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What you need:
  • Sharp knife
  • 8" pot
  • Seedling mix
  • Sand or grit

Root division is an easy way to propagate some fleshy-rooted perennials. First dig up the plant and wash the roots. Select large roots, about the thickness of a pencil, and cut them off near the crown of the plant.
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Trim the roots to around 4" in length. Make a straight cut on the side that was closest to the crown. Make a diagonal cut on the other end.
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Fill an 8" pot with moist seedling mix. Make several holes in the planting medium with a pencil and insert the cuttings, with the end that was closest to the crown facing upwards. Push the cuttings into the soil so that the tops of the cuttings are flush with the surface of the soil mix.
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Top-dress the cuttings with 1/2" of sand or grit. Once the cuttings have started producing shoots, lift the individual plants and pot them individually.
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If you are taking cuttings from plants with thinner roots, lay them horizontally in a tray filled with moist seedling mix. Cover the cuttings with soil mix and firm them in.