Light:

Full sun exposure (a southern window, greenhouse, etc.).

Temperature:

Maintain indoor temperatures above 60 degrees, preferably 65 degrees.  They are warm growers.

Humidity:

Preferably 50% or higher; however, they will tolerate low levels with no harm.

Watering:

Bring soil to a state of visual dryness between very thorough waterings. Planting in a clay is preferred.  Do not allow the plant to go into a severe wilt.

Fertilizer:

Fertilize with a balanced soluble fertilizer, i.e. 15-15-15, every two weeks at ½ tsp./gallon of water.  Reduce the frequency during the winter months, especially under cool temperatures.

Pruning:

Prune after flowering is completed.  Pruning between spring and mid-summer (August) is preferred.   

Insects and Disease:

Euphorbia is very susceptible to root disease and somewhat susceptible to white fly.

Comments:

Euphorbia is a short-day bloomer.  Bringing it to flower is similar to the poinsettia, requiring periods of total darkness.  Much care must be taken in watering, as root rot is a significant problem.