String of pearls vs Burro’s tail

Curio rowleyanus · Sedum morganianum

Pet safety: Burro’s tail is listed non-toxic to cats and dogs; String of pearls is toxic (pyrrolizidine alkaloids). If the two are sold under the same name, a mislabelled plant is a genuine risk in a house with animals.

Why these two get mixed up

Burro’s tail is recorded here as a pet-safe alternative to String of pearls, so the question is usually whether the swap is actually a fair one.

String of pearls (Curio rowleyanus) — **String of pearls** — Curio rowleyanus. Photograph by Agnieszka Kwiecień, Nova, Wikimedia Commons , CC BY-SA 4.0.

Burro’s tail (Sedum morganianum) — **Burro’s tail** — Sedum morganianum. Photograph by Morningdew51 at English Wikipedia, Wikimedia Commons , CC BY-SA 3.0.

	String of pearls	Burro’s tail
Scientific name	Curio rowleyanus	Sedum morganianum
Family	Asteraceae	Crassulaceae
Light floor	Bright indirect	Bright indirect
Water	12–21 days	14–28 days
Humidity floor	20%	20%
Mature height	6–36 in	6–36 in
Habit	trailing	trailing
Growth rate	moderate	slow
Difficulty	Demanding	Easy
Toxic to pets	Yes	No
Typical price	$12–35	$12–35

Highlighted cells are where the two actually differ. Everything else they share.

The differences that matter

Pet safety

This is the difference that matters most. Burro’s tail is listed non-toxic to cats and dogs; String of pearls is toxic (pyrrolizidine alkaloids). If the two are sold under the same name, a mislabelled plant is a genuine risk in a house with animals.

Difficulty

Burro’s tail scores 2 of 5, String of pearls scores 4. it looks unkillable and is not. The shallow roots rot within days in a deep wet pot, and by the time the strand shrivels the roots are already gone.

Not even related

String of pearls is Asteraceae, Burro’s tail is Crassulaceae. They share a shop label and nothing else — different families, different continents, different care.

Which should you buy?

With a cat or dog in the house, take Burro’s tail. The other is toxic, and if the shop label is wrong you will not know which you have brought home.
In a dim room, take either — both have a bright-indirect light floor.
If you forget to water, take Burro’s tail, which goes 18 days between drinks.
If it is your first plant, take Burro’s tail, at 2 of 5.
For a small shelf, take either.

Full entries

String of pearls — care fields with sources, toxicity with every authority consulted, propagation and diagnosis. Burro’s tail — the same.

Sources

This database's own care records for Curio rowleyanus and Sedum morganianum — every figure compared above.
Royal Botanic Gardens Kew, Plants of the World Online — accepted names and families for Curio rowleyanus and Sedum morganianum
ASPCA Animal Poison Control — toxicity classification for both, cited on each species entry
Photographs: Wikimedia Commons, individually credited and licensed above

Compiled and edited by Tony Valcarcel · 2026-09-12
Every comparison above is drawn from a recorded field. Where the honest distinguisher is visual we show both photographs rather than describing a leaf we have no field for. How this is sourced.