Mature size & growth rate

How big does Kitten Tails (Besseya bullii) get?

Also called Kitten tails, Kittentails, Bull's besseya.

More about kitten tails

About Kitten Tails

Besseya bullii · also called Kitten tails, Kittentails · flowering

Besseya bullii is a rare, conservative perennial wildflower endemic to six Upper Midwestern US states — Wisconsin, Minnesota, Iowa, Illinois, Indiana, and Ohio — where it inhabits dry sand prairies, oak savannas, bluff edges, and gravelly hillsides. It produces a basal rosette of woolly leaves from which a single fluffy spike of yellowish-green flowers emerges in April through June, standing 20–40 cm tall. The species is state-threatened or endangered across its entire range and is extremely sensitive to habitat disturbance, relying on periodic fire management to keep competing vegetation in check. Besseya bullii is not listed by the ASPCA and its safety for pets is unconfirmed; it is classified here as mildly toxic out of caution.

Mature size: 20–40 cm (8–16 in) tall in flower; rosette spread 10–20 cm (4–8 in).

Indoor size vs how big it gets in the wild

Kitten Tails is a naturally small plant — it stays shelf- and desk-sized for its whole life, so it never becomes a space problem. Indoors and in a pot, expect 20–40 cm (8–16 in) tall in flower. In the ground with no restriction it is a completely different plant — rosette spread 10–20 cm (4–8 in). — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It grows mostly by adding leaves, offsets or a slightly wider rosette rather than gaining height — the footprint barely changes year to year.

Growth rate and years to mature

Kitten Tails is a slow grower. Realistically, expect many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Its feeding profile backs this up: do not fertilise — additional nutrients favour competing weeds and grasses that suppress this small, slow-growing wildflower.

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

How to keep kitten tails smaller

Good news — kitten tails barely needs managing. If you do want to keep it tidy:

You rarely need to do anything: kitten tails is so slow that it can sit in the same small pot for years.
Keeping it slightly pot-bound and easing back on feed naturally caps the size.
Pinch or remove the oldest, tiredest leaves so energy goes into a compact, fresh-looking plant.

How to grow kitten tails bigger or faster

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

Move it to brighter (but not scorching) light — that is the single biggest growth lever for a small plant.
A small step up in pot size every couple of years gives the roots a little more room without triggering a size jump.
Feed lightly through the growing season; this plant simply will not race however hard you push it.

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

When kitten tails outgrows the room (or the pot)

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

Roots circling the bottom or pushing out of the drainage hole — it wants a pot one size up, not a bigger room.
Offsets crowding the surface so the original plant looks squashed.
Honestly, kitten tails rarely outgrows a room — outgrowing its pot is the only realistic limit.

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

Kitten Tails size — frequently asked questions

How big does kitten tails get?

Kitten Tails reaches 20–40 cm (8–16 in) tall in flower when grown indoors, and far larger where it grows unrestricted (rosette spread 10–20 cm (4–8 in).). It grows mostly by adding leaves, offsets or a slightly wider rosette rather than gaining height — the footprint barely changes year to year.

Is kitten tails slow or fast growing?

Kitten Tails is a slow grower. Expect many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Kitten Tails is a naturally small plant — it stays shelf- and desk-sized for its whole life, so it never becomes a space problem.

How long does kitten tails take to reach full size?

Roughly many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Light, pot size and feeding move that timeline more than anything else.

How do I keep kitten tails smaller?

You rarely need to do anything: kitten tails is so slow that it can sit in the same small pot for years. Keeping it slightly pot-bound and easing back on feed naturally caps the size. Pinch or remove the oldest, tiredest leaves so energy goes into a compact, fresh-looking plant.

How can I make kitten tails grow bigger or faster?

Move it to brighter (but not scorching) light — that is the single biggest growth lever for a small plant. A small step up in pot size every couple of years gives the roots a little more room without triggering a size jump. Feed lightly through the growing season; this plant simply will not race however hard you push it.