Planting Instructions: 
Radishes are generally very easy to grow.  They are best when sown in spring or late summer but with care can be planted from February to September.  Plant small amounts, 5 to 7 days apart for a steady supply.
Plant seeds directly outdoors as soon as soil can be worked.  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 so do keep them watered.  
Harvest as soon as roots reach desired size.