Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &
Thimble cactus - Mammillaria gracilis &

Introducing the exquisite Thimble Cactus, known as Mammillaria gracilis 'fragilis' (also referred to as Mammillaria vetula or powder puff cactus), a small, slow-growing cactus native to Central Mexico! Mammillaria is among the most highly prized cacti for its desirable traits and will be visually appealing in your very own container garden. 

This captivating little cactus boasts a cylindrical, oval body adorned with a delightful array of interwoven white spines. Belonging to the Cactaceae family, it can grow up to 6 inches tall and 4 inches wide. 

Thimble Cactus blooms in the spring and late summer to autumn. These cactus plants have delicate white and creamy yellow flowers.ThisMammillariaplant is fast-growing and would look great in a variety of settings. According to ASPCA, thimble cactus is not known to be poisonous to humans or pets. Thimble Cactus can be propagated with ease from offsets.

Overall, the Thimble Cactus is a low-maintenance plant that is easy to care for and can add a unique touch to any indoor or alpine trough garden. With the right growing conditions and care, the cactus can thrive and produce beautiful flowers year after year. 

Watering Needs 

The Mammillaria Gracilis Fragilis is a cactus that requires little water. Keep in mind that cacti can survive for a long time without water because they have developed the ability to store it. You don't need to water the thimble cactus until the soil is completely dried out, even in the summer when it is actively growing. It is important to let the soil dry out completely between waterings to prevent overwatering, which can cause the roots to rot. 

In the dormant winter period, this mammillaria should be given a period of rest and watered even less frequently, only when the soil is completely dry. It is important to use a well-draining soil mix and a pot with drainage holes to prevent water from accumulating at the bottom of the pot. 

If the Mammillaria cactus is placed in full sun, it may only need to be watered once or twice a week; if it is indoors, it may require even less. Overwatering is the most common cause of death in cacti, so it is important to be cautious when watering the Mammillaria Gracilis Fragilis. 

Light Requirements 

Providing enough light for these desert cacti is one of the most important aspects of their care. It is important to grow Mammillaria fragilis in areas that receive at least 4-6 hours of bright, direct light every day to keep them happy, but too much can cause sunburn and damage to the thimble cactus. 

If indoors, place your thimble cactus directly in front of a west- or south-facing window. If they don't receive enough light, their stems may grow leggy and become paler, and their spines will shorten; so, make your cactus happy and give it plenty of light. During the winter months, the plant should be given a period of rest and moved to a cooler location with less light. 

Optimal Soil & Fertilizer Needs 

The thimble cactus prefers a well-draining cactus potting soil that is specifically formulated for cacti. Planet Desert specializes in succulents and has specialized cactus potting soil that includes an organic substrate with mycorrhizae to help with the growth of a healthy root system to help your cactus thrive. It is important to use a pot with drainage holes to prevent water from accumulating at the bottom of the pot. The soil should be allowed to dry out completely between waterings to prevent overwatering, which can cause the roots to rot. 

Fertilizer is not necessary for the Mammillaria Gracilis Fragilis, but providing a small amount of fertilizer during the growing season can be beneficial. Natural fertilizer can be applied once a year with an equal ratio of 5-10-5 (NPK). It is important not to over-fertilize, as this can cause damage to the thimble cactus. If the thimble cactus is not growing or appears unhealthy, it may be a sign of over-fertilization or other issues, such as overwatering or inadequate light. 

Hardiness Zones & More 

The thimble cactus is hardy in USDA hardiness zone 9-11. It prefers warm temperatures between 60-80°F. The cactus can tolerate high temperatures, but it should be protected from frost and freezing temperatures. 

The Mammillaria Gracilis Fragilis prefers low humidity and should be kept in a dry environment. High humidity can cause the Mammillaria cactus to rot and develop fungal diseases. It is important to provide good air circulation around the plant to prevent moisture from accumulating on the leaves and stems. 

We think you will love this cactus order your very own Mammillaria gracilis 'Fragilis today and start enjoying its beauty in no time! 

Bloom Season Spring, late summer
Botanical Name Mammillaria gracilis fragilis
Common Name Thimble cactus, Mammillaria vetula, powder puff cactus
Dormancy Winter
Family Cactaceae
Flower Color White, yellow
Genus Mammillaria
Growth Habit Clumping
Growth Rate Fast
Hardiness Zone 9, 11
Mature Size 6 in. tall, 4 in. wide
Native Area Central Mexico
Plant Type Perennial cactus
Propagation By offsets
Resistance Drought tolerant, heat resistant, deer resistant, pest resistant
Soil PH 6.5, Acidic, Neutral
Soil Type specialized cactus potting soil
Special Features Unique foliage
Sun Exposure Full sun, partial shade
Toxicity Safe for humans, friendly to dogs, friendly to cats
Watering Needs Low

Pests & Common Problems of Thimble Cactus

Thimble cacti are generally low-maintenance cactus plants, but they can still face a few common problems. One of the most common pests that can affect thimble cacti is mealybugs. These small, white insects can infest the plant and cause damage by sucking sap from the cactus. 

