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Photos of a seed bank In mature woodlands and prairies, the similarity between the existing plants and the seed bank decreases markedly over time since any previous disturbance. For example, most prairie species here at Doolittle Prairie in Story County are perennials that grow from existing root stock, lessening the importance of seeds. Disturbance-loving species accumulate viable seeds and lie waiting in the seed bank in case the prairie is plowed, overgrazed or otherwise disturbed. Though normally wet and lush, water levels in Polk County's Engeldinger Marsh were significantly lowered by last fall's drought. Though they temporarily create unattractive mudflats, periodic dry spells help a wetland's long-dormant seed bank take advantage of extra light to germinate. New seedlings should appear at Engeldinger this spring. Photo by Tom Rosburg One method of assessing a seed bank is to collect soil samples, then separate, identify and study the seeds. Photo by Tom Rosburg Another method is collect samples and then germinate the seeds under controlled conditions. Return to Secrets of a Seedbank For more information, e-mail Cathy Engstrom, director of communications, or call (515) 288-1846. © Copyright 2008 Iowa Natural Heritage Foundation Comments? Suggestions? Email INHF Webmaster