Top 7 Biennial Flowers for the Garden

Biennials are the enigmas of the garden. They hang out and take it easy their first year, storing away energy for a flashy entrance the following year. Their first season, they focus on growing lush foliage and strong roots. The real show starts in their second year when your patience is paid off with a razzle dazzle of flowers. Then they die. Yes, biennials only stick around for 2 years, but most have a generous nature and reseed themselves for an even bigger show in future years. Some are so...MORE reliable, they are mistaken for perennials.

  • 01 of 07

    Canterbury Bells (Campanula medium)

    Canterbury Bells (Campanula medium)
    Photo: R.A. Howard, hosted by the USDA-NRCS PLANTS Database

    Most of the bellflowers are perennial but not Canterbury Bells. This quintessential English cottage flower has long racemes of boxy bell-shaped flowers in vivid blue and soft pink, lilac, and white. These are mid-season bloomers that grow from 1 - 3 ft. tall. Full sun.

  • 02 of 07

    Forget-me-not (Myosotis)

    Forget-me-not (Myosotis)
    Photo: bereflex / stock.xchng

    These bright blue flowers are one of the hallmarks of spring. one of the best self-sowers. If you find they are taking over, simply deadhead or remove some plants before they go to seed. Forget-me-nots prefer full sun and moist soil. They make a great cover for the fading foliage of spring bulbs.

  • 03 of 07

    Foxglove (Digitalis)

    Foxglove (Digitalis)
    Photo: © Marie Iannotti

    There is a perennial foxglove, but most foxgloves are biennial. The plants are fairly large, even in their first year, with long, rough, but not unattractive, leaves. Depending on the variety, the flower stalks can reach up to 5 ft. tall, with the dangling trumpet-shaped flowers that attract all kinds of bees, butterflies, and hummingbirds to your garden. Flowers come in yellow, pink, and purple, with speckled throats. Full sun to partial shade.

  • 04 of 07

    Hollyhock (Alcea rosea)

    Hollyhock (Alcea rosea)
    Photo: © Marie Iannotti

    If you’re looking for something tall and eye-catching, you can’t go wrong with hollyhock. Topping out at 6+ ft., they were used to disguise outhouses and there is still an heirloom available called ‘Outhouse Hollyhock’. With double or single flowers in yellow, red, pink, purple and white, there’s one for every garden. Plant in a large cluster, so the tall stems can help support each other. Blooms July - Sept. Full sun. Butterflies.

    Continue to 5 of 7 below.
  • 05 of 07

    Honesty (Lunaria annua)

    Honesty (Lunaria annua)
    Photo: alfi007 / Stock.xchng

    Butterflies and children love this plant, and so do I. The mid-season clusters of purple flowers are lovely, but it’s the “silver dollar” seed pod that makes these plants so charming and give it its common name, the Money Plant. The seed pods can be easily be dried and preserved. 2 - 3 ft. (h) Partial shade. Moist soil.

  • 06 of 07

    Stock (Matthiola)

    Stock (Matthiola)
    Photo: Patrick J. Alexander, hosted by the USDA-NRCS PLANTS Database

    Many flowers promise scent, but stock really delivers, with a strong, spicy fragrance. These are early bloomers that prefer the cool temperatures of spring. There’s a wide choice of colors, in white, pink, lavender, yellow and deep reds. The plants don’t grow particularly tall and make nice edging plants. There are dwarf varieties that reach less than 1 ft. and others that approach 3 ft. Matthiola longipetala and M. Incana are 2 of the most popular species. Matthiola Bicornis releases its scent...MORE at night. They also make nice cut flowers. Full sun.

  • 07 of 07

    Sweet William (Dianthus barbatus)

    Sweet William (Dianthus barbatus)
    Photo: sumeja / Stock.xchng

    The spicy clove scent will tell you that Sweet William is in the carnation family. This is a tidy plant, with grass-like, low-growing foliage and flatten dome flower heads. The velvety flowers come in reds, pinks, purples and bi-colors. If you keep them deadheaded, they will repeat bloom through late spring into summer. Full sun. Butterflies.

Keep Your Biennials Coming Back

If you want blooms every year, rather than every second year, start another seedling or planting of biennials during the first planting’s second year. Year 1: Start seeds or seedlings Year 2: Last year’s biennials will bloom, then go to seed. Start more seeds or seedlings to bloom next year. Year 3: Seeds from 1st planting of biennials will sprout and just grow foliage. The second planting will bloom, then go to seed. Year 4: From here on, some plants will be going to seed and other flowering every year.