http://www.eatingwell.com/food_news_origins/seasonal_local/healthy_radishes
One of the first vegetables ready for harvest in the spring are radishes. The common ones you’ll see in supermarkets are White Icicle, Asian and Red Globe, but grow radishes at home and you’ll have your choice of more than 100 different varieties. Try Easter Egg radishes, a blend of the maroon-skinned Purple Plum, red Sno Ball, pink Rosa, White Icicle and red-and-white Sparkler radishes. Even if you don’t have a green thumb, radishes are easy to grow in containers and gardens; spring radish varieties are often ready in just three weeks and are more mild in flavor—hotter summer soil produces spicier radishes. What’s more, one radish has just one calorie.