Best Blue Flowers for Your Garden

Blue flowers add a cool touch to the landscape. Check out some of our favorite blue flowers.

Blue Hydrangea

A big, sky blue hydrangea flower is absolutely breathtaking. Get your bigleaf hydrangeas to turn clear, sky blue by increasing the acidity of the soil. Adding soil sulfur is one way to do this.

Here's a hint: Bigleaf hydrangeas can be shy bloomers. Most flower on last-year's growth, so if you need to prune them, do so right after they finish flowering. And look for newer varieties such as Endless Summer, which produce flowers on both new and old growth.

Name: Hydrangea macrophylla selections

Growing Conditions: Morning sun and afternoon shade with moist, well-drained soil that's rich in organic matter. Don't let bigleaf hydrangeas get too dry.

Size: To 7 feet tall and wide, depending on variety

Zones: 4-9, depending on the variety

Grow it with: Blue bigleaf hydrangeas look stunning when paired with white-flowering varieties such as 'Annabelle' hydrangea or oakleaf hydrangea.

Perennial Geranium

There are lots of garden-worthy perennial geraniums, but 'Rozanne' is one of the best. This top-notch perennial flowers from June to frost, producing a nearly endless supply of violet-blue flowers.
Plant Name: Rozanne Geranium 'Gerwat'
Growing Conditions: Full sun or part shade and moist, well-drained soil
Size: To 2 feet tall and 3 feet wide
Zones: 4-8
Plant it with: Because the geranium starts flowering in early summer, pair it with spring-blooming bulbs such as grape hyacinth, blue crocus, and white daffodils.

Delphinium

Delphiniums offer some of the truest-blue flowers in the garden. In many areas, the plants are a bit fussy (delphiniums prefer regions with cool summers) -- though many gardeners find these regal flowers well worth the extra effort.
Here's a hint: Stake taller delphinium varieties to keep the blue flowers from toppling over in the wind. Grow them in soil that's rich in organic matter. In poor soil, fertilize them with a general-purpose product to keep them looking their best.
Plant Name: Delphinium selections
Growing Conditions: Full sun to part shade and moist, well-drained soil
Size: To 6 feet tall and 1 foot wide, depending on type
Zones: 3-7, depending on type
Grow it with: Blue-flowering dwarf delphiniums such as 'Butterfly Blue' or 'Summer Nights' look fantastic with the yellow blooms of Coreopsis 'Moonbeam' or Gaillardia 'Fanfare'.

More Home Decoration Tips: If you want to know more about home decoration tips, please refer to Dream Bedding Sets Blog to get more ideas.

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