Echinocereus Subinermis Care & Buying Guide

Echinocereus Subinermis


Light requirements Medium
Water requirements Low
Ease of care Easy
Size Medium
Toxicity Non-toxic
Zone 9b to 11b
Temperature resistance A little frost-hardy
Growth speed Slow
Indoor growing Suitable


Taking Care Of Echinocereus Subinermis

Ideal conditions

Echinocereus Subinermis prefers bright light, but it doesn’t tolerate full sun very well, especially on hot days. With this in mind, the Echinocereus Subinermis cactus can be easily grown both indoors and outdoors.

Temperature-wise, Echinocereus Subinermis is similar to many other succulents – it’s a little frost-hardy (survives temperatures down to 25 degrees F/-3.9 degrees C), but it shouldn’t be left out in winter for too long.


Echinocereus Subinermis is drought-resistant and doesn’t need much water to thrive. Water this cactus only when its soil is dry to the touch and do not overwater it since its weak root system is prone to root rot.

Root rot is especially likely in winter when the cactus is dormant and requires little to no water. During the cold months, either lightly mist the soil once or twice a month, or suspend watering until spring.

Where to plant

To ensure good drainage, plant your Echinocereus Subinermis cactus in porous, fast-draining soil. Considering the weak root system of this cactus, it’s also worth adding some perlite or coarse sand to the soil to enhance drainage. Add these in a 1:1 ratio to the potting mix or more.

Even if intending to keep this cactus outdoors, plant it in a pot – this will allow you to easily move the cactus around to protect it from heat or frost. The pot should have large drainage holes at the bottom.

As mentioned above, Echinocereus Subinermis can thrive both indoors and outdoors due to its not so high light demands. It benefits from bright light but doesn’t tolerate full sun too well. Filtered light should be good enough for this cactus. On very hot days, move it to a shaded location to prevent sunburn.

Echinocereus Subinermis doesn’t tolerate cold well either – in winter, be sure to move it inside to prevent freezing.

General care information

A slow-growing cactus, Echinocereus Subinermis should be fertilized throughout its growing season (spring and summer). You should fertilize it once or twice per month with a cactus fertilizer diluted to 1/4-1/2 strength.

Take care not to fertilize this cactus too much – if the plant grows excessively, the weak roots will not be able to supply it with nutrients. 

Aside from fertilization, you will also need to occasionally repot Echinocereus Subinermis. Given the slow growth rate, you may do so every other year or two. However, considering the weak root structure of this cactus, you may want to repot the cactus every spring or summer to be able to assess its root health.

Besides, introduction to fresh soil may boost the growth of this slow-growing cactus.

When repotting, be very careful with this plant since its roots are delicate. Allow the soil to dry before repotting for easy removal, and don’t water the cactus for about a week after moving it to a new pot.


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