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Carnivorous plants, such as these pitcher plants and fly traps, are sold as natural pest-killers at the Carnivorous Plant Nursery booth at the Spring Garden Market at River Farm on April 15, 2011.Shaun Norris looks at carnivorous plants at the Carnivorous Plant Nursery booth during the Spring Garden Market at River Farm on April 15, 2011. Located on the banks of the Potomac River, River Farm oA customer listens as Paul Murphy, right, explains size characteristics of heath and heather plants at the Hickory Hill Heath & Heather booth at the Spring Garden Market at River Farm on April 15, 201Organizers expected about 20 local and regional vendors for the Spring Garden Market at River Farm on April 15, 2011.Carol Siegel, left, listens as Bill Boone, right, explains the root system of a hellebores plant at the Spring Garden Market at River Farm on April 15, 2011. Boone operates Chesapeake Landscape and DeDarlene Spring waters plants at her son's Spring Thyme Nursery booth during the Spring Garden Market at River Farm on April 15, 2011.Margie Lloyd, center, helps Nancy Raley, right, inspect a tamukeyama (Japanese maple) tree at the Cedar Creek Gardens booth during the Spring Garden Market at River Farm on April 15, 2011.Lily Adkins, left, pushes a make-shift cart with her family's purchases during the Spring Garden Market at River Farm on April 15, 2011.