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Thimble Cactus

Mammillaria vetula, Cactaceae

Sources last read 14 September 2026.

Not yet rated How forgiving it is has not been judged here yet.

Also called Thimble mammillaria.

Thimble Cactus (Mammillaria vetula), the whole plant.
Agnieszka Kwiecień, Nova, CC BY-SA 4.0 · Wikimedia Commons

Toxicity is partly unassessed

  • Not assessed for cats. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for dogs. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for people. NC State Extension publishes no harm statement for this plant. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.

What the sources say about its care

Light
Full sun, Partial Shade
NC State Extension · read 13 September 2026
Water
Good Drainage, Occasionally Dry
NC State Extension · read 13 September 2026
Humidity

No source read publishes a humidity figure for any plant on this site. What follows is general guidance for foliage plants.

Most foliage plants prefer more humidity than a heated room gives; succulents are named as an exception
Penn State Extension · read 13 September 2026
Soil
Loam (Silt), Sand, Shallow Rocky; pH Acid (<6.0), Neutral (6.0-8.0)
NC State Extension · read 13 September 2026
Toxic to cats
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Toxic to dogs
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Harmful to people
No record of poisoning in people is listed for this plant; that absence is not evidence it is safe.
NC State Extension · read 13 September 2026

Routine care

Watering
It is drought tolerant; let the soil dry fully between waterings. In winter stop watering and move it somewhere colder to encourage spring flowers.
NC State Extension · read 13 September 2026
Repotting
Repot roughly every 2 to 3 years, or when it grows too big for its pot.
NC State Extension · read 13 September 2026
Propagation
Offsets, stem cuttings and seeds can all be used to propagate it.
NC State Extension · read 13 September 2026
Pests and diseases
Can be troubled by scale insects and mealybugs.
NC State Extension · read 13 September 2026

Move something and watch

Loading the simulator. It needs JavaScript; the care table above does not.

Flowers of Thimble Cactus (Mammillaria vetula).
FlowersAgnieszka Kwiecień, Nova, CC BY-SA 4.0 · Wikimedia Commons

About the plant

Mammillaria vetula, the thimble cactus, is a species of nipple cactus in the subfamily Cactoideae. It is native to the Mexican states of Hidalgo, Guanajuato and Querétaro. Two subspecies are recognized M. vetula subsp. vetula and M. vetula subsp. gracilis. While the former is usually considered too plain to be grown as an ornamental plant, the latter is one of the most widespread mammillarias in cultivation.

From Wikipedia, CC BY-SA 4.0 · read 13 September 2026

Native range
Mexico (Guanajuato to Veracruz)
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Mexico
NC State Extension · read 13 September 2026
Climate
desert or dry shrubland
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Growth form
succulent subshrub
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Perennial, Succulent; habit clumping, columnar
NC State Extension · read 13 September 2026
Size
Height 3–6 in; width 3–6 in
NC State Extension · read 13 September 2026
Flowering
Flowers gold/yellow; blooms in spring, summer
NC State Extension · read 13 September 2026
Uses

What sources record people using this plant for. A traditional or medicinal use listed here is a record of use, not advice to eat it or treat anything with it.

It has been used for respiratory problems, fever and inflammation.
NC State Extension · read 13 September 2026

More of the Cactaceae family

Plants with similar care

Sources

What this does not cover

The figures above are what published sources say, not measurements of the plant in your room. They say nothing about your pot size, your water, the season, or how far from the glass the plant stands, and those decide more than any figure here does.

Humidity has no species figure because no source read for this site publishes one, and the only temperature published for this plant is a cold floor. The simulator fills those gaps with general figures for its kind of plant, marked as general and listed on how we read sources. Where a toxicity row says the plant was not assessed, that is the absence of a finding and not a finding of safety.

If something is already wrong, the diagnosis tool asks about the soil, the window and the watering, which is where the answer usually is.