Answer: It is best to wait until mid to late summer if you can. If you move them now they will not bloom this summer. Water them well the day before you dig. Cut the foliage down to about six inches. Carefully dig up the clumps, do not damage the rhizomes with your tools. Save only vigorous outer portions of the rhizomes, discard old ones and any that show signs of rot or borer damage. Label them by writing on the foliage, if desired. Shake or rinse off excess soil and allow to air dry for a few days. Select a new site that is in full sun all day long and has rich, well drained soil. Plant about a foot apart. To plant, loosen the soil down about a foot and work in some compost. Dig a hole and make a mound in the center of it. Set the rhizome on the mound and drape the roots down the sides of the mound. Fill in with soil. The rhizome should be at the soil surface, barely covered with soil. Do not plant too deeply or it will rot. Water thoroughly to settle any air pockets. Mulch around but not over top of the rhizomes. Keep the area weeded.
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