Q&A: Best Time to Plant Perennials

Plant large-sized perennials in early fall, and they'll perform better in the garden come springtime.

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Q: What are the advantages, if any, of planting perennials like yarrow and delphinium in the fall?

A: Early fall is a good time to plant larger sizes of perennials (if they are available) because the weather is cool and reduces stress on the top parts of the plants. The soil also stays warm and allows the roots to grow, helping the plants to get established in the landscape. In the spring when the plants come out of dormancy, they should perform better than if they were planted in the spring and asked immediately to bloom (in addition to rooting and becoming established). Note that smaller-sized plants from small pots may not root deeply enough to avoid heaving during the freeze-thaw cycles. However, planting larger plants in fall generally works well.

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