Blue Perennials in Zone 7
Blue is often a difficult color to find for the garden because many flowers labeled "blue" are really more of a lavender or purple. Nevertheless, a full roster of true-blue plants exists, many of them perennials that return each year, especially in United States Department of Agriculture plant hardiness zone 7, where the low temperature is zero degrees Fahrenheit. Does this Spark an idea?
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Spring
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Bulbs such as muscari and scilla offer blue flowers for spring, although both multiply quickly and can become invasive. Forget-me-nots and brunnera bloom with sprays of tiny blue blooms. Low growers include Lithodora Grace Ward and creeping veronica varieties Georgia Blue and Waterperry Blue.
Summer
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Agapanthus blooms with clusters of small blue trumpets in summer. Aconitums and delphiniums produce tall stalks studded with blue blooms. Catanache produces light blue blooms, as does Amsonia hubrichtii, borage and blue flax. Anchusa provides bright blue blooms on sprawling plants. Echinops offers glowing blue-blushed thistles. For shade, try Himalayan blue poppy or Corydalis Blue Panda.
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Fall
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Ceratostigma (plumbago) blooms in blue in early fall. Most gentians bloom in fall with deep-blue flowers; a few also bloom in spring and summer. Bog sage (Salvia uliginosa) displays true blue blooms on tall stems in late fall.
Other Choices
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Other blue perennials include tiny alliums, blue-star creeper, blue anise sage (Salvia Black & Blue), dwarf forms of columbine, perennial bachelor button (Centaurea montana, a spreader) bluebeard (caryopteris), eryngium, blue pulmonaria varieties and symphytum.
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References
- Photo Credit Small Blue Flowers image by Cambo from Fotolia.com
