Great Design Plant: Milk Bush (Euphorbia tirucalli) — Architectural Succulent with Toxic Sap

Succulents add architectural, clean-textured accents. Milk bush (Euphorbia tirucalli), aka pencil tree, takes this to the extreme: open structure, rubbery cartoon-like branches — eye-catching and exotic even among succulents.

Caution: Avoid direct skin contact — milky sap is toxic.

Botanical name: Euphorbia tirucalli
Common names: Milk bush, pencilbush, pencil tree, Indian tree spurge
USDA zones: 10–11
Water: Minimal; drought-tolerant
Sun: Full sun
Mature size: Up to 30 ft (usually kept smaller)
Benefits: Drought/coastal tolerant; flowers attract bees/birds; birds nest in it
Seasonal interest: Evergreen; insignificant flowers
When to plant: Propagate by cuttings. Safety: Wear gloves, long sleeves, goggles when pruning/planting/transporting. Allow cut stems to dry/seal to contain sap.

Distinguishing Traits

Habit and color are most apparent. Unlike tight rosettes of other succulents, milk bush branches and spreads freely — imagine the shadow it casts. Upright tree/shrub; native African sizes to 30 ft, smaller in cultivation.

‘Sticks on Fire’ (shown): popular cultivar. Foliage turns bright yellow in summer, vibrant red in winter. Less chlorophyll = slower growth.

Landscape Uses

• Architectural accent — form contrasts rosette succulents; rubbery texture adds structure.
• Visual diversity in all-succulent gardens; textural/shape contrast in mixed foliage beds.

Planting Notes

• Plant in ground, containers, or indoors (if warm/dry).
• Well-drained soil, mostly dry. Tolerates salt/wind — grows right on coast.
• Not hardy below ~30°F — bring indoors if winters are cold.