Origin and Natural Habitat
Euphorbia trichadenia is native to tropical southern Africa, with its range extending from Angola to Botswana, and down into north-eastern South Africa.
Plant Characteristics
Euphorbia trichadenia is a caudiciform species with a large, underground tuber. It produces annual, lance-like leaves in spring and summer. The caudex can be grown aboveground in cultivation to give it a more aesthetically pleasing appearance.
Care Guide
Light
Euphorbia trichadenia prefers a sunny location in the greenhouse. Avoid keeping this species in shade. If kept outside, 40% shade cloth is preferred and it can be carefully adjusted to full sun.
Soil
This species requires a well-draining soil mixture with plenty of gritty components. A medium with akadama and pumice is preferred.
Water
In cultivation, Euphorbia trichadenia can be watered well during the warmer months. During spring and summer, give it a thorough watering every 7-10 days. During winter, it is important to stop watering completely.
Pot size
Euphorbia trichadenia‘s caudex can grow up to 15cm tall and up to 20cm in diameter, so a large pot is required once mature. A 10cm pot will be sufficient initially, but as the plant grows older, it should be planted in a pot that is 3-4cm wider than its caudex to accommodate new growth.
Temperature
This Euphorbia’s ideal temperature ranges between 25 – 30°C. It can tolerate 5 – 40°C. This species is sensitive to frost and should be protected during winter in frost-prone areas.
Humidity
Euphorbia trichadenia is sensitive to humidity. Make sure that your growing space has plenty of airflow, particularly in winter, as this species is prone to stem rot during dormancy.
Fertilizing
Use a half-strength diluted general liquid fertilizer only during the growing season. Do not fertilize during winter. Alternatively, a small amount of slow-release fertilizer will be sufficient.
Growing season
Euphorbia trichadenia only grows from early spring until late summer.
Propagation
Euphorbia trichadenia can only be propagated through seed germination.
Seed germination: Seeds should be sown in early spring. Plant the seeds in a coco peat mix in an airtight container, and cover them with fine sand. Once most of the seeds have germinated, remove the lid of the container to allow airflow. Gently water the seedlings every few days so that the soil does not dry out.