Colorful and crisp, radishes are a popular addition to salads and vegetable trays. Radishes mature very quickly—some in as little as 3 weeks. They’re a useful marker crop when sown lightly along rows of slow germinators such as carrots and parsnips.
Related: Easy Ways To Eat Radishes 
Try out these 10 Easy Soil Tests  to ensure that your soil is ready to grow these delicious root vegetables. Then dig the soil to a depth of 6 inches for quick-growing radishes and up to 2 feet for large, sharper-tasting, slower-growing winter types. Space seeds ½ inch deep and 1 inch apart; firm the soil and water gently. Make weekly spring sowings as soon as you can work the soil (4 to 6 weeks before the last expected frost) until early summer; start again in late summer. Sow winter radishes in midsummer for a fall harvest.
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Thin seedlings to 2 inches apart, 3 to 6 inches for the larger winter types. Try Mulching Ruth Stout Style  to keep down weeds. For quick growth and the best flavor, water regularly.
Companion Planting for Insect Control
Sow Radishes amid hills of cucumbers and squash to repel cucumber beetles. Plant them near spinach. Radishes attract leafminers away from the spinach. The damage the leafminers do to radish leaves doesn't prevent the radishes from growing nicely underground.
Related: The Benefits of Growing These Plants Side-By-Side 
Cabbage maggots are attracted to radishes but seldom ruin a whole crop. Although some of the Top Ten Garden Insect Pests  can be detrimental to your crops, they can be controlled.
Pull as soon as the roots mature. Oversized radishes often crack and are tough or woody.