Description
Mammillaria gracilis [mam-mil-AR-ee-uh, GRASS-il-is] is an attractive succulent native to Central Mexico.
The Mammillaria plant genus has around 300 species of highly variable forms.
A highly prized cactus succulent among collectors and gardeners, Mammillaria gracilis fragilis is loved for their desirable traits in cultivation, visually appealing appearance and are generally treated as houseplants.
These unique cacti are small in height, but since they grow in a cluster they add color and beauty to your garden experience.
Commonly known as thimble cactus, mammillaria gracilis fragilis – or mammillaria vetula – features creamy yellow flowers.
While the bloom time of these succulents is summer, expect to see lovely and eye-catching yellow flowers in winter as well.
Besides being called thimble cactus, mammillaria gracilis is generally known by the common names:
- Powder Puff
- Powder Puff Pincushion
How to grow Thimble Cactus Mammillaria
From the very first day, you will see that Mammillaria gracilis a.k.a. the thimble cactus is a delight to have around. Like most species of cacti, this small ornamental is also super easy to grow and care for.
You can basically find the perfect spot for this cactus and let it take care of its well-being on its own. However, you will still have to pay a little attention to some of its basic needs. Let’s see what is there to know!
There is no surprise that Mammillaria gracilis thrives in as much sunlight as it can get. For optimal growth, place this cactus in a spot where it can receive between 4 and 6 hours of direct sunlight daily. Indoors, the best location for this buddy would be near a south or east-facing window.
When it doesn’t get enough sunlight, the thimble cactus can become leggy. If you live in an area with warm summers, you can move your cactus outdoors during the warm summer months. This sun-loving buddy will really appreciate the natural light, but it is important to provide it with shelter from the rain.
Temperature-wise, Mammillaria gracilis is hardy in USDA zones 8 to 10. It grows at its best in temperatures that range from 70 to 80 °F (21-27 °C) almost all year round. The temperature is not as important as long it remains on the warmer side.
During the winter, Mammillaria gracilis goes dormant and does not handle cold weather very well. When the temperatures drop to 60 to 65 °F (15-18 °C), this cactus is usually more likely to surprise you with lovely flowers.
Mammillaria gracilis will encounter problems with pests and fungal diseases only in case of excessive watering. We recommend you stick to the recommended watering routine and check your cactus for any signs of rot, which often appears as black spots around its base.
On the other hand, some pests that may bother your cactus include spider mites, scale insects, and fungus gnats. If you notice any of these intruders, you can control their spread by using a diluted rubbing alcohol solution.
How to care for Thimble Cactus Mammillaria
Thimble Cactus Flowers
A beautiful, small cactus with a cylindrical body, Mammillaria produces small yellow or white flowers, often found in a halo or circular shape what some call the flower crown effect.
For better flowering, allow plants to enjoy a cooling period in winter.
During this time, suspend watering altogether.
Unlike other cactus, the Mammillaria has tubercles from which the flowers emerge from the axle of these tubercles.
Light Conditions & Temperature
Thimble cactus thrives in full sun and bright light.
Even though most Mammillaria species prefer strong light, some cannot survive more than four hours of direct sunlight.
This small cactus grows well in temperatures between 70° and 80° degrees Fahrenheit (21° – 27° C) and become dormant in winter.
During the winter, keep colorful potted cactus plants on a windowsill as houseplants.
When the temperatures drop to somewhere between 60° and 65° degrees Fahrenheit (15° – 18° C), the plant will bear flowers.
Move the plant outside during the summertime for the best results as the season marks its bloom time.
They survive well in USDA hardiness zones 8 to 10.
Watering and Feeding
In the winter, when the plant turns dormant, suspend water. However, mist occasionally.
For the rest of the season, water thimble cactus plants thoroughly.
Between waterings, allow the soil mix to become completely dry.
Don’t expose the plant to prolonged dampness or let it sit in water for long periods.
For feeding, fertilize the plant with a cactus fertilizer mix during the growing seasons.
In the dormant winter period, suspend the feeding as well.
Best Soil Type for Mammillaria Cactus
The plant requires porous cactus soil and grows well in a rich, fast-draining cactus soil mix with a pH range between 6.1 and 6.5.
Some plant types will require a gritty succulent or cactus potting soil for the best results.