Origin and Natural Habitat
Euphorbia obesa is endemic to a small area of the Great Karoo near Graaff-Reinet, in the Eastern Cape of South Africa.
Plant Characteristics
This Euphorbia obesa is the highly sought after crested form. Instead of the well known globose shape of the typical plant, the crested form has fan-like and ridged stems. It does tend dichotomize and produce multiple crested stems. This particular plant has a large crested stem as well as a secondary crested offshoot.
This plant was seed grown at the Living Desert Plants nursery. It is not a degrafted or imported plant.
Care Guide
Light
This Euphorbia species prefers semi-shade, or lightly filtered sun. In cultivation, a maximum of 40% shade cloth is recommended. This encourages stronger colouration and a more compact growth form while preventing sun damage. Do not plant in shade.
Soil
Euphorbia obesa prefers a gritty, inorganic soil medium that drains well, such as Ibaraki Akadama or Hyuga pumice.
Water
Euphorbia obesa must only be watered in spring and summer. This plant should receive a thorough soaking of water every 7-10 days during the active growing season, but only if the soil is mostly dry. Keep dry in autumn and winter.
Pot size
This species should be grown in a container that is about 3-5cm wider than the base of its stem. When small, it can be grown in 10-12cm pots, but with time will need a larger pot.
Temperature
This species’ ideal temperature ranges between 20 – 30°C. It is quite adaptable and can tolerate 5 – 40°C. It is sensitive to frost and should be protected in winter.
Humidity
This species prefers dry conditions and should not be kept in areas with more than 50% humidity.
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
This Euphorbia grows actively in spring and summer, and their growth stops in autumn and winter.
Propagation
Euphorbia obesa are best propagated from seeds.
Seed germination: Seeds should be sown in early spring. Plant them in a mix of coco peat and perlite, with some vermiculite, in an airtight container. Once most of the seeds have germinated, remove the lid of the container to allow airflow. Gently mist the seedlings every few days so that the soil does not dry out.