Additionally, overwatering can lead to root rot in thimble cacti, so it's important to ensure proper drainage and avoid excessive watering. 

FAQs - Thimble Cactus Plant

How do you take care of a thimble cactus? 

Proper care of the thimble cactus involves watering it thoroughly, allowing the soil to dry out between waterings. Provide bright sunlight for at least 4-6 hours daily and protect it from direct sunlight.  

Use a well-draining soil mix and avoid heavy clay-based soils. Keep the plant in a warm, dry environment with low humidity in USDA zones 9-11 and protect it from frost and freezing temperatures. Regularly check for pests and adjust care accordingly. Wear gloves and keep cacti out of reach of pets and children. 

How big does a thimble cactus get? 

The Mammillaria Gracilis Fragilis, also known as the thimble cactus, is a small cactus that typically grows to be around 6 inches in height and 4 inches in diameter. However, it can grow up to 12 inches in height under ideal light, and temperature.  

Their compact size makes them ideal for indoor gardening or small outdoor spaces. These cacti feature cylindrical stems covered in spines and produce beautiful pink or white flowers when they bloom. 

Is the thimble cactus poisonous? 

The Mammillaria Gracilis Fragilis, or thimble cactus, is not known to be poisonous to humans or pets, according to ASPCA. However, it is always a good idea to keep cacti out of reach of pets and children, as their spines can cause injury. If ingested, the spines can also cause irritation or injury to the mouth and digestive tract. 

Why is my thimble cactus turning yellow? 

Yellowing of the Mammillaria Gracilis Fragilis, or thimble cactus, can result from overwatering, underwatering, inadequate light, and nutrient deficiency. Overwatering causes roots to rot, while underwatering causes dehydration. Inadequate light and nutrient deficiency can cause stunted growth. To determine the cause, check soil moisture, light exposure, and nutrient levels, and adjust care accordingly.

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Thimble cactus - Mammillaria gracilis 'fragilis'

sku: 89

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Regular price$ 9.89
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Please note: All Landscape Ready plants that are in a 6-inch pot or larger WILL NOT come with a pot as it will be shipped bare root.

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Please note: Our large plants are many years old, and as a result, they might have minor scaring but will arrive 100% healthy and looking great.

Please note: Our large plants are shipped bare root. They are also many years old, and as a result, they might have minor scaring but will arrive healthy and looking great.

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Detailed description of this plant is below...

If you live in a cold climate and are expecting temperatures below 40 degrees within the next five days after placing your order, we highly recommend adding a heat pack to your order. If you do not order a heat pack, we do not send one with your order.

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Plants that are in 3.5" pots and smaller will be shipped in its pot to prevent any damage to the roots.

Any plant that is 6" and larger WILL NOT come with a pot as it will be shipped bare root.

Depending on the species and season, you will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase.

We ship via USPS Priority Mail, If you don't get Free Shipping, then we calculate the shipping cost based on the weight and volume of your purchase.

Care instructions are included in every package you order. Please allow us up to 3 business days to process your order. Depending on your location, we will ship the plants on a certain day to avoid transit time during weekends or holidays. If you wish to receive your order on a specific date, or have special instructions, please add a note on your order. If you have any questions or comments, please feel free to contact us at any time.

  • Description
  • Key Plant Features

Introducing the exquisite Thimble Cactus, known as Mammillaria gracilis 'fragilis' (also referred to as Mammillaria vetula or powder puff cactus), a small, slow-growing cactus native to Central Mexico! Mammillaria is among the most highly prized cacti for its desirable traits and will be visually appealing in your very own container garden. 

This captivating little cactus boasts a cylindrical, oval body adorned with a delightful array of interwoven white spines. Belonging to the Cactaceae family, it can grow up to 6 inches tall and 4 inches wide. 

Thimble Cactus blooms in the spring and late summer to autumn. These cactus plants have delicate white and creamy yellow flowers.ThisMammillariaplant is fast-growing and would look great in a variety of settings. According to ASPCA, thimble cactus is not known to be poisonous to humans or pets. Thimble Cactus can be propagated with ease from offsets.

Overall, the Thimble Cactus is a low-maintenance plant that is easy to care for and can add a unique touch to any indoor or alpine trough garden. With the right growing conditions and care, the cactus can thrive and produce beautiful flowers year after year. 

Watering Needs 

The Mammillaria Gracilis Fragilis is a cactus that requires little water. Keep in mind that cacti can survive for a long time without water because they have developed the ability to store it. You don't need to water the thimble cactus until the soil is completely dried out, even in the summer when it is actively growing. It is important to let the soil dry out completely between waterings to prevent overwatering, which can cause the roots to rot. 

In the dormant winter period, this mammillaria should be given a period of rest and watered even less frequently, only when the soil is completely dry. It is important to use a well-draining soil mix and a pot with drainage holes to prevent water from accumulating at the bottom of the pot. 

If the Mammillaria cactus is placed in full sun, it may only need to be watered once or twice a week; if it is indoors, it may require even less. Overwatering is the most common cause of death in cacti, so it is important to be cautious when watering the Mammillaria Gracilis Fragilis. 

