What Is the Most Common Blue Flowering Vine?

The common morning glory is true blue.

Truly blue flowers for the garden are hard to find because most flowers categorized as "blue" are closer to lavender or violet. The most common blue-flowered vine -- the heirloom annual morning glory, Heavenly Blue -- has been around for centuries, providing gardeners with blooms that mimic the summer sky.

True Blues

Butterfly pea vine

Two other blue morning glories are winners in the blue sweepstakes: Flying Saucers has lighter blue flowers with white swirls, and Blue Star boasts pale blue blooms. The annual butterfly pea vine (Clitoria ternatea) is fast-growing and covers itself with 2-inch lapis-blue flowers all summer.

Pretty Blue

Clematis Multi Blue

Pale blue Clematis Fuji-musume and the small, nearly navy-blue bells borne by Clematis Roguchi are probably the closest to blue available in a perennial vine. Popular clematis varieties marketed as "blue" (which all shade toward lavender or purple) are Multi Blue, Will Goodwin, Edouard Desfosse and Vyvyan Pennell. So-called blue wisteria is really a pale purple.

Lavender Blue

Blue passionflower

Other annual vines often referred to as "blue" include blue potato vine (Solanum crispum), blue-sky flower (Thunbergia grandiflora) and trailing snapdragon (Asarina scandens), all of which flower in lavender-blue. Passionflowers such as Blue Crown set off their large white petals with a fringe of tiny bluish ones.

References

• Donahue's Clematis Specialists: Blue Varieties
• Logee's Greenhouse: Thunbergia Grandiflora