Mature size & growth rate

How big does Showy Tick Trefoil (Desmodium canadense) get?

Also called Showy tick trefoil, Canada tick trefoil, Showy tick clover.

More about showy tick trefoil

About Showy Tick Trefoil

Desmodium canadense · also called Showy tick trefoil, Canada tick trefoil · flowering

Desmodium canadense is a tall, robust native perennial wildflower of moist prairies, thicket edges, and open woodland borders across eastern and central North America, from Nova Scotia to Saskatchewan and south to Oklahoma and North Carolina. It produces showy rose-pink to purple pea-like flowers in branched racemes in mid- to late summer, making it one of the most ornamentally valuable of the native tick trefoils for pollinator gardens. It tolerates a broader range of soil moisture than most prairie natives and self-seeds freely. It is not listed as toxic to cats or dogs by the ASPCA, though its seed pods attach to fur and clothing via hooked hairs.

Mature size: 90–180 cm (3–6 ft) tall and 60–90 cm (24–36 in) wide.

Indoor size vs how big it gets in the wild

Showy Tick 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 90–180 cm (3–6 ft) tall and 60–90 cm (24–36 in) 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

Showy Tick 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: no feeding required; as a nitrogen-fixing legume it meets its own nutritional needs in average to lean soils. fertilising promotes excessive height and flopping.

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

How to keep showy tick trefoil smaller

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

Divide the clump every year or two — splitting showy tick 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 showy tick 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 showy tick trefoil bigger or faster

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

When showy tick trefoil outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for showy tick 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 showy tick trefoil repotting guide. If you want more of this plant instead of a bigger one, the showy tick trefoil propagation guide turns prunings into new plants.

Showy Tick Trefoil size — frequently asked questions

How big does showy tick trefoil get?

Showy Tick Trefoil reaches 90–180 cm (3–6 ft) tall and 60–90 cm (24–36 in) 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 showy tick trefoil slow or fast growing?

Showy Tick Trefoil is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Showy Tick 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 showy tick 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 showy tick trefoil smaller?

Divide the clump every year or two — splitting showy tick 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 showy tick 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.