Haworthiopsis attenuata: expert tips and propagation guide

Few succulents are as instantly recognisable as Haworthiopsis attenuata, whose stiff, dark green rosettes are banded with raised pearly-white tubercles that give it the nickname zebra plant. Compact, slow and undemanding, it is the ideal windowsill succulent for bright rooms, shallow bowls and mixed cactus pans. Unlike many succulents, it positively dislikes scorching midday sun, which makes it one of the few that thrives in a light but shaded spot indoors.

Growing conditions

Bright, filtered light produces the best plants: compact rosettes with crisp white banding. An east- or north-facing windowsill suits it perfectly, as does a south-facing room a metre or so back from the glass. Direct summer sun through glass bleaches the leaves to a dull red-brown or burns white scars onto them.

Drainage matters more than fertility. Use a mix of roughly two parts loam-based compost (John Innes No. 2) to one part horticultural grit, perlite or pumice, aiming for a slightly acidic to neutral pH of around 6.0–7.0. Avoid peat-rich, water-retentive composts, which stay sodden around the thick roots.

In the open garden it is only reliable in frost-free Mediterranean, subtropical or coastal Californian climates. Elsewhere grow it in a pot, standing it outdoors in dappled shade from June to early September and bringing it in before nights drop below 10 °C.

How to plant Haworthiopsis

Plant or repot in spring, as light levels rise and the roots resume active growth. Repotting in the depths of winter risks rot, because damaged roots sit wet and cold.

• Allow 8–10 cm between rosettes in a shared bowl so each has room to produce offsets without crowding and shading its neighbours.
• Set the plant so the base of the lowest leaves sits just at compost level — burying the rosette neck invites crown rot.
• Add a generous third of grit or pumice to the compost, and top-dress with 1 cm of fine gravel to keep leaves off damp soil.
• Do not water in immediately. Wait five to seven days after planting so any torn roots can callus, then water thoroughly.
• Propagate by detaching rooted offsets in late spring; twist them away cleanly, dry for two days, then pot into barely moist gritty mix.

Care through the seasons

Spring: Growth restarts as days lengthen, so increase watering to roughly once every ten days, allowing the compost to dry completely in between. Feed once in April with a half-strength low-nitrogen cactus fertiliser. This is the moment to repot, divide crowded clumps and remove any shrivelled lower leaves.

Summer: Many plants pause in the hottest weeks, so water sparingly and never leave the pot standing in a saucer of water. Provide light shade under glass, as greenhouse temperatures above 30 °C combined with sun will scorch the leaves. Slender wiry flower spikes bearing small white, green-striped tubular flowers appear from late spring onwards; cut them off at the base once faded.

Autumn: A second flush of growth often follows the cooler, brighter days of September and October — resume regular but modest watering. Feed once more in early September if the plant is clearly growing. Move outdoor pots back under cover before the first chilly nights arrive.

Winter: Keep the plant cool, bright and almost dry, watering perhaps once a month, and never below 5 °C. Slight leaf shrinkage over winter is normal and plumps back up in spring.

Best varieties to grow

Several distinct forms and selections are widely available, differing mainly in the size and density of their white tubercles.

• Haworthiopsis attenuata var. radula — narrower, more tapered leaves peppered with many tiny white dots rather than bold bands.
• H. attenuata f. clariperla — tubercles merge into broad, chalky white stripes for maximum contrast.
• H. attenuata ‘Concolor’ — an understated plain green form with barely any tubercles, useful for contrast in a group planting.
• H. attenuata ‘Variegata’ — leaves striped lengthways in cream and pale yellow; slower growing and needs slightly brighter, softer light.

Pests, diseases and common problems

• Mealybug: White cottony clusters hide between the leaf bases and on roots, causing stunted, yellowing growth. Dab visible insects with a cotton bud soaked in surgical spirit, and drench the rootball with an organic fatty-acid soap solution; check roots at every repotting.
• Root and crown rot: Caused by overwatering or dense compost; leaves turn translucent, yellow and mushy at the base. Unpot at once, cut away all soft tissue, dry the plant for several days and replant in fresh gritty mix.
• Etiolation and sun scorch: Too little light stretches the rosette and pales the markings, whilst too much turns leaves red-brown with white scars. Move to bright indirect light and reintroduce stronger light gradually over two to three weeks.