The Peony Revolution
Tree peonies require similar cultural parameters. They differ from herbaceous ones in that they should be mulched heavily going into winter. A 3” to 4” layer of material over the root zone will help delay them from pushing new growth too early in the spring. Tree peonies should not be cut down to ground annually but rather be grown like a shrub and be renewal pruned after blooming as needed. In addition, tree peonies may benefit from a slightly more acidic soil, as manganese tie-ups may cause nutrition problems in some varieties. When planting, make sure the graft union is 2-3 inches below the soil surface to allow the plants to develop their own roots rather than solely relying on the grafted herbaceous root for its sustenance.
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