Blue Mirror carries true ultramarine in a form that stays compact and airy. Fine, lacy foliage is covered with sprays of small trumpet-shaped flowers, creating an 18–24-inch cloud of blue rather than the formal towers of traditional delphiniums.
This heat-tolerant Chinese delphinium blooms its first year when started early and returns in Zones 3–7. The nectar-rich flowers draw hummingbirds and butterflies, while the compact stems slip naturally into informal bouquets.
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Botanical name: Delphinium grandiflora
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Life cycle: Perennial; blooms the first year
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Hardiness: USDA Zones 3–7
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Exposure: Full sun
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Sowing: Start indoors 8–10 weeks before the last frost
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Planting depth: 1/4 in.
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Germination: 21–28 days
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Mature height: 18–24 in.
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Final spacing: 10–12 in.
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Approximate seed count: 29–30
Cut each finished flush to the base to invite rebloom, and keep the blue sprays coming with regular water. Discover more distinctive varieties in our flower seed packets.
