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Hi Jennifer, Flower bloomsHi Jennifer, Flower blooms depends on soil, amount of sun exposure, variety of flower, fertilizer, and many more factors. If it helps, here are some "best bets for window boxes" and growing tips:  http://www.almanac.com/content/window-boxes-best-bets

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?