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Sunflowers have deep taprootsSunflowers have deep taproots so it is important to turn over the soil and add compost to at least 2 feet deep. They are also heavy feeders so adding a slow release granular fertilizer to the soil will benefit the plants. Instead of amending the soil you can try to grow sunflowers in deep containers.

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