Trichocereus Grandiflorus “Torch Cactus” Care & Buying Guide

Trichocereus Grandiflorus


Light requirements High
Water requirements Low
Ease of care Easy
Size Large
Toxicity Non-toxic
Zone 8b
Temperature resistance Frost-hardy
Growth speed Medium
Indoor growing Suitable


Taking Care Of Trichocereus Grandiflorus “Torch Cactus”

Ideal conditions

Trichocereus Grandiflorus “Torch Cactus” is similar to many other cacti – it requires little water and likes partial to full sun. The latter means that it’s best to be kept outdoors.

Besides, with some newer hybrids growing up to 1-2 feet tall and 12 inches wide, the Torch Cactus may be a too bulky cactus for indoor keeping.

The Torch Cactus is more cold-resistant than the typical cactus – it can survive in temperatures as low as 15 degrees Fahrenheit (-9.4 degrees Celsius). While it still won’t survive harsh winters, it can do pretty well in mildly cold areas if kept dry.


Just like many other succulents, Trichocereus Grandiflorus “Torch Cactus” should be thoroughly watered only when its soil is dry to the touch. Overwatering can cause waterlogging and root rot in this cactus, so be careful with how much you water it.

Root rot is even more likely in winter when the Torch Cactus is dormant and requires little water. To protect your Trichocereus Grandiflorus “Torch Cactus” from cold and root damage, you shouldn’t water it at all in winter, or you should at most mist it perhaps two times a month.

Where to plant

Plant your Trichocereus Grandiflorus “Torch Cactus” in porous, fast-draining cactus soil. Such soil will decrease the risk of water damage. To further enhance drainage, you may add perlite or pumice to the mix in a 1:1 ratio or more.

Given that the Torch Cactus likes partial to full sun, it should be kept outdoors where natural light is plentiful. Though the Torch Cactus benefits from bright sun, on very hot days, it should be temporarily moved to a shaded location.

You may also keep this cactus indoors, but only if you have a window sill that receives direct sunlight all day. If the spot of the cactus lacks natural light, you may compensate for it with grow lights, but do keep in mind that natural sunlight is preferable.

If your cactus is kept outdoors, then keep an eye on fall and winter temperatures and move the pot inside if the temperatures get too low.

General care information

Once every 4-8 weeks throughout the growing season (spring & summer), fertilize the cactus with a cactus fertilizer mix diluted to half strength. If you’ve just repotted your Torch Cactus, then you may not need to fertilize it since the fresh soil will still have plenty of nutrients in it.

Quite a quick grower, Trichocereus Grandiflorus “Torch Cactus” will need to be repotted a few times throughout its lifetime. You may repot your Torch Cactus only when it outgrows its pot, but preferably, repot the cactus every spring or summer. More frequent repotting will allow you to inspect the roots of the cactus and remove damaged parts if any.


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