How to grow blue chalk sticks
Overview
Blue chalk sticks (Curio repens) is a low-growing succulent with powdery blue-grey foliage, ideal as a groundcover or filler in hot, dry beds. It is grown for its attractive leaf colour and texture, and its ability to spread quickly in well-drained positions.
Soil Preparation
Blue chalk sticks thrives in slightly acidic to neutral pH (6.0–7.0) soil that is very well-drained. Amend heavy clay with coarse sand, pumice, or perlite. A gritty succulent mix is ideal for pots; in garden beds, raise the planting area to improve drainage.
Growing Guide
Plant blue chalk sticks in full sun in free-draining sandy or gravelly soil. Space cuttings or divisions 20–30 cm apart to allow for spreading. Water sparingly after planting, then only when the soil is dry to the touch; overwatering leads to rot. In cooler districts, wait until after the last frost to plant out, or grow in a pot that can be moved to shelter.
Care
Feed once in spring with a low-nitrogen succulent fertiliser at half strength. Prune back leggy stems in early summer to maintain a compact shape. Remove dead or rotting leaves promptly to prevent pest and disease buildup.
Companion Planting
Blue chalk sticks pairs well with other succulents like Echeveria, Sedum, and Aeonium, as well as with drought-tolerant perennials such as lavender, rosemary, and kangaroo paw. Avoid planting near moisture-loving plants that need frequent watering, as this can cause root rot.
Common Pests & Risks
Mealybugs are the most common pest, appearing as white cottony masses on stems and leaf axils; treat with neem oil or insecticidal soap. Root rot from overwatering is the main disease; ensure excellent drainage and allow soil to dry between waterings. Fungus gnats may appear in overly wet potting mix.
Troubleshooting
Yellow leaves: overwatering or poor drainage—reduce watering and check soil. Brown leaf edges: too much direct sun or heat stress—provide light afternoon shade in extreme heat. Leggy growth: insufficient light—move to a sunnier spot. Soft mushy stems: rot from excess moisture—remove affected parts and dry out soil. White cottony spots: mealybug infestation—treat with neem oil.