Their flavor is sweeter and crunchier than traditional radishes. The exterior is white/greenish, but the heart is bright red/pink. They are also known as Daikon, which means large root in Japanese.
Watermelon radishes are winter radishes, so it's best to plant them in the garden 2 months before the first fall frost at a depth of 1/2'' and a distance of 2''. Opt for very rich soil that has been deeply worked. They can reach a diameter of 3'', but they will have optimal flavor when they are around 2''.