When planting wildflowers in the spring, temperatures need to remain above freezing. Find the average final frost date for your area, then plant seeds after that date. If you are planting in the fall, you'll need to sow perennial seeds at least 10 weeks before the first frost.
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Aileen Clarkson has been an award-winning editor and reporter for more than 20 years, earning three awards from the Society of Professional Journalists. She has worked for several newspapers, including "The Washington Post" and "The Charlotte Observer." Clarkson earned a Bachelor of Arts in journalism from the University of Florida.