Mammillaria Gracilis Fragilis Monstrose ‘Arizona Snowcap’ Care & Buying Guide


Light requirementsMedium
Water requirementsLow
Ease of careEasy
Zone9a to 11b
Temperature resistanceMildly frost-hardy
Growth speedFast
Indoor growingSuitable


Taking Care Of Mammillaria Gracilis Fragilis Monstrose ‘Arizona Snowcap’

Ideal conditions

Requiring partial sun, Mammillaria Gracilis Fragilis Monstrose ‘Arizona Snowcap’ is fairly easy to grow both indoors and outdoors. It is also relatively frost-hardy (survives in minimum 20 to 25 F/-6.7 to -3.9 C), though it shouldn’t be exposed to low temperatures for a long time. 


The Arizona Snowcap cactus requires very little water. Throughout spring and summer months, you should water it only when its soil feels dry to the touch. Overwatering is very likely to cause root rot in this cactus.

In winter, you should suspend watering the Arizona Snowcap cactus. In colder months, the cactus goes into a dormant state and requires very little water. You may keep it completely dry, or you may very lightly mist it. But be very careful with the water supply since root rot is much easier to cause in winter than in summer.

Where to plant

Since the Arizona Snowcap dislikes standing water, it should be planted in a light, fast-draining cactus mix. The soil may also have 70-80% mineral grit like perlite or pumice for improved drainage.

If planting the cactus in a pot, make sure that it has large draining holes to again encourage drainage.

The Arizona Snowcap can be kept both indoors and outdoors. If winters in your area are cold, then don’t plant this cactus in garden soil – instead, plant it in a pot so that you can easily move the cactus inside during cold winter months.

The Arizona Snowcap cactus prefers filtered or partial sun. It’s not particularly heat-resistant, so you should take extra care to protect it from direct sunlight on hotter days.

If keeping the cactus inside, make sure to place it on a sunny window sill, but again make sure to protect it from the heat on hot days. 

General care information

For best results, fertilize the Arizona Snowcap during the growing season (spring and summer) with a cacti fertilizer mix. The fertilizer should be rich in potassium and phosphorus. Since this is a small plant, dilute to fertilizer in water to around half strength, but if your fertilizer mix has a different preparation process, follow it instead.

Depending on the fertilizer mix, you should fertilize the Arizona Snowcap once every 4-8 weeks, perhaps even rarer.

Repot the Arizona Snowcap when you feel that it has outgrown its pot, but do so preferably every season so that you can take a look at the condition of the roots. Perform repotting preferably during the warmer months. Before repotting, allow the soil to dry so that you can more easily remove the plant from its old pot.

Inspect the roots of the cactus and remove any rotted or dead roots. Treat cuts with fungicide as well. After repotting, don’t water the plant for about a week or so to allow it to recover.