Euphorbia knuthii

Origin and Habitat, Southern
Description: Euphorbia knuthii is a dwarf spiny succulent shrublet with a tuberous main root, which continues into a serpentine caudex, freely branched from the top. It is sometimes accompanied by a number of underground rhizomes. It is closely allied to Euphorbia squarrosa, and Euphorbia Schinzii. It blooms in mid to late summer and the seed capsules ripe about one month later.
Cultivation and Propagation: Euphorbia knuthii is an easy ornamental plant to grow, and is a particular favorite of caudiciform plant enthusiasts. Cultivation of this plant is the same as that for the other tuberous varieties of Euphorbia, (e.g. Euphorbia stellata, Euphorbia decidua, etc.), but it is the easiest of all caudiciform Euphorbias to propagate from cutting. It tolerates any conditions (it is practically indestructible), surviving extended neglect and relatively low light.
Stem pruning: Every year or two in very early spring, trim off all of the stems, cutting them back to the soil line (or to the roots if you grow your plants with the roots partially exposed). After this pruning, allow the plant to heal at least a week to ten days before watering it. The heavy pruning encourages the growth of many additional branches and keeps the length of each branch comparatively short, and uniform.
Exposure: full sun to light shade exposures,
Watering: Water regularly during the active growing season. No water should ever be allowed to stand around the roots. Keep almost completely dry in winter. Even though it is extremely drought tolerant, during the active growing season it is best to keep its soil reasonably moist, watering it about once every week. In summer it will also tolerate lots of water
Hardiness: tolerate temperatures down to –6ºC and even a little snow. (USDA Zones 9-11).

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz

Bloom Season	Late summer
Bloom Season	Late summer, early fall
Botanical Name	Euphorbia knuthii
Dormancy	Winter
Family	Euphorbiaceae
Flower Color	Pale green
Genus	Euphorbia
Growth Habit	Columnar
Growth Rate	Fast
Hardiness Zone	10, 11
Hardiness Zone	10 11(USDA)
Mature Size	3 ft. tall
Mature Size	3 ft. tall, 2 in. wide
Native Area	South Africa
Plant Type	Dwarf spiny succulent
Plant Type	Dwarf spiny succulent, shrub
Propagation	By cuttings
Propagation	By cuttings, offsets
Resistance	Drought tolerant
Resistance	Drought tolerant, pest resistant
Soil PH	6.5
Soil PH	6.5, Acidic, Neutral
Soil Type	Succulents potting mix soil
Special Features	Easy to grow
Sun Exposure	Full sun
Sun Exposure	Full sun, partial shade
Toxicity	Toxic for humans
Toxicity	Toxic for humans, toxic for pets
Watering Needs	Low