Euphorbia ‘Cocklebur’
Euphorbia ‘Cocklebur’ produces short, pine-cone-shaped stems covered in corky tubercles with tufts of green leaves at the apex, resembling a miniature pineapple. This hybrid plant forms a compact underground caudex and clusters into tight colonies over time. It creates an unusual focal point for specialized collections due to its distinct geometric shape. It is also known as Euphorbia xjaponica.
Origin and Natural Habitat
This plant exists entirely as a horticultural hybrid created by crossing Euphorbia bupleurifolia and Euphorbia susannae. It inherits traits from both parent species native to South Africa. Cultivated specimens adapt well to container growing under controlled conditions that mimic dry, rocky habitats.
Plant Characteristics
The stem reaches up to 5 cm long and 4 cm in diameter, featuring prominent spiral tubercles left by fallen leaves. Lance-shaped, deciduous leaves emerge in dense tufts at the tip during active growth periods. The plant sheds these leaves during dormancy. A thick, turnip-like taproot anchors the base below the soil surface.
Care Guide
Light
Provide bright light with partial sun exposure. Direct, harsh afternoon rays scorch the stem surface. Morning sun promotes healthy growth and keeps the stems compact.
Soil
The fleshy root system demands rapid drainage to prevent fungal rot. Plant the specimen in LDP Super Drainage Mix to ensure quick water runoff and proper oxygenation.
Water
Water thoroughly during active spring and summer growth phases. Let the soil dry out completely between watering sessions. Withhold water entirely during the cold winter dormancy to protect the roots.
Pot Size
Select a deep container to accommodate the heavy taproot. Avoid wide pots that hold excess moisture away from the root zone.
Temperature
Keep ambient temperatures between 15°C and 30°C. Protect the plant from frost and freezing conditions.
Humidity
Maintain high airflow and low humidity around the plant. Stagnant air invites fungal decay within the dense leaf tufts.
Fertilizing
Apply a balanced, water-soluble fertilizer diluted to quarter strength once during the middle of spring. Avoid feeding during the winter dormant phase.
Growing Season
Euphorbia ‘Cocklebur’ grows actively during the warm spring and summer months. It drops its leaves and enters a dormant phase as temperatures drop in winter.
Propagation
You can propagate this plant through stem cuttings or seed.
Stem Cuttings: Cut a healthy side branch using a clean, sharp blade during late spring. Allow the cut surface to dry in a shaded area for five days until a solid callus forms. Press the callused base into dry LDP Super Drainage Mix. Keep the container in bright, indirect light and wait one week before applying a light mist of water to stimulate root development.
