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Overwintered Perennials Indoors: When to Plant Out?

Keep delphinium indoors until after last frost (late April in zone 5). Harden off 7–10 days before planting. It may not bloom this summer because forced winter blooming depletes energy. Perennials need winter dormancy to reset. Plant out, water, mulch, and expect blooms next year.

Perennials: Why Dahlias Won't Bloom: The Stress-to-Flower Strategy; Fall Planting Rudbeckia and Echinacea in North Carolina; Canterbury Bells, Zinnias, and Long-Lived Indoor Flowers; Establishing Lacecap Hydrangeas: Mulching, Watering, and Pruning for Future Blooms; Why Daffodils Grow Leaves But No Flowers: The Late-Planting Trap; Mimosa Tree Identification and Saving a Stressed Dogwood; Crocus in the Lawn: Squirrels Did It; Overwintering Container Perennials in Colorado; Dividing Newly Purchased Perennials: Risks and the Role of Harpin Protein; Sun-Loving Perennials: Gaura, Blanket Flower, Coreopsis, and "Chameleon"

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