Here are answers to some of the most common questions we receive about garden plants. You will find concise information on general gardening techniques as well as plant selection and care. For detailed information on specific plant pests and problems refer to our Common Garden Pests and Problems page.

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Horticulture Questions and Answers

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Why don't my radishes form bulbs?

Radishes are a cool-season crop that thrives in spring and fall when temperatures are in the 50 to 65 degree Fahrenheit range. They mature in three to four weeks and can tolerate light frost. When planted too late in spring or during summer, high temperates and dry soil can result in failure of the bulbs to form or the plants to flower without forming a  bulb. Other reasons can be overcrowding from failure to thin plants after germination; eedlings should be thinned to 1 1/2 to 2 inches apart. Applying excessive nitrogen fertilizer can also result in foliage growth instead of bulb formation. Finally, lack of enough sun can result in spindly plants that do not form bulbs. Radishes need atleast six hours of sun a day.