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Long-Blooming Northwest Shrubs

The Northwestern portion of the United States includes Washington, Oregon, Idaho, Montana and Wyoming. The U.S. Department of Agriculture places portions of these states in Plant Hardiness Zones 3a to 9b. Examine the USDA map to determine into which zone your city falls. These zones identify which plants can grow successfully in an area based on its typical weather patterns. Suitable shrubs for Northwest gardens include a number of long-blooming plants.

  1. Hydrangeas

    • Hydrangea arborescens “NCHA1” is sold under the trade name Invincibelle Spirit. This smooth hydrangea produces pink flowerheads from June to November and is suitable for Zones 3 to 9. It grows 3 to 4 feet high and wide and enjoys partial shade with well-drained soil. This shrub is not drought-tolerant. Expect white blooms from June to September when you plant the Hydrangea arborescens "Ryan Gainey." It likes partial shade but can handle full sun if provided with constant moisture. This shrub grows 3 to 4 feet high and wide in Zones 3 to 9.

    Roses

    • Roses with a long-blooming pattern include Rosa "Baioire," which produces soft pink flowers from May until frost. It needs a sunny site in Zones 4 to 9. This shrub reaches a height and width of 4 to 5 feet. It likes regular, deep watering and slightly acidic soil. Another rose delivering blooms from spring to frost is the Rosa "Hansa," a shrub with crimson-purple, fragrant flowers measuring 3 inches across. It grows 4 to 5 feet tall and 3 to 4 feet wide. This shrub enjoys full sun and good air circulation. It is suitable for Zones 3 to 8.

    Butterfly Bush

    • Buddleja davidii “Black Knight” produces dark purple spikes of flowers from June to October. You can grow it in full sun in Zones 5 to 9. It reaches heights of 6 to 8 feet and widths of 3 to 5 feet. The plant’s fragrant flowers attract butterflies. The colorful insects also like Buddleja davidii “Butterfly Heaven.” It produces light purple flowers from June to October. This butterflybush likes full sun and reaches a height and width of 3 to 6 feet. It prefers moderately moist, well-drained soil in Zones 5 to 9.

    Rose of Sharon

    • Hibiscus syriacus “Aphrodite” offers pink blooms with dark red centers from June to October in Zones 5 to 8. It grows 6 to 10 feet high and 4 to 8 feet wide. You’ll see the best flowering from this shrub if you plant it in full sun. It will tolerate partial shade, urban conditions, poor soil and some drought, according to Missouri Botanical Garden. White flowers bloom from June to October on the Hibiscus syriacus “Notwoodtwo.” It reaches a height of 5 to 8 feet and a width of 4 to 6 feet in Zones 5 to 8. The shrub can grow in full sun or partial shade and can be pruned in late winter or early spring.

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Shrubs
  1. Photinia Shrubs
  2. Shrubs for Dappled Sunlight
  3. Shrubs to Make Mazes
  4. Compact Blooming Shrubs
  5. Conical-Shaped Shrubs
  6. Large Sunny Shrubs
  7. Zone 4-5 Shrubs
  8. Pollution-Tolerant Shrubs
  9. Vermont's Flowering Shrubs
  10. Salt Tolerant Blooming Shrubs
  11. Hearty Shrubs
  12. Front-Gate Shrubs

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