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4.6 out of 5 (65 experiences)


Also known as
San Diego Cactus and Pilosocereus azureus
Taxonomy
Pilosocereus pachycladus
Pilosocereus
Cactaceae
Caryophyllales

How to care for Blue Columnar Cactus
How often to water your Blue Columnar Cactus

every 12
Blue Columnar Cactus needs 0.5 cups of water every 12 when it doesnāt 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 Blue Columnar Cactus in your home

a window
Blue Columnar Cactus love being close to bright, sunny windows š.
Place it less than 1ft from a south-facing window to maximize the potential for growth.
Blue Columnar Cactus does not tolerate low-light š«.
Select your region to see how the current weather in your area affects the placement of Blue Columnar Cactus in your home š”.
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 itās 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 yearāwhichever comes first.
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Damage in a cactus column #BlueColumnarCactus there seems to be some damage in my cactus. Any idea what this is? Should I be worried?
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Can someone tell me what this spot is on my cactus? I did repot last week and hope I didn't cause damage. It was perfectly fine before š¢ #GregFeedback #BlueColumnarCactus #GreggersSupportingGreggers #help
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When is it time to repot a cactus? Is it time to repot?
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Meet my new plant baby bluey š #CactusClique #HappyPlants
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New to the family. Love the shape and blue color
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My cactus is sick My cactus started having this color that started spreading gradually since a couple of moths and it looks like this now: If itās sick how can I stop it from getting worse? Also is this damage irreversible? #Cactus
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@SirLiquorice look at this beauty I got from the Loweās clearance section for 14$ #HappyPlants #SucculentLove #
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I got this cactus from my grandmother but Iām not sure how to care for it. Any tips??
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Should I be worried? Iāve recently noticed this weird texture in my cactus. Should I be worried?
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#help I propagated my cactus recently but the stems? Have gotten moldy, does anyone have any advice.
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!
š¦ Water Needs
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.
āļø Sunlight Needs
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 šŖ. Select your region to see how the current weather in your area affects the placement in your home š”.
š¶ š š¶ Toxicity
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.
šØ Humidity
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.
šŖ“ Soil
Blue Columnar Cactus is very sensitive to wet soil, so choose a potting soil that drains very well and doesnāt 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!
š© Fertilizer
Blue Columnar Cactus grows very slowly and doesnāt require added fertilizer. Replacing your plantās potting soil once a year should provide them with more than enough nutrition. Remember, plants get their energy from sunlight, not fertilizer!
š Native Region
Blue Columnar Cactus is native to Central and South America.
šø Flowers
Blue Columnar Cactus produces flowers in the wild, but does not flower when kept as houseplants.
ā¬ļø ā¬ļø Growth Pattern
Blue Columnar Cactus grows vertically and new growth will emerge from the top of the plant.
š¦ļø Growing Outdoors
USDA Hardiness Zone
Blue Columnar Cactus can be grown outdoors in USDA Hardiness Zones 10-11b. Find your local hardiness zone here.
š± Propagation
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 ~2ā long and then transplant into well-draining soil, or
- Place the cutting directly into well-draining soil and water when dry.
š§ 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.
š Common Issues
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
Greg recommends:

0.5 cups every 12 days

< 1ft from a window

Repot after 2x growth
Based on the 4ā pot your plant is in, and that it doesnāt get direct sunlight.

What other plant parents say





