In the wild A. flagelliformis is either lithophytic or epiphytic, meaning it grows on the ground or on larger structures such as trees. In cultivation, it is usually grown in hanging pots or baskets because of its trailing stems, which can grow up to 1 foot in length per year. This plant is fairly drought-tolerant and can survive long periods with little care.
Light
This is a cactus that thrives in desert conditions: bright, direct sunlight year-round. Place it in a south- or west-facing window to receive direct sun.
Soil
Excellent drainage is key so choose a lightweight potting mixture. Like all cacti, rat tail cactus does best in a slightly acidic pH between 5.0 and 6.0 which most cactus potting mixes offer.
Water
Water regularly during the growing season to keep the soil slightly moist. Reduce watering in the fall, tapering it off as you move toward winter. During its winter dormancy period, it generally does not need water, but you can water it lightly if the soil is completely dry.
Temperature and Humidity
Overall, this is a fairly hardy cactus that can tolerate temperatures as low as 45 degrees and as high as 90 degrees. Regular room temperatures are just fine, and ideally the nighttime temperatures are between 60 to 70 degrees Fahrenheit. The cactus is not frost-hardy, so make sure it does not ever get exposed to freezing temperatures.Comfortable humidity levels in most homes are just right for rat tail cactus. High humidity can cause the plant’s stems to rot, while extreme dryness can lead to problems with spider mites.
Fertilizer
Feed your rat tail cactus liquid fertilizer diluted to about half strength about once every two weeks during the growing season in spring and summer.
Cactus Types
The rat tail cactus, one of the most popularly cultivated cacti, is similar to these other species of ornamental cactus:
Golden rat tail cactus (Cleistocactus winteri), a branching cactus whose stems are covered with short golden spines German empress (Disocactus phyllantioides) with long, green or reddish stems Dog tail cactus (Strophocactus testudo) with long, skinny, tail-like, trailing stems
Pruning
Other than removing dead or diseased plant parts, the only pruning of this cactus consists of gently pulling dead flowers off the plant. However, be very careful when handling the plant and make sure to wear protective cloves with long cuffs.
Propagating
With its large number of stems and vigorous growth, the cactus is very easy to propagate from cuttings and new specimens can be propagated every season. Just like with pruning, protect your hands and forearms when propagating it.
How to Grow Rat Tail Cactus from Seed
Seeds are not widely available for rat tail cactus and propagation from a cutting is so easy that growing it from seed is not recommended.
Potting and Repotting
Rat tail cactus displays best when grown in a hanging basket. Line the container with sphagnum moss or other organic material before filling it with cactus potting mix. Rat tail cactus grows fairly quickly and should be repotted every year once the growing season is over and the plant has finished flowering. It may need a larger pot or basket, depending on whether the plant has fully matured, but it definitely needs new potting soil. This cactus quickly uses nutrients, and repotting it will help it replenish.
Overwintering
Regardless of whether you grow rat tail cactus outdoors year-round or bring it inside for the winter, the cactus needs a rest period during which it should be kept between 55 and 65 degrees Fahrenheit. However. the light requirements are the same during dormancy; the cactus needs bright light year-round. Find a cool location in your home, away from busy areas so that the humans and pets won’t accidentally brush against its spines.
Common Pests
The most commonly observed pests of rat tail cactus are spider mites and scale insects which suck the plant juices. As a result the cactus might look dull and/or have little white dots from the punctures. These pests can be controlled with insecticidal soap or neem oil.
How to Get Rat Tail Cactus to Bloom
Provided that you are repotting your cactus with fresh potting mix (cactus potting mix) as needed and fertilize it regularly, not enough sunlight is the most common reason why rat tail cactus is not blooming. Full, bright direct sunlight is essential for the cactus to produce flowers.
