Lophophora williamsii

This small, spineless cactus forms soft, button-like mounds in shades of blue-green to grey-green, often developing delicate tufts of wool at the crown. Slow-growing and deeply architectural, it brings a sculptural calm to windowsills and cactus collections. In ideal conditions, mature plants may produce pale pink to white funnel-shaped flowers at the centre of each button.

Scientific Name
Lophophora williamsii (from Greek lophos – “crest/tuft” and phoros – “bearing,” referring to the woolly crown; williamsii honours British botanist C. H. Williams)

Described in 1894 by American botanist John Merle Coulter. Previously grouped within Echinocactus due to its rib structure, it was later placed in its own genus Lophophora when its spineless form, unique chemistry, and woolly areoles set it apart.

Synonyms
Echinocactus williamsii (historic)

None widely used today.

Common Name(s)
Peyote (note: used strictly as a botanical/common name; avoid cultural or ceremonial implications)

Origin
Native to arid, limestone-rich regions of northern Mexico and southern Texas.

Light
Bright, indirect light to full sun. Indoors, a south- or west-facing window is ideal. Too little light leads to elongation and loss of the plant’s natural button shape.

Water
Allow the soil to dry out completely between waterings. In spring and summer, water sparingly and deeply, then leave to fully dry. In autumn and winter, water extremely minimally – once every 4–6 weeks is often enough.

Humidity
Prefers low humidity. Keep away from bathrooms, kitchens, or damp spaces.

Soil
Use a very free-draining cactus mix with added grit, pumice, or perlite. A mineral-heavy substrate best mimics its native limestone soils.

Food
Feed lightly during the growing season every 4–6 weeks or every third water, using a low-nitrogen cactus fertiliser. Do not feed during the winter rest period.

Temp
Prefers 18–30°C in summer. Can tolerate cooler temperatures but avoid prolonged periods below 10°C. Absolutely must be kept dry in cooler months.

Pet-safe
Toxic if ingested – keep away from pets and children.

Sprouts Top Tips
This is an extremely slow-growing cactus. Overwatering is its greatest risk – when in doubt, wait another week before watering.

Extras
Lophophora species can naturally “pup,” creating clusters over many years. Markings and rib partitions may change subtly with age and water levels.

Did You Know?
In the wild, this species grows sunken into the soil, which helps protect it from grazing animals and extreme sun. Indoors, its slightly recessed growth form is a sign of good light and careful watering.