Feather cactus

Feather cactus key facts

Growing Difficulty

Intermediate

Lifespan

Perennial (little published data on lifespan)

Size

Stems 4-7 cm tall and wide; mounds up to 40 cm across

Watering

A little fertiliser in the summer growing season

Light & Placement

In summer give full sun or light shade. Keeping it out of the rain keeps the white spines clean.

Watering

Cacti are grown much like summer-growing succulents. Water regularly in summer, pouring onto the soil so the spines stay dry and clean. Do not let the soil get too dry in winter either.

Temperature & Overwintering

Winter it in a bright, frost-free spot, and do not let the soil stay cold and wet for long.

Soil & Repotting

It is rot-prone, so use a well-drained mix; roots are easily lost in pots that stay damp.

Propagation

It takes a few years to start offsetting but can then fill a 25 cm pot within a few years. Offsets root quickly as cuttings; it can also be grown from seed.

Pests & Cautions

It is prone to root rot and easily loses its roots in pots that stay damp, so be especially careful with overwatering. Water on the spines leaves them looking dingy.

About Feather cactus

White Star (Mammillaria), the feather cactus, is covered in soft, feathery white spines. Stems reach 4 to 7 cm tall and wide, and clumps can spread up to 40 cm. Care tips for intermediate growers inside.

7 things to know before growing Feather cactus

1. 1For intermediate growers

   The feather cactus is rated for intermediate growers. Trapped moisture among the spines and overwatering are the usual causes of trouble, so get the basics of placement and watering right from the start.

2. 2Bright light, good airflow

   It prefers a bright spot, and too little light can make the stem stretch and lose its neat shape. Good airflow keeps moisture from lingering among the spines. If the midsummer sun looks too harsh, move it to bright partial shade.

3. 3Water at the base

   Water trapped among the spines can cause rot, so avoid wetting the plant itself and pour water onto the soil along the pot's edge. Wait until the soil has dried out completely, since overwatering can lead to root rot.

4. 4Fast-draining soil

   Mix a commercial cactus and succulent soil with gritty material such as pumice or coarse sand to improve drainage. A breathable unglazed terracotta pot helps the soil dry out faster and makes watering easier to manage.

5. 5When to repot

   Repot roughly every one to two years, or when the pot is full. Do it in the warm growing season and wait a few days before watering so any damaged roots can dry and settle. Holding the plant in folded newspaper keeps your hands off the delicate spines.

6. 6Seasonal care

   Treat it like a summer-growing succulent. In summer, keep it in sun or bright partial shade and water regularly, pouring onto the soil at the base so the spines stay dry, with good airflow to prevent stuffiness. In winter, keep it in a bright place away from frost; don't let the soil dry out too much, but don't let it stay cold and wet for long either.

7. 7Choosing a healthy plant

   Look for a plant whose white spines cover the body evenly and whose base feels firm. Avoid stems that are soft or discolored, or bases that are turning black. Check the listing photos and the grower's description for the size of the plant and how its offsets are growing.

Frequently asked questions about Feather cactus

Q.Do the spines hurt when touched?

A.The spines are soft and generally not painful to touch. They can get matted or dirty easily, though, so it is best to hold the pot rather than the plant.

Q.Can beginners grow it?

A.It is rated for intermediate growers. Because it dislikes overwatering and stuffy conditions, beginners should provide bright light and good airflow, and get in the habit of checking that the soil is dry before watering.

Q.How big does it get?

A.The stem measures 4 to 7 cm in both height and diameter. As offsets form and it grows into a clump, it can reach 40 cm across. Repot into a larger pot as the clump grows.

Q.How often should I water it?

A.Rather than following a fixed schedule, water only after the soil has dried out completely. Apply water at the base rather than over the plant, and go easy in humid weather and in winter.

Q.Can I grow it indoors?

A.A bright, sunny windowsill can work, but low light makes the stem stretch. Stagnant air encourages rot among the spines, so open the window from time to time or otherwise keep the air moving.

Handy Growing Tools for Feather cactus

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