August is the month to thin or transplant German bearded iris and peonies.
Dividing fern leaf peonies is a bit more complicated than regular peonies in that they have a “neck” between the eye of next year’s growth and the tuber. Just cutting into the clump with a spade will often ruin a lot of the potential new divisions because of the way they intertwine.
The safest way to divide fern peonies is…
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