Blue Columnar Cactus
4.6 out of 5 (65 experiences)
Also known as
San Diego Cactus and Pilosocereus azureus
How to care for Blue Columnar Cactus
How often to water your Blue Columnar Cactus
Blue Columnar Cactus 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
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.
Select a city to check sunlight intensity
Finding light for Blue Columnar Cactus in your home
Blue Columnar Cactus love being close to bright, sunny windows 😎.
Place it less than 1ft from a south-facing window to maximize the potential for growth.
Blue Columnar Cactus does not tolerate low-light 🚫.
Select your region to see how the current weather in your area affects the placement of Blue Columnar Cactus in your home 🏡.
How to fertilize Blue Columnar Cactus
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 Blue Columnar Cactus after it doubles in size or once a year—whichever comes first.
Blue Columnar Cactus is generally easy to care for, though some plant parents report facing challenges with growing it. Check out the reviews down below to read more about their experiences!
Blue Columnar Cactus 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.
Blue Columnar Cactus 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 🏡.
Blue Columnar Cactus is not known to cause harm to humans or pets. Regardless, if you, a family member, a cat, or dog has ingested any plant material, please consult a doctor or a veterinarian.
Blue Columnar Cactus 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.
Blue Columnar Cactus 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!
Blue Columnar Cactus 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!
Blue Columnar Cactus is native to Central and South America.
Blue Columnar Cactus produces flowers in the wild, but does not flower when kept as houseplants.
Blue Columnar Cactus grows vertically and new growth will emerge from the top of the plant.
USDA Hardiness Zone
Blue Columnar Cactus can be grown outdoors in USDA Hardiness Zones 10-11b. Find your local hardiness zone here.
Blue Columnar Cactus can be propagated by the stem method. To propagate:
- Make a cut just above the node. The node is the break in the stem where the leaf emerges.
- To get the cutting to root, you can either:
- Place the cutting in water until roots emerge and are ~2” long and then transplant into well-draining soil, or
- Place the cutting directly into well-draining soil and water when dry.
Overwatering is a likely cause of issues with Blue Columnar Cactus. These plants are very sensitive to wet soil so if you notice your plant becoming squishy or translucent, overwatering is the likely culprit.
Cut your plant just past where the rot ends and allow it to callus over for a few days before replanting it in fresh, dry soil. Download Greg to make sure your plant never gets overwatered again!
Care Summary for Blue Columnar Cactus
Blue Columnar Cactus
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.