This is Euphorbia "Diamond Frost" It is heat and drought tolerant. Grows only 12-18 inches. It is an excellent plant for mixed containers.
Bethie I have a run of the mill yellow euphorbia and every bit of the plant is poisonous. Is it the same with your one or can it be handled without gloves on?
Eileen, it didn't mention poisonous on the label but I always wear gloves to keep my hands soft. I'll throw them in the washer just in case.