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Also known as
Mystax and Mamillaria mystax
Taxonomy
Mammillaria mystax
Mammillaria
Cactaceae
Caryophyllales

How to care for Cactus Mystax
How often to water your Cactus Mystax

every 12
Cactus Mystax needs 0.5 cups of water every 12 when it doesn’t get direct sunlight and is potted in a 5" pot.
Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.
Water 0.5 cups every
12
Finding light for Cactus Mystax in your home

a window
Cactus Mystax love being close to bright, sunny windows 😎.
Place it less than 1ft from a south-facing window to maximize the potential for growth.
Cactus Mystax does not tolerate low-light 🚫.
Select your region to see how the current weather in your area affects the placement of Cactus Mystax in your home 🏡.
How to fertilize Cactus Mystax

Most potting soils come with ample nutrients which plants use to produce new growth.
By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.
To replenish this plant's nutrients, repot your Cactus Mystax after it doubles in size or once a year—whichever comes first.
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Should i try to re pot? She is so out of control lol i used to pick them off but just gave up. Its very top heavy n im worried she’ll get blown over. Any hints on dividing or anythings welcome #PropagationStation #Mammillaria #HappyPlants #NewGrowth #
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Is this a sign of root rot? If so, what are some remedies for this? #Mammillaria
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Is my cactus labeled properly #Mammillaria
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How often should i water it and how much water should i give it? What pot is best for this plant? #Mammillaria
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How much water does it need #Mammillaria
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It was green and is now turning yellow / orange. It was in a window with direct light and started changing and I moved away from window to grow light. What is going on? #Mammillaria
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Unsolicited #PSA ! Just because a #cactus is densely spined, it is NOT immune to mealies! In moving this #mammillaria back to school and viewing it in more focused light, I noticed a small infestation that I had been missing. It is so easy to spot #mealybugs on gymnos and echinopsis, but I tend to take these mams for granted when doing #pest checks. Don't neglect the nips! #cactusclique #succulentsquad #plantsmakepeoplehappy #plantaddict #happyplants #deathtomealies
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Met a local cacti grower today, he gifted me so many plants I was so shocked I nearly cried in front of him. I know he was giving them away anyway but it still sits with me how beautiful he is for doing so. My collection was really lacking in the cacti department. From nepenthes and astros to Mammillaria and Notocactus I was truly spoilt. There’s 3 pages of pictures 🫨 #HappyPlants #PlantsMakePeopleHappy #PlantAddict #SucculentLove #CactusClique #cactus #CarnivorousPlants #VenusFlytraps #nepenthes #GoldenBarrelCactus #notocactus #Mammillaria #EasterCactus #LithopsArmy
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I really think that Anthrax is a Mammillaria, but not sure which species? No flowers as of yet and the ridges sort of slant, but not a lot. Thoughts? #mammillaria #cactusclique #identify
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Why is mine malting? #Mammillaria
Cactus Mystax thrives in dry soil and should be watered sparingly. Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.
☀️ Sunlight Needs
Cactus Mystax requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.
🐶 🐈 👶 Toxicity
Greg does not have confirmed data on this plant’s toxicity. If you, a family member, or a pet consumes plant material of unknown toxicity, it’s always best to consult a medical professional.
If you or someone else ingested this plant, call Poison Control at US (800) 222-1222. If a pet consumed this plant, contact your veterinarian or the ASPCA at US (888) 426-4435.
💨 Humidity
Cactus Mystax enjoys lots of humidity. Provide humidity for your plant by watering regularly and thoroughly, since plants absorb most water through their root system rather than their leaves. They may also benefit from being placed next to a humidifier.
🪴 Soil
Cactus Mystax is very sensitive to wet soil, so choose a potting soil that drains very well and doesn’t retain too much moisture. A good soil will have lots of perlite or vermiculite for drainage and some organic matter for nutrition. A few handfuls of perlite added to regular store-bought cactus soil will do the trick!
💩 Fertilizer
Cactus Mystax grows very slowly and doesn’t require added fertilizer. Replacing your plant’s potting soil once a year should provide them with more than enough nutrition. Remember, plants get their energy from sunlight, not fertilizer!
❄️ Dormancy
It’s common for Cactus Mystax to go dormant in the wintertime and you may notice their growth slow down. Waterings should be spaced out more during this time.
🌎 Native Region
Cactus Mystax is native to the Southwestern United States, Central America, and the Caribbean.
🌸 Flowers
Cactus Mystax produces flowers in the wild, but does not flower when kept as houseplants.
🧐 Troubleshooting
When troubleshooting a sad-looking houseplant, start by checking for signs of distress in its leaves, such as yellowing, browning, or drooping, which can indicate overwatering or nutrient deficiencies.
Inspect the soil moisture; too dry or too wet soil can cause problems.
Ensure the plant is getting the right amount of light, as too much or too little can stress it.
Finally, consider environmental factors like temperature and humidity, and adjust care routines accordingly to revive your plant.
Care Summary for Cactus Mystax
Cactus Mystax
Greg recommends:

0.5 cups every 12 days

< 1ft from a window

Repot after 2x growth
Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.
