Ratibida pinnata Yellow Coneflower Sun: Full Soil: Sand,Loam,Clay Moisture: Dry,Medium,Moist Height: 3'-6' Bloom: Yellow Jul-Sep Yellow Coneflower (Ratibida pinnata) grows in almost any soil! This striking prairie flower produces a cornucopia of bright yellow flowers in the heat of mid-summer. Amazingly durable, it survives heat, drought, flooding, and winter cold. Easy to grow from seed or transplants, this is a strong perennial and classic prairie flower. Hardy to Zones 3 - 9.