Answer: There may be two possibilities for the blooms to get progressively smaller. First - if your geranium is a purchased plant rather than one you grew from seed - it had absolutely perfect growing conditions in terms of light, water and fertilizer when it was at the nursery or greenhouse. Without this constant attention, the blooms will naturally be smaller. While you probably can't provide exactly 16-hours of light a day, you can compensate by feeding weekly with a quarter-strength dilution of liquid fertilizer, and by watering regularly. (Water stress can reduce the number and size of blossoms.) A second suggestion is to promptly remove flowers as they begin to fade. If you leave spent flowers on your geranium, the plant will direct most of its energy into producing seeds rather than producing new blooms. Be sure to cut away the faded blooms and the stem, all the way back to the main stem of the plant. Hope these suggestions help you grow fabulously blooming geraniums!
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