How to care for and propagate Spiral Cactus | Cereus Forbesii Spiralis

If you’ve ever seen a cactus that looks like it’s been caught in a whirlwind, you’ve met the Spiral Cactus | Cereus forbesii ‘Spiralis’. This jaw-dropping plant twists its way up like a botanical tornado, making it one of the most visually captivating cacti out there. Whether you call it the Tornado Cactus, Wonderful Wacky Cactus(™), or simply the Spiral Cactus, one thing is for sure—this is a true collector’s gem that adds a sculptural, almost surreal touch to any space.

But what makes this cactus spiral? And how do you care for it? Let’s dive into everything you need to know to grow and enjoy this unique plant.

Background: What is the Spiral Cactus?

The Spiral Cactus is a special mutation of Cereus forbesii, a species native to South America. While the standard Cereus grows in tall, straight columns, this one takes on a mesmerizing twist.

• Scientific Name: Cereus forbesii ‘Spiralis’

• Common Names: Spiral Cactus, Tornado Cactus, Wonderful Wacky Cactus(™)

• Growth Habit: Fast-growing, columnar, branching, reaching up to 6-13 feet tall when mature

• Flowers: Large, fragrant, white night-blooming flowers

• Fruit: Produces red, seed-filled fruit similar to dragon fruit

Unlike some decorative crested or monstrose cacti, which only occur as one-off mutations, the Spiral Cactus can pass down its signature swirl to offspring, though not every seedling will retain the spiral form.

Why Does the Spiral Occur?

The twisting shape of the Spiral Cactus is caused by a natural mutation. This isn’t unique to Cereus forbesii—spiral growth can occur in other cacti and succulents, just like cresting and monstrose mutations.

• Spiralis Mutation: Causes the plant to twist as it grows, creating a consistent corkscrew pattern.

• Other Twisted Forms: Some plants develop variations like the “Fat Whorl” or looser Cereus Peruvianus “Twist” formations.

• Similar Plants: The Unicorn Cactus (Eulychnia castanea ‘Spiralis’) is another example of a naturally occurring spiral mutation in a different genus.

While the spiral trait can be passed down through seeds, not all seedlings will inherit the perfect twist. Because of this, many Spiral Cacti are propagated from cuttings to ensure their signature shape.

Changing Directions

Some Spiral Cacti exhibit 'Turbulence', a phenomenon where the spiral fluctuates between tight and loose twists, or even changes direction partway up the column. This is still being studied, but it is likely a combination of genetics and environmental stress.

Spiral Cactus Care Guide

Lighting & Placement for a Spiral Cactus

1. To keep your Spiral Cactus growing strong and healthy, it needs plenty of bright light:
   1. Ideal Locations: A south- or west-facing window or a bright patio/balcony.
   2. Full Sun: Thrives in full sun but can also do well in bright indirect light.
   3. Avoid Etiolation: If your cactus starts growing thin and stretched, it needs more light—move it to a brighter spot.

Soil for a Spiral Cactus

1. A well-draining soil mix is crucial to prevent root rot.

   1. Best Mix: Use a cactus/succulent soil mix with at least 30% perlite or pumice.

   2. Why It Matters: This ensures excess water drains quickly.

Repotting a Spiral Cactus

1. Your Spiral Cactus will need a new home every 1-2 years to accommodate its growth.

   1. Pot Size: Choose a pot 2-3 inches larger than its current one.

   2. Drainage is Key: Ensure the pot has ample drainage holes.

   3. Stability: Since this cactus grows tall, use a deep, heavy pot to prevent tipping.

How to water a Spiral Cactus

1. The Spiral Cactus follows a soak-and-dry watering method, but its needs change with the seasons:

   1. Growing Season (Spring-Summer): Water deeply when the soil is completely dry or the cactus looks wrinkled and starts leaning.

   2. Dormant Season (Winter): Reduce watering drastically—only water if the plant starts wrinkling. Completely stop watering if going into full dormancy.

2. Signs of Thirst: If the plant becomes limp or wrinkled and leans to the side, it’s time to water.

3. This species is thirstier than most cacti, so keep an eye on its ribs for signs that it needs a drink.

Common Problems with Spiral Cactus

1. Like all cacti, the Spiral Cactus has a few common problems:

   1. Etiolation: If it stretches out and loses its tight spiral, it’s not getting enough light.

   2. Overwatering: Can lead to root rot and fungal spots—when in doubt, wait before watering.

   3. Underwatering: Can lead to stress and the cactus will not grow healthy. It will start to shrivel and lean over.

   4. Sunburn: Will burn if you don’t acclimate them to full sun. Will turn more green in brighter light (instead of the more blue hue you’ll see with filtered light)

Common Pests for Spiral Cactus and Treatment

1. This cactus is relatively hardy but can occasionally attract pests:

   1. Scale & Mealybugs: Treat with a cotton swab dipped in rubbing alcohol or neem oil.

   2. Spider Mites: Rinse the plant with water and use insecticidal soap if needed.

   3. Fungus Gnats: Let the soil dry completely between waterings and use sticky traps if necessary.

Ideal Temperature and Humidity for Spiral Cactus

1. Cold Tolerance: Can survive down to 27-28°F, but frost can cause damage.

2. Ideal Temps: Grows best between 60-90°F.

3. USDA zones: 10, 11

When is the Spiral Cactus Dormant?

1. Winter Dormancy: Stops growing in winter—reduce watering and avoid exposing it to freezing temps.

How to Propagate a Spiral Cactus

1. You can propagate the Spiral Cactus by:

   1. Cuttings: The easiest method—let the cut ends callous for a few days before planting in well-draining soil.

   2. Seeds: Can be grown from seed, but not all offspring will have a spiral form.

Is a Spiral Cactus Toxic to Pets?

1. Non-Toxic: Safe for pets and humans—though the spines can be sharp!

Does a Spiral Cactus Flower?

1. Yes! Mature plants will produce:

   1. Large, fragrant, night-blooming white flowers.

   2. Red fruit that contains seeds, similar to dragon fruit.

Why We Love the Spiral Cactus

The Spiral Cactus isn’t just a plant—it’s a sculptural statement piece. Whether placed in a modern home, outdoor garden, or cactus collection, its wild twisting form always draws attention. Plus, it’s fast-growing and relatively easy to care for!

• Available Sizes: Currently sold in 4” (approx 8” plant”) and 6” pots (approx 15” plant), with more sizes and varieties coming soon.

Other Cultivars & New Forms

While the classic Spiral Form is the most well-known, exciting new variations are emerging:

• ‘Turbulence’ Form: A mix of spiral and monstrose growth.

• Lime Green Spiral: A brighter green version compared to the blue spiral.

• Variegated Spiral: A rare, high-contrast form with striking yellow variegation.

Conclusion

The Spiral Cactus is one of nature’s most stunning mutations, combining fast growth with a mesmerizing shape. We love it for its fun, unique shape as well as its surprising ease of care. Just put it in a place that has bright light and is in sight, water when the soil is dry and the plant starts to wrinkle, and anchor it in well-draining soil, and your plant should thrive. Want to add one to your collection? Check out our latest stock of Spiral Cacti—available now in multiple sizes!