Echinocereus Rigidissimus Rubrispinus “Rainbow Hedgehog Cactus” Care & Buying Guide


Light requirementsHigh
Water requirementsLow
Ease of careEasy
Zone9a to 11b
Temperature resistanceMildly frost-hardy
Growth speedSlow
Indoor growingSuitable


Taking Care Of Echinocereus Rigidissimus Rubrispinus “Rainbow Hedgehog Cactus”

Ideal conditions

Echinocereus Rigidissimus Rubrispinus “Rainbow Hedgehog Cactus” grows the best outdoors since it requires plenty of light. In fact, surviving in temperatures down to 20 degrees F (-6.7 degrees C), the Rainbow Hedgehog Cactus is also quite frost-hardy, so it should do good outdoors in winter as well.

Indoor growing is also possible with this cactus, but it will be a little more challenging due to the cactus’ light needs.


The Rainbow Hedgehog Cactus should be watered only once its soil is dry to the touch. Like many other succulents, this cactus is drought-tolerant and requires little water.

One thing to keep in mind with Rainbow Hedgehog Cacti is that they tend to have weak root systems that are very prone to root rot if overwatered. So be careful with how much water you supply to your cactus.

In winter, water the Rainbow Hedgehog Cactus only once or twice per month, or don’t water it at all. Dormant in winter, this cactus requires little to no water to survive.

Where to plant

Plant your Echinocereus Rigidissimus Rubrispinus “Rainbow Hedgehog Cactus” in porous, fast-draining soil. Such soil will reduce the risk of waterlogging and root rot.

Consider adding mineral grit like coarse sand or perlite in the mix as well. Given how sensitive the roots of this cactus are to water, add mineral grit in at least a 1:1 ratio, though you may try to go as high as 60% or 70%.

Since the Rainbow Hedgehog Cactus requires partial to full sunlight, you should keep it outdoors. Indoor growing is also possible, but only if you have a spot that receives direct sunlight all day long. You may also use grow lights for inside growth, but keep in mind that natural light is preferable.

Whether indoors or outdoors, be sure to place a sunshade over the cactus or move it to a shaded location during extreme heat.

In winter, you might also want to move your Rainbow Hedgehog Cactus inside to protect it from low temperatures.

General care information

Echinocereus Rigidissimus Rubrispinus “Rainbow Hedgehog Cactus” is a slow-growing cactus, and a steady diet of a fertilizer diluted to 1/4-1/2 strength should allow you to ensure successful growth. Fertilize the plant with a cactus fertilizer in spring and summer once or twice a month, depending on the strength of your fertilizer.

You probably won’t have to repot the Rainbow Hedgehog Cactus often since it’s a slow grower. Repotting every other spring or summer should do fine. However, given how sensitive the roots of this cactus are, you may want to repot it every year – this will allow you to check on the health of the roots.

But when repotting this cactus, be very gentle to avoid damage to the roots.