Snowflake Cactus
Commonly called the ‘Snowflake Cactus’, Euphorbia Polygona is not actually a cactus at all, however it is a succulent.
It is heavily ribbed species with spines on the ridges and over time it will form a cylindrical body.
Over time it will form offsets and therefore create a small colony of plants.
It is almost disease and pest free and with its interesting growth habit makes a good specimen plant for growing in containers.
How To Grow Euphorbia Polygona – Basic Care
This is a succulent from the Eastern Cape area of South Africa. Very similar in appearance to E. horrida and often confused, it is distinguished by having a narrower growth habit and more green in colour. Some debate about the name in that it may be a sub species of E. horrida.
Best grown in container this is a species that requires a free draining potting mix, however is not as drought tolerant as many other succulents.
- During summer regular watering is required, each week in hot weather.
- Always allow the soil to dry between waterings.
- A low level to moderate humidity is best. High humidity can cause fungal problems.
- A little slow release fertiliser once a year is adequate.
- Position the plant in full sun with little protection from the hot afternoon sun in summer in hotter climate zones.
- Water from spring through summer as the growing medium dries and avoid long periods of dry soils. At the same time ensure that drainage is good. During winter dormancy, hold back on watering.
Flower & Foliage Characteristics
- Flower Colour: Deep purple
- Flowering Season: Spring
- Foliage Type: Minimal, ribbed stem with spines
- Foliage Colour: Bluish-green to deep green
- Autumn Colour: Not significant
Pruning and Maintenance
- No major pruning required
- Remove dead or damaged offsets if needed
- Handle with care – toxic sap can irritate skin and eyes
Propagation of Euphorbia polygona
- By Seed: Sow in well-drained soil; needs warmth to germinate
- By Division: Separate offsets or clumps; use gloves to avoid sap contact
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Ongoing Care Tips
Repotting
- Repot every 2–3 years or when offsets crowd the container
- Use gloves when handling
Dormancy
- Winter dormancy; reduce or withhold watering during this time
Common Issues
- Generally pest and disease resistant
- Avoid high humidity to prevent fungal issues
- Ensure good airflow around plant
Summary Information
- Botanical Name – Euphorbia Polygona
- Common Name – Snowflake cactus
- Family – Euphorbiaceae
- Height – To .5 metre, usually smaller in cultivation to around 30 cm
- Spread – To around 15 – 30cm cm across over time
- Growth Rate – Slow
- Flowers – Deep Purple.
- Flowering Time – Spring
- Soil – Well drained
- Position – Full sun to part shade.