For Zone 4 gardens, blue and yellow flowers can create a stunning and complementary color scheme. Here are some beautiful blue and yellow flowering plants that are well-suited for Zone 4:

Blue Flowers:

  1. Siberian Iris (Iris sibirica): Siberian Iris produces elegant, delicate blue flowers on tall stalks. They are hardy and thrive in moist soil, making them an excellent choice for borders or around water features.
  2. Delphinium (Delphinium spp.): Delphiniums are known for their striking spikes of blue flowers that add vertical interest to the garden. They prefer full sun and well-draining soil.
  3. Forget-Me-Not (Myosotis spp.): Forget-Me-Nots are charming, small blue flowers that are perfect for woodland gardens or as ground covers. They self-seed readily, providing a lovely carpet of blue blooms in spring.
  4. Balloon Flower (Platycodon grandiflorus): Balloon Flowers feature unique, balloon-like buds that open into beautiful blue star-shaped flowers. They are hardy and easy to grow.

Yellow Flowers:

  1. Black-eyed Susan (Rudbeckia hirta): Black-eyed Susans are bright yellow perennials with dark centers that add a burst of color to the garden. They are also excellent for attracting butterflies and pollinators.
  2. Coreopsis (Coreopsis spp.): Coreopsis, also known as Tickseed, produces cheerful yellow flowers with a daisy-like appearance. They are low-maintenance and thrive in sunny locations.
  3. Daylily (Hemerocallis spp.): Daylilies come in various colors, including shades of yellow. They are hardy and reliable perennials that bloom abundantly throughout the summer.
  4. Goldenrod (Solidago spp.): Goldenrods are tall, robust perennials with bright yellow flower clusters that are attractive to bees and butterflies. They are excellent for adding height to the garden.

Combining blue and yellow flowers in your Zone 4 garden can create a visually striking and harmonious display. When planting these flowers, consider their sunlight and soil requirements, and make sure to provide them with adequate water during dry periods. With the right selection and care, you can enjoy a beautiful and colorful garden throughout the growing season.