Rhubarb Rhubarb (Rheum rhabarbarum) is one of the first perennials to come up in spring. This is a plant for cooler regions since it cannot withstand heat above 90F. Well-drained soil amended with rich manure is ideal for growing this vegetable. Sections of rhubarb roots should be planted in early spring and the soil kept moist. Since the clumps can grow 3-4 feet across, sufficient… [read more]