How to care for Thelocactus macdowellii
How often to water your Thelocactus macdowellii
Thelocactus macdowellii needs 0.5 cups of water every 12 when it doesn’t get direct sunlight and is potted in a 5" pot located in Baltimore, Maryland.
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
Check the growing potential in your area
A plant's growing potential is determined from its location, the time of year, and current local weather.
Finding light for Thelocactus macdowellii in your home
Thelocactus macdowellii love being close to bright, sunny windows 😎.
Place it less than 1ft from a south-facing window to ensure it receives enough light to survive during this time of reduced sunlight intensity in Baltimore, Maryland ⛅.
Thelocactus macdowellii does not tolerate low-light 🚫.
How to fertilize Thelocactus macdowellii
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 Thelocactus macdowellii after it doubles in size or once a year—whichever comes first.
Thelocactus macdowellii 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.
Thelocactus macdowellii 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 🏡.
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.
Thelocactus macdowellii prefers dry environments. Providing extra humidity or misting your plant allows water to linger on leaves, which can create the perfect environment for harmful types of fungi.
Thelocactus macdowellii 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!
Thelocactus macdowellii 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!
Thelocactus macdowellii is native to Mexico.
Thelocactus macdowellii produces flowers in the wild, but does not flower when kept as houseplants.
Care Summary for Thelocactus macdowellii
0.5 cups every 12 days
< 1ft from a window
Repot after 2x growth
Based on your location in Baltimore, Maryland, the 4” pot your plant is in, and that it doesn’t get direct sunlight.