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Mammoth Russian Sunflower The Mammoth Russian Sunflower is a species of sunflower that can grow 6 ft or higher. They sprout 2 weeks after planting and need lots of sunlight and water until fully grown. To harvest the seeds, cut the flower when fully blooming and hang upside-down in a dork, cool, space. In about a month you can harvest the seeds and dry them in sunlight. It is best to sprout a sunflower in a small pot and when it is 4 in. high to plant it in the ground and surround it with a fence so rabbits can't get to it.