Decorative Double Blend Dahlias are showstopping flowers that bring a sense of abundance to any garden. These cultivars of Dahlia pinnata produce full, layered blooms in a mix of colors, each petal precisely arranged in the characteristic decorative form. Hardy in zones 7 through 11, they thrive in full sun and moderate water, rewarding gardeners with weeks of continuous flowers from midsummer onward. Starting seeds indoors 8 to 10 weeks before your last frost and transplanting after frost danger passes gives you the strongest plants and earliest blooms.
Full Sun
Moderate
7-11
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High
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The decorative form itself is the draw here, with perfectly arranged petals that create a full, almost formal appearance quite different from single-petaled or pompom varieties. The double blend color mix means you'll get a range of hues in a single packet, adding spontaneous variety to bouquets and garden beds without having to commit to separate varieties. Dahlias in general are prolific bloomers once established, and these doubles reward attention with flowers that keep coming until frost.
Decorative Double Blend Dahlias are grown primarily for cutting and display. The full, layered blooms hold up exceptionally well in bouquets and arrangements, making them popular with gardeners who like to bring flowers indoors. They're also strong performers in garden beds and borders where their formal appearance and continuous flowering add structure and color from summer into fall.
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Start seeds indoors 8 to 10 weeks before your average last frost date. Sow in biodegradable pots filled with moist seed-starting mix, as dahlia roots are sensitive to disturbance and benefit from minimal transplant shock. Maintain soil temperature at 65 to 70 degrees Fahrenheit for reliable germination.
Transplant outdoors 2 to 4 weeks after your average last frost date, once soil has warmed and frost danger has completely passed. Space plants 18 to 24 inches apart to allow for mature growth and good air circulation. Harden off seedlings gradually over 7 to 10 days before moving them to their final garden location.
You can sow seeds directly in the garden 2 to 4 weeks after your average last frost date, though starting indoors is recommended for earlier blooms and stronger plants.
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