Answer: There are many different types of euphorbia. Euphorbia lathyrus or gopher purge is an annual and is planted in spring as with any other typical annual. Flowering spurge (Euphorbia corollata) is a native perennial and can be grown from seed as well. Most of the named euphorbias however are propagated from cuttings or divisions. To start the perennial types from seed, chill the seeds for a week (place in a plastic bag or closed container with some slightly moistened peat moss and place in refrigerator), then soak in water for several hours and plant in a warm, well drained soil mix (temperature of 75 to 80 degrees). The seeds should germinate in two to three weeks.
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