Easy-to-grow root vegetables Many gardeners enjoy raising turnips and rutabagas because they are easy to grow and cold hardy. While both have best quality in cool weather, there are important differences between them.Turnips are a form of Brassica rapa, the same species as bok choy and Chinese cabbage. Their quality can be poor when they grow in hot weather, or if they grow too large. Eat turnips while they are still young and tender. Their flesh is usually white, and you may eat them raw, co...