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such as chrysanthemums, kalanchoe, azaleas and begonias, will thrive on less than 12 hours of light per day. In fact, these plants must usually go through a series of even shorter days before they will set buds and flower. require 14 to 18 hours of light each day. Most seedlings for vegetables and garden flowers are long-day plants. When they don't receive enough light they get pale and leggy. including foliage plants, geraniums, coleus and African violets, are usually satisfied with 8 to 12 hours of light all year-round. NOTE: Don’t be tempted to leave the lights on 24 hours, however – at least six hours of darkness each day is essential to plant health. When it's dark, plants respirate, which is an important part of their growth process. The balance of rest time to active growth time affects many biological processes, including the growth rate, and the setting of buds and fruit.







