Answer: Lilies can grow into impressive sized clumps and should be divided after a few years to give them elbow room and to promote lots of blooms. Since the bed is in need of renovation, why not roll up your sleeves and attack the problem from the ground up? Use a fork instead of a shovel, and dig up the clumps of lilies. Remove the weeds, including their roots, from both the bed and the clumps of lilies. Divide the lilies, making sure no weed roots cling to them. Then dig some organic matter into the bed, replant the lilies, and place a thick layer of organic mulch over the bed. The mulch will help suppress weeds, retain soil moisture, and release nutrients as it decomposes. After all your hard work, you shouldn't have to deal with weeds for a long time to come.
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