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I have about 20 sunflowers inI have about 20 sunflowers in my yard. Many of them have bloomed but some of them haven't opened yet. I planted them in March--I live in Florida. I would get them in the ground no later than May or RIGHT NOW if I were you. Many of them should be ready by Sept. They usually take about 90 days to flower from germination. Try buying starters to get a head start.

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