Euphorbia francoisii
Growth rate: It is a slow growing species and tubers take many years to enlarge.
Soil and pots: It likes pots with generous drain holes, needs a very airy potting medium.
Exposure: This plant has an excellent heat tolerance, and need full sun to light shade exposures, but can tolerate shade.
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.
Hardiness: Tender. Keep the plant cooler in winter but maintain the light as bright as you can so that any growth which it may produce at this time will not be etiolated. It can be grown outdoors in the summer months to benefit from direct exposure to light, and especially exposure to high summer temperatures. Protection in a warm greenhouse in the middle of the winter will greatly increase the survival rate.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz
