or fast growing?

Common Bird's-foot Trefoil is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Common Bird's-foot Trefoil 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 common bird's-foot trefoil 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 common bird's-foot trefoil smaller?

Divide the clump every year or two — splitting common bird's-foot trefoil 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 common bird's-foot trefoil grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.