The encyclopedia of perennials helps you select and care for perennials. Learn all about your favorite perennials in the encyclopedia of perennials.

Globe Thistle

Globe thistles are perennials that produce metallic-blue blossoms with perfectly round flower heads atop ribbed stems. The spiny-edged leaves are white and woolly underneath. Learn how to grow these blue beauties.

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  • Agapanthus, Lily of the Nile

    Agapanthus, Lily of the Nile

    The Agapanthus, Lily of the Nile, is a perennial flower that has gorgeous blue or white florets arranged in large globes for a wonderful addition to the garden. Learn about agapanthus. See more »

  • Alstroemeria, Lily of Peru

    Alstroemeria, Lily of Peru

    Alstroemerias, or lilies of Peru, are lilylike perennials with trumpet-shaped flowers. Flowers come in pink, rose, purple, yellow, cream, orange, and white and are great in garden containers and flowerbeds. Learn about these showy flowers. See more »

  • Amsonia, Bluestar

    Amsonia, Bluestar

    Amsonia, or bluestars, are popular garden plants, and they grow wild in wooded areas and on river banks from New Jersey to Tennessee to Texas. Learn more about this easy-to-grow perennial. See more »

  • Anemone, Japanese

    Anemone, Japanese

    The Japanese anemone's name comes from the Greek word for wind. Its showy flowers can reach a height of four to five feet. Find out more about this poppylike perennial. See more »

  • Anota Violacea Orchid; Rhynchostylis Violacea Orchid

    Anota Violacea Orchid; Rhynchostylis Violacea Orchid

    Orchids are among the most beautiful flowers. Learn about growing the Anota violacea orchid, also known as the Rhynostylis violacea orchid. See more »

  • Aster, Michaelmas Daisy

    Aster, Michaelmas Daisy

    Aster, or michaelmas daisy, is a North American flower that grows in wayside places with no care at all. You'll find garden asters in many sizes and colors. Find out about these perennial flowers. See more »

  • Astilbe, Garden Spirea

    Astilbe, Garden Spirea

    Beautiful perennials for the garden, the astilbes, or garden spireas, available today are usually the result of hybridization. Color may be white, pink, lavender, or cranberry. Learn how to grow this versatile flower. See more »

  • Avena Grass

    Avena Grass

    Avena grass, or blue oat grass, has yellow flower spikes in summer and silvery blue leaves. This interesting plant makes a fine structural accent and will thrive in a dry, sunny area. Learn more about this distinctive plant. See more »

  • Avens


    Avens, a member of the rose family, sprouts brilliant blooms appropriate as garden borders or in front of rocks. Easy to grow, avens prefers cool summers. Learn more about avens at How Stuff Works. See more »

  • Balloon Flower

    Balloon Flower

    The unopened flowers of platycodons resemble hot-air balloons, for which they are named. The buds of these perennials open to bell-shaped flowers in pink, blue, and white. Learn about the balloon flower. See more »

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