Early radishes will have far fewer worm-holes than late summer radishes. Maintaining Plant Health Give your plants the nutrients, water, and light they need for steady, vigorous growth. The requirements vary for different plant species. Some plants need lots of light, while others cannot tolerate full sun. Light levels and soil moisture should be addressed in the garden planning stage because physical placement may determine these levels.
Nutrient demands vary, too.
Do a little reading to see what type of nutrients each plant needs and then add soil amendments such as lime, bone meal, and compost to provide what is required. Follow individual plant recommendations for watering. A common mistake is to water too often and too shallowly. A long slow soaking is usually preferable to a short heavy watering, much of which may run off. Don't apply water faster than the soil can absorb it.