Growing Radishes: Radishes are generally very easy to grow. They are both fast to appear and fast to mature and therefore are a perfect choice for a child's first garden.
They perform best when sown in spring or late summer but with care can be planted from February to September in most areas (Northern hemisphere). Plant small amounts, five to seven days apart for a steady supply. Radishes do prefer cool weather and become pungent (hot) with warmer weather. They are also likely to bolt (go to seed) in warmer weather.
Plant seeds directly outdoors in as soon as soil can be worked and soil temperatures are about 45F. Plant ½ inch deep, ½ inch apart in rows at least 8 inches apart. Firm soil and keep moist until seedlings appear. Radishes have shallow root systems do keep watered. Harvest as soon as roots reach desired size. They become woody with age.
Radishes are a great snack food as they have about 100 calories per pound and contain vitamin C.