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Step 1
Remove the potted parent bog plant from its aquatic home. Drain off any excess water, and get the soil out of the pot using a shovel or spade.
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Step 2
Inspect the runaway roots of the bog plant for healthy-looking, large rhizomes. These thick branches of stem will be used to grow new plants, and you can generally extract several usable rhizomes from a single bog plant, depending on its size and species.
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Step 3
Cut the rhizomes you want to use away from the body of the remainder of the plant, taking care to follow the rhizome up to its starting point and snip it off in its entirety. Use a precision cutting tool to ensure that you don't snap or break the stem as you cut it off.
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Step 4
Fill a new pot approximately three-quarters full of enriched soil, ideally of a type that's specifically made for water plants. A visit to your local nursery will yield a wide range of suitable soils and fertilizers. Pick up a 10-20-10 fertilizer while you're there, and mix in 10 grams of it for every gallon of soil you use.
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Step 5
Plant the extracted stems in the new pot of soil, keeping the rhizome to one side of the pot and positioning it so it will grow out and up. To facilitate this, expert gardeners recommend that you orient the transplanted stem at a 45-degree angle.
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Step 6
Top up the pot with enriched, specialized soil. Leave only about 1/4 inch to 1/2 inch of the transplanted rhizome exposed to the air, and add a generous amount of water.
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Step 7
Return your newly potted divided plant to its home in the bog. Monitor its progress closely, making sure it receives ample water in its early life.
