Himalayan Blue Poppy
The Himalayan Blue Poppy (Meconopsis betonicifolia) is a gardening real head-turner. The plant is native to the mountains of southeastern Tibet. Flowers bloom from May to July. Tall leafy stems bear a succession of single scintillating, silky blue flowers, 8 to 10 cm (3 to 4in) in width with contrasting yellow stamens.
Blue Butterfly Larkspur
Blue Butterfly Larkspur (Delphinium grandiflorum) has just the bluest gentian-blue flower. The plant is also called Chinese Larkspur or Siberian Larkspur, because the native range of the species includes northern China, Mongolia, & the steppes of eastern Siberia. The individual blossoms are not on a spike like most larkspurs, but a bit more subtle than other genus. Unlike other types of delphinium which reach impressive heights, Blue Butterfly delphinium is more diminutive, measuring about 12 to 18 inches. Blooms from late spring through early summer.
Eastern Bluestar
Eastern Bluestar (Amsonia tabernaemontana) is a perfect pick for blue flowers. This erect-stemmed perennial wildflower is native to the southern and southeastern United States, and northern Mexico. The plant is about 2-4' tall with elongated leaves that are lance-shaped and light-green growing on smooth, erect stems. It produces bright blue star-shaped flowers appearing in fluffy clusters at the tips of the stems. Each flower has a tube shaped corolla with five spreading lobes. Flowers bloom in late spring.
Lily of the Nile
Lily-of-the-Nile (Agapanthus africanus) is native to South Africa. The plant is an evergreen perennial with strap-shaped leaves and erect stems. The flowers are somewhat lily-like in rounded clusters (umbels) of light to deep blue or white, funnel-shaped flowers. Blooms in summer.
Jack Frost Brunnera
'Jack Frost' (Brunnera macrophylla) is a perennial plant grown for its exquisite silver and green variegated foliage, and sprays of small bright blue Forget-me-not flowers. It is commonly known as Siberian Bugloss or False Forget-me-not. Excellent for the woodland garden, flowers appear in April to May.
Brazilian Blue Sage
Brazilian Blue Sage (Salvia guaranitica) 'Black & Blue' is a species of Salvia native to a wide area of South America, including Brazil, Paraguay, Uruguay, and Argentina. This perennial shrub is also known as Sapphire Sage for its incredible jewel-bright blooms. The cultivar 'Black & Blue' have fairly large (one- to two-inch) long, tubular two lipped cobalt blue flowers, which are held at their bases by near-black calyces. Flowering period starts in August to October.
Borage
Borage (Borago officinalis), also known as a Starflower, is an easy growing annual gangly plant. It is native to the Mediterranean region. The 15–25 mm (0.6–1 in.) wide flowers are vivid blue and star-shaped with five triangular-pointed petals. They’re a true blue, although pink flowers are sometimes observed. There is a cultivar of borage that produces white flowers as well. Bloom Time: June to August.
Blue False Indigo
Blue False Indigo or Blue Wild Indigo (Baptisia australis), is a native American beauty. It is a bushy, robust perennial in the family Fabaceae (legumes). Baptisia australis is a standout because of its striking indigo-blue pea-like flowers. The flowers, about 2.5 cm long (1 inch) are borne on long racemes. Bloom Time: May to June.
Siberian Squill
Siberian Squill (Scilla siberica) is a spring bulb plant. It bears tiny, nodding, sky blue–dark blue, star-like flowers. The flowers have six petals and six white stamens with dark blue tips. Flowers are arranged singly or in racemes of two or three at the top of a slender naked stem. . Each flower is about 1 inch across when fully open. Bloom Time: April.
Cornflower
Cornflower or Bachelor's Button (Centaurea cyanus) got the name because they grew wild in European corn fields. Centaurea cyanus is an annual plant growing to 16-35 inches tall, with grey-green branched stems. It bears charming true blue flowers. Each disc-shaped flower is about 1.5 inches across, with ragged petals radiating out from the center. Bloom Time: May to July.