Light Requirements 

Providing enough light for these desert cacti is one of the most important aspects of their care. It is important to grow Mammillaria fragilis in areas that receive at least 4-6 hours of bright, direct light every day to keep them happy, but too much can cause sunburn and damage to the thimble cactus. 

If indoors, place your thimble cactus directly in front of a west- or south-facing window. If they don't receive enough light, their stems may grow leggy and become paler, and their spines will shorten; so, make your cactus happy and give it plenty of light. During the winter months, the plant should be given a period of rest and moved to a cooler location with less light. 

Optimal Soil & Fertilizer Needs 

The thimble cactus prefers a well-draining cactus potting soil that is specifically formulated for cacti. Planet Desert specializes in succulents and has specialized cactus potting soil that includes an organic substrate with mycorrhizae to help with the growth of a healthy root system to help your cactus thrive. It is important to use a pot with drainage holes to prevent water from accumulating at the bottom of the pot. The soil should be allowed to dry out completely between waterings to prevent overwatering, which can cause the roots to rot. 

Fertilizer is not necessary for the Mammillaria Gracilis Fragilis, but providing a small amount of fertilizer during the growing season can be beneficial. Natural fertilizer can be applied once a year with an equal ratio of 5-10-5 (NPK). It is important not to over-fertilize, as this can cause damage to the thimble cactus. If the thimble cactus is not growing or appears unhealthy, it may be a sign of over-fertilization or other issues, such as overwatering or inadequate light. 

Hardiness Zones & More 

The thimble cactus is hardy in USDA hardiness zone 9-11. It prefers warm temperatures between 60-80°F. The cactus can tolerate high temperatures, but it should be protected from frost and freezing temperatures. 

The Mammillaria Gracilis Fragilis prefers low humidity and should be kept in a dry environment. High humidity can cause the Mammillaria cactus to rot and develop fungal diseases. It is important to provide good air circulation around the plant to prevent moisture from accumulating on the leaves and stems. 

We think you will love this cactus order your very own Mammillaria gracilis 'Fragilis today and start enjoying its beauty in no time! 

Bloom Season Spring, late summer
Botanical Name Mammillaria gracilis fragilis
Common Name Thimble cactus, Mammillaria vetula, powder puff cactus
Dormancy Winter
Family Cactaceae
Flower Color White, yellow
Genus Mammillaria
Growth Habit Clumping
Growth Rate Fast
Hardiness Zone 9, 11
Mature Size 6 in. tall, 4 in. wide
Native Area Central Mexico
Plant Type Perennial cactus
Propagation By offsets
Resistance Drought tolerant, heat resistant, deer resistant, pest resistant
Soil PH 6.5, Acidic, Neutral
Soil Type specialized cactus potting soil
Special Features Unique foliage
Sun Exposure Full sun, partial shade
Toxicity Safe for humans, friendly to dogs, friendly to cats
Watering Needs Low

Pests & Common Problems of Thimble Cactus

Thimble cacti are generally low-maintenance cactus plants, but they can still face a few common problems. One of the most common pests that can affect thimble cacti is mealybugs. These small, white insects can infest the plant and cause damage by sucking sap from the cactus. 

Additionally, overwatering can lead to root rot in thimble cacti, so it's important to ensure proper drainage and avoid excessive watering. 

FAQs - Thimble Cactus Plant

How do you take care of a thimble cactus? 

Proper care of the thimble cactus involves watering it thoroughly, allowing the soil to dry out between waterings. Provide bright sunlight for at least 4-6 hours daily and protect it from direct sunlight.  

Use a well-draining soil mix and avoid heavy clay-based soils. Keep the plant in a warm, dry environment with low humidity in USDA zones 9-11 and protect it from frost and freezing temperatures. Regularly check for pests and adjust care accordingly. Wear gloves and keep cacti out of reach of pets and children. 

How big does a thimble cactus get? 

The Mammillaria Gracilis Fragilis, also known as the thimble cactus, is a small cactus that typically grows to be around 6 inches in height and 4 inches in diameter. However, it can grow up to 12 inches in height under ideal light, and temperature.  

Their compact size makes them ideal for indoor gardening or small outdoor spaces. These cacti feature cylindrical stems covered in spines and produce beautiful pink or white flowers when they bloom. 

Is the thimble cactus poisonous? 

The Mammillaria Gracilis Fragilis, or thimble cactus, is not known to be poisonous to humans or pets, according to ASPCA. However, it is always a good idea to keep cacti out of reach of pets and children, as their spines can cause injury. If ingested, the spines can also cause irritation or injury to the mouth and digestive tract. 

Why is my thimble cactus turning yellow? 

Yellowing of the Mammillaria Gracilis Fragilis, or thimble cactus, can result from overwatering, underwatering, inadequate light, and nutrient deficiency. Overwatering causes roots to rot, while underwatering causes dehydration. Inadequate light and nutrient deficiency can cause stunted growth. To determine the cause, check soil moisture, light exposure, and nutrient levels, and adjust care accordingly.

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