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Most sunflower varietiesMost sunflower varieties blooms 55 to 75 days after planting. Find the number of days to maturity on your seeds packets. As long as it blooms by your first first, it's OK to plant. You can your first fall frost dates here: http://www.almanac.com/content/frost-chart-united-states Your frost is probably around early October so they may flower in time.

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