Feather Cactus (Mammillaria pulmosa) is a small, clumping cactus native to northeastern Mexico, prized for its soft, white, feathery appearance created by dense, hairlike spines. Typically forming rounded stems 2–4 inches across, it produces delicate pink to pale purple flowers in spring and summer that ring the crown of each stem. Its compact, attractive form makes it ideal for windowsills, rock gardens, and small containers.

Light

Bright light to full sun. Place where it receives several hours of direct sun daily (south- or west-facing window ideal). Provide some morning or late afternoon sun if exposed to intense midday light to avoid scorch.

Temperature & Humidity

Prefers warm temperatures: 65–85°F (18–29°C). Tolerates down to about 50°F (10°C) but keep above frost. Low humidity is best. Avoid placing in humid bathrooms or kitchens.

Watering

Water sparingly. Allow the soil to dry completely between waterings. Spring–summer (growing season): water every 2–3 weeks depending on temperature and pot size.

Soil & Potting

Use a fast-draining cactus or succulent mix. You can amend potting soil with coarse sand, perlite, or pumice (about 30–50% amendment).

Fertilizer

Feed lightly during the growing season (spring–summer) with a balanced, low-nitrogen cactus fertilizer diluted to half strength, once a month.

Growth

Handle gently — the hairy spines are soft but roots can be fragile.

Propagation

Easily propagated by offsets (pups). Allow cut surfaces to callus for a few days before planting in well-draining mix.