Caring for Indoor Barrel Cactus

If you are looking for an interior addition that is a bit outside of the norm, look no further than the Barrel Cactus. This plant can make an incredibly interesting addition to the interiorscape, it is often added to southwestern designs, and contemporary layouts.

As stated it is an unusual addition indoors, and there are a few reasons for that. One of the reasons is obviously the fact that a cactus presents a real element of danger and may not be a great option in areas where it may be brushed up against or accidentally touched. Another reason is that the environmental conditions needed for these intriguing spheres to thrive is not prevalent in interior spaces, and many people have little understanding of how a cactus needs to be cared for indoors, they have very different requirements from the typical foliar houseplant.

Of the many indoor cactus, Barrel cactus have some of the most extreme differences, and particular tolerances. Understanding what this plant needs will make a decision in selection, placement, and care a snap.

Native Habitat Southwestern US & Mexico

Is Barrel Cactus a good indoor choice for your space?

If you have considered bringing a Barrel cactus into your home or workspace there are some environmental issues to look at before making a decision.

Barrel cactus in their natural outdoor habitat live in the most extreme heat, and direct sun. Due to this, indoors they require a significant amount of natural light, anything less will cause them to die ultimately. An available space windows that receive excellent, even harsh direct sunlight from outdoors is an ideal space for a Barrel Cactus.


In order to properly water a cactus you must have a good understanding of a Cactus and its natural environment.

Barrel cactus grow naturally in some of the most foreboding landscapes on the planet. These desert landscapes produce extreme scorching, relentless blazing sun, and little to no precipitation for much of the year, and then monsoonal rain.

Cactus have evolved into a sort of a water storing stem, that collects light through this compact stem instead of leaves. This compact design helps cacti to minimize transpiration (plant equivalent of perspiration), and maximize water storage. Barrel cactus is one of the most compact cacti, it could be considered the water conservation tank of the desert, everything about it is designed for water storage and protection.

Keeping this in mind, and remembering that even the most harsh interior situations are most likely no match for the Sonoran Desert it becomes obvious that an indoor Barrel cactus will not need much water very often. As a matter of fact you can probably get away with watering this type of cactus a couple times a year with good results, believe it or not.

How often & How Much?

Since most Barrel cactus are very tight in their grow pots, often forming a muffin like shape as the pop out over the edges of their pot, it is nearly impossible to check soil moisture, also the dense intertwined spines on this Cacti prevent feeling it's turgidness or how firm it is, so how do you know when to water? Easy answer with this plant is to put it on a very lean watering schedule, watering thoroughly maybe every two months and then leaving it alone.

The best advice is that if there is any question on whether to water or not, DO NOT WATER. It is highly unlikely that a Barrel cactus will die from under watering.

The most common health issue for interior cactus is over watering. It is difficult for us humans to just leave things alone, this constant need to do something can be compounded if one has become accustomed to caring for interior foliar plants that need more consistent care. It is a whole new approach to plant care.

How to get the water get in the soil?

With Barrel cactus basically overflowing their pots leaving no room for exposed soil surface, one may wonder; How can I get the water to the soil? Looking at this cacti we see that it has a center at it's top and a series of peak and valley ridges that run all around the cactus body. The valleys of these ridges will act as little irrigation troughs if you water onto the center of the top of the cactus. The water will run down the ridges and into the soil under the plant.

Tips for Handling

Other Things to know

There are some other interesting things to know about this mysterious spherical plant.

  • They are slow growing, very, very, very slow growing. There will often be no change in there shape or size in an interior environment.
  • They die from the inside out. When there is a problem you may not know until months later since these plants start to disintegrate from the center out. It is not uncommon to hear reports of these cactus, that describe them being found in at some point as a gelatinous ball that breaks open and oozes all over the floor. This is commonly attributed over watering.
  • Cactus can be infested with mealy bug, and or scale. It is not incredibly common, but it does happen, especially since the plant has been removed from the environment in which it thrives, therefore weakening it's natural defenses. A spray down to remove the pests, and coating with insecticidal soap is the best treatment and defense for such an infestation.
  • Handle with Care. The spines will hurt you if touched, it is wise to place this plant out of high traffic areas, and out of the reach of children.

At this point if you have considered all the factors to keeping a Barrel cactus as a houseplant, and have decided that you have the right environment, and a great degree of self control, I wish you well on your new adventure with this magnificent creature.

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