Crassula rupestris, known as “Buttons on a String,” “Pagoda Plant,” or “stacked crassula,” is a distinctive succulent valued for its unique appearance. Its thick, fleshy leaves grow in a stacked, opposite arrangement along its stems. Leaves often display reddish tips in ample sunlight. Native to South Africa’s arid regions, it thrives with limited water and abundant light.
Crassula Rupestris Care
Light
Crassula rupestris thrives in bright, direct sunlight, which is crucial for maintaining its compact growth and vibrant leaf tips. Insufficient light causes etiolation, leading to leggy, stretched stems and loss of its stacked appearance. Outdoors, provide at least six hours of full sun daily; afternoon shade can prevent scorch in intense summer heat.
Watering
Water Crassula rupestris using the “soak and dry” method: thoroughly saturate the soil, then allow it to dry completely before rewatering. During its spring and summer growing season, water every 2-4 weeks, depending on conditions. In dormant autumn and winter months, reduce watering significantly (monthly or less) to prevent root rot from overwatering. Ensure that excess water can freely drain from the pot.
Soil
Well-draining soil is paramount for Crassula rupestris to prevent waterlogged conditions and root decay. A commercial succulent or cactus potting mix is suitable, providing aeration and drainage. Enhance drainage by amending standard potting soil with perlite, pumice, or coarse sand for quick water passage.
Temperature
It tolerates warm conditions, 65-80°F (18-27°C), during its growth period. While it can endure higher temperatures with good air circulation, it is sensitive to frost. Bring plants indoors if temperatures drop below 30°F (-1°C) to prevent cold damage. Indoors, average room temperatures are suitable.
Fertilizing
It is not a heavy feeder and requires minimal fertilization. If fertilizing, do so sparingly during its spring and summer growing season. Use a balanced, water-soluble fertilizer diluted to half or quarter strength, applying no more than once every two to three months. Over-fertilization can cause leggy growth or root burn; it’s often better to omit fertilization if the plant appears healthy.
Propagating Crassula Rupestris
Propagating Crassula rupestris is straightforward. The most reliable method is taking stem cuttings from a healthy plant during its spring or summer growing season. Cut a 2-4 inch stem section with several leaf sets. Allow the cut end to dry and callus for several days to a week to prevent rot.
Once callused, plant the cutting upright in a well-draining succulent or cactus potting mix. Lightly mist the soil every few days, but avoid heavy watering until roots form (typically within weeks). Place the pot in bright, indirect sunlight to encourage root development. New growth signals successful rooting.
Common Problems and Solutions
Etiolation, characterized by stretched stems and widely spaced leaves, results from insufficient light. Move the plant to more direct sunlight; prune leggy growth for a compact form. Root rot, indicated by mushy stems or yellowing leaves, is caused by overwatering and poor drainage. Address root rot by repotting into fresh, well-draining soil, removing affected roots, and adjusting watering.
Pests like mealybugs or spider mites can infest Crassula rupestris, appearing as cottony masses or fine webbing. Control them by wiping with rubbing alcohol or applying insecticidal soap. Leaf drop can occur from overwatering, underwatering, or sudden environmental changes. Assessing watering and ensuring stable conditions usually resolves this.
Is Crassula Rupestris Toxic?
Crassula rupestris is considered mildly toxic if ingested by humans or pets. While some sources indicate it is non-toxic, others state it can be toxic, causing symptoms like vomiting, abdominal pain, diarrhea, and dizziness. Keep this plant, like many houseplants, out of reach of children and pets to prevent accidental ingestion.