September is a good time to transplant both of these plants. If you have never moved a peony before, take care. The roots break easily. Cut the foliage to the ground. Prepare the new site, mixing in compost. If you are in the upper midwest, set the "eyes" 2 " below ground level and closer to ground level in the warmer parts of the midwest. Planting eyes too deeply may inhibit blooming. Firm the soil as you go and water thoroughly. Mulch for winter and make sure the soil doesn't dry out this fall. Hostas are more forgiving but it makes since to add compost to the site when you prepare it. Plant at the same level it was. It isn't necessary to cut down the leaves prior to transplanting but trim off any burnt, tattered ones.
Answered on August 23, 2017
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