The real achievement when you plant a sunflower is by harvesting its seed, and it's usually done during the fall season. Your harvest competitors include birds, deer and squirrels so it's important that you should be one step ahead of them. The proper time to harvest them is when you notice that the petals are dry enough and starts to wither. Here are some other details on when and how to harvest sunflower seeds.

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Source: Gardening Know How