The Variegated Joseph’s Coat Cactus (Euphorbia tirucalli ‘Sticks on Fire’ variegata), also known as ‘Sticks on Fire’ or ‘Pencil Cactus’, is a striking succulent. Its vibrant red, orange, and yellow hues make it a popular choice for gardens and indoor spaces.
Understanding its Unique Features
Its distinctive variegation causes its pencil-like stems to display an array of colors. Stems transition from green and yellow to brilliant orange, pink, and fiery red, with intensified colors appearing under ample sun or cooler temperatures. Over time, the plant develops a dense, shrub-like or tree-like form. Its cylindrical, profusely branching succulent stems create a unique architectural quality.
Essential Care Requirements
Light
The ‘Sticks on Fire’ succulent thrives in bright, direct sunlight, which intensifies its vibrant coloration. At least six hours of direct sun daily encourages its striking reds and oranges. Insufficient light results in duller colors and leggy growth. When transitioning a plant to full sun, do so gradually to prevent sunburn.
Watering
This succulent prefers a “soak and dry” watering method. Water thoroughly until drainage, then allow the soil to dry completely before rewatering. Overwatering causes root rot; underwatering leads to shriveled stems. During spring and summer, water every two to three weeks. Reduce frequency significantly in fall and winter dormancy.
Soil and Potting
Well-draining soil is important for the Variegated Joseph’s Coat Cactus to prevent root rot. A specialized cactus or succulent potting mix is ideal, providing aeration and drainage. For a custom mix, combine regular potting soil with coarse sand, perlite, or pumice. Always use pots with drainage holes. Repot every two to three years or when root-bound, ideally in spring or early summer.
Temperature and Humidity
This plant prefers warm temperatures (60-85°F / 15-29°C) and tolerates significant heat. It is frost-sensitive and will not survive below 32°F (0°C). In colder climates, bring it indoors before the first frost. As an arid succulent, it has low humidity requirements.
Fertilizing
Light fertilization supports healthy growth during the active spring and summer growing season. Use a balanced, diluted liquid succulent or cactus fertilizer every four to six weeks. Fertilizing is unnecessary in fall or winter dormancy. Over-fertilization can harm the plant and diminish its variegation.
Propagation
Propagate ‘Sticks on Fire’ using stem cuttings. Carefully take cuttings from healthy, mature stems, wearing gloves to protect against the milky, irritating sap. Allow cuttings to air dry for several days until the cut end forms a callus, preventing rot. Insert callused cuttings into a well-draining succulent or cactus soil mix. Water sparingly until roots establish, which can take several weeks.
Common Issues and Troubleshooting
Loss of vibrant coloration (duller green stems) indicates insufficient light; move the plant to a brighter location. Stem rot or mushy stems signal overwatering; reduce watering frequency and ensure well-draining soil with drainage holes. Shriveled or wrinkled stems usually point to underwatering or severe root rot; adjust watering for consistent moisture, allowing soil to dry between waterings. ‘Sticks on Fire’ can be affected by pests like mealybugs or spider mites. Regularly inspect and treat infestations with non-toxic solutions like rubbing alcohol or insecticidal soap.