Mature size & growth rate

How big does Burro's tail (Sedum morganianum) get?

Also called donkey tail, horse tail, lamb tail.

About Burro's tail

Sedum morganianum · also called donkey tail, horse tail · houseplant

Burro's tail is a Mexican trailing succulent with plump blue-green leaves arranged in dense braided strands. Leaves drop at the slightest touch, so it is best kept where it will not be brushed. Pet-safe and drought-tolerant.

Sedum morganianum (Crassulaceae), native to southern Mexico, recorded wild on vertical igneous cliffs in ravines of central Veracruz within tropical deciduous forest, an origin that explains its pendulous, hanging habit.

Stems start upright then become pendulous to several feet; the bean-shaped leaves carry a powdery epicuticular wax bloom that cuts moisture loss and are extremely fragile, dropping at the lightest touch, so site it away from traffic and handle minimally.

Mature size: 60-90 cm trailing

Sources: hort.extension.wisc.edu, plants.ces.ncsu.edu, en.wikipedia.org

Indoor size vs how big it gets in the wild

Burro's tail does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims. Indoors and in a pot, expect 60-90 cm trailing. 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.

Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Growth rate and years to mature

Burro's tail 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: quarter-strength succulent feed every 6-8 weeks in spring and summer.

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

How to keep burro's tail smaller

You are not stuck with the maximum size. For burro's tail specifically, these are the levers, in order of impact:

Trim the longest vines back to the length you want — burro's tail takes hard cutting well and bushes out from the cut.
Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser.
The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants.
A trim once or twice a season is usually enough to hold its length.

The keep-it-smaller method, step by step

Decide the length you want. Pick the point each vine of burro's tail should stop — you can be aggressive; it regrows readily.
Cut just above a node. Snip about 0.5 cm above a leaf node so the stem branches there instead of dying back.
Root the cuttings. Drop the trimmed pieces in water or mix — they root in 2-4 weeks and can fill the same pot for a bushier look.
Repeat as it runs. Re-trim whenever it overshoots; regular light pruning keeps it both smaller and fuller.

How to grow burro's tail bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for burro's tail the accelerators are:

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth.
Give it something to climb — many vines grow far faster and bigger up a support than trailing.
Feed through spring and summer and keep it consistently watered while it is actively running.

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

When burro's tail outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for burro's tail:

Vines pooling on the floor or wrapping past where you want them — purely a trimming cue, not a repot one.
Bare, leggy stems with leaves only at the tips (usually a light problem, not a size one).
A tangled mass that has outrun its support and needs cutting back and re-training.

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

Burro's tail size — frequently asked questions

How big does burro's tail get?

Burro's tail reaches 60-90 cm trailing when grown indoors. Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Is burro's tail slow or fast growing?

Burro's tail is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Burro's tail does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims.

How long does burro's tail 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 burro's tail smaller?

Trim the longest vines back to the length you want — burro's tail takes hard cutting well and bushes out from the cut. Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser. The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants. A trim once or twice a season is usually enough to hold its length.

How can I make burro's tail grow bigger or faster?

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth. Give it something to climb — many vines grow far faster and bigger up a support than trailing. Feed through spring and summer and keep it consistently watered while it is actively running.