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We used to have a birdfeederWe used to have a birdfeeder out back until the racoons discovered it, so we took it down. The feeder had been there 15 years, so lots of seeds overflowed into a pile for years. This year we got a pleasant surprise when the sunflower plants began to grow. We now have one that's around 10 feet tall and exploding with flowers. I don't see what looks like a sunflower seed on any of the blooms. My question is how do we ensure we'll have sunflowers again next year in that same spot? Will they just sprout on their own or do we need to help? At what point do we cut the stalks down? Thanks so much!

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