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Browse Plants

Narrowed By:Type: Perennials+ Characteristics: Attracts Butterflies+ Flower Color: Blue+ Seasonal Interest: Summer
Displaying 1 - 20 of 38 listings   1 | 2View AllNext > Sort By: Sort
Agastache ‘Blue Fortune’ Agastache ‘Blue Fortune’
(Blue Fortune hyssop)
(2 user reviews)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

'Blue Fortune' produces spikes of powder-blue flowers held over large, deep green foliage. The plant stands approximately 36 inches tall with a mature width of 18 inches. Peak bloom occurs in midsummer when butterflies are plentiful.

Agastache foeniculum 'Golden Jubilee' Agastache foeniculum 'Golden Jubilee'
(Anise hyssop)
(1 user review)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Anise hyssop has subtle but eye-catching chartreuse foliage. Its powder-blue, long-lasting flowers contrast nicely with its leaves.

Amsonia hubrichtii Amsonia hubrichtii
(Arkansas blue star)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Arkansas blue star's delicate, willow-like foliage is topped with pale blue star-shaped flowers in spring. The light green foliage looks good all summer, turns a beautiful golden-yellow in fall, and can stand through most of the winter, adding interest especially when mixed with grasses and other attractive seedheads. It grows to almost 3 feet tall and wide.

Aster × frikartii Aster × frikartii
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This plant flowers profusely and for an exceptionally long time, from early summer to mid-fall. Its flowers are violet-blue.

Aster dumosus Aster dumosus
(New York aster, Michaelmas daisy)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This is a short-growing aster with lilac-blue flowers and creeping rootstocks. Many cultivars exist. It can be used on steep slopes for erosion control.

Aster macrophyllus Aster macrophyllus
(Bigleaf aster)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This striking, richly-textured, deciduous ground cover has heart-shaped leaves that turn mauve in autumn. Purple, blue, or white flowers appear in late summer to early fall.

Aster tataricus Aster tataricus
(Tatarian aster)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Tatarian aster is an impressive, stately perennial with a flowering height of 3 to 6 feet. It can look you in the eye yet require no staking. More important, this aster flowers longer than any other garden aster, beginning in late September and early October and continuing into November. The 1-inch-wide, light lavender flowers are a magnet for local and migrating monarch butterflies. This plant tolerates many soil types, can form large colonies in a few years, and is easily divided.

Aster tongolensis Aster tongolensis
(East Indies aster)
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This is a mat-forming aster with thick, almost leafless stems that support solitary, violet-blue ray florets and orange-yellow disk florets.

Baptisia australis Baptisia australis
(blue false indigo, Plains false indigo)
(2 user reviews)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

False blue indigo's spikes of clear blue flowers in late spring can nearly carry a border by themselves. They also make great cut flowers. Large, inflated nearly black seed pods set in after flowering, giving this plant another interesting element. It is low maintenance and will look great in any natural or informal setting.

Campanula lactiflora Campanula lactiflora
(Milky bellflower)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This upright bellflower grows to 4 or 5 feet with rounded leaves and conical spires of bell-shaped flowers in shades of blue, violet, or white.

Delphinium 'Bluebird' Delphinium 'Bluebird'
(3 user reviews)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

'Blue Bird' is a Pacific Hybrid delphinium grown as an annual or biennial. Its mid-blue flowers have white centers. The flowers are large but short-lived and bloom on tall stems from early summer to midsummer. Grow at the back of a border or in the middle of an island bed. There is nothing quite like delphiniums in the garden.

no image available Delphinium 'Delft Blue'
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Belonging to the Belladonna Group hybrids, this delphinium bears loose, branched spikes of intense blue flowers with soft white edges. It may rebloom if deadheaded. The cultivar name pays homage to the resemblance of the flower color to Delft pottery.

Delphinium elatum Delphinium elatum
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

The parent of the regal hybrid Delphiniums, the species has 3- to 4-foot-tall spires of blue, violet, lavender, or white flowers. It usually requires staking.

Nepeta × faassenii 'Walker's Low' Nepeta × faassenii 'Walker's Low'
(Catmint)
(11 user reviews)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This mound of lavender-blue flowers and aromatic, grayish green leaves up to 2 feet tall and 3 feet wide is great as edging or in a border, herb, or rock garden. It is an easy to grow, prolific bloomer that seems to be deer resistant. It blooms the whole summer and tolerates some shade. It also looks great with roses or on walls.

Nepeta × faassenii ‘Dropmore’ Nepeta × faassenii ‘Dropmore’
(Catmint)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This cultivar is a clump-forming perennial with toothed gray-green leaves and larger flowers than the hybrid. It flowers profusely and long, especially if sheared. The blue-purple flowers are small but abundant, and the foliage is aromatic.

Polemonium caeruleum Polemonium caeruleum
(Jacob’s ladder, Greek valerian)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This North American native bears deep blue or occasionally white, bell-shaped blossoms in spring and possibly late summer if deadheaded. It grows from 1 to 3 feet tall. Use Jacob's ladder in a lightly shaded border, rock garden, woodland, or cottage garden.

Polemonium caeruleum 'Brise d'Anjou' Polemonium caeruleum 'Brise d'Anjou'
(Variegated Jacob’s ladder, Greek valerian)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This dramatic cultivar has bright green leaves that are richly edged with cream. It bears lavender-blue blossoms in spring, and grows from 1.5 to 2 feet tall.

no image available Polemonium reptans 'Stairway to Heaven'
(Greek valerian, Jacob’s ladder)
(1 user review)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This variegated cultivar offers white-edged leaves with pink tints on a compact plant to 1.5 feet tall. It bears light lavender-blue bell-shaped blossoms in spring.

Ruellia brittoniana 'Purple Showers' Ruellia brittoniana 'Purple Showers'
(Mexican petunia, Common ruellia, Wild petunia)
(7 user reviews)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This three-foot-tall evergreen shrub bears many tubular, blue or purple, petunia-like flowers on dark stems over a long period. Each flower lasts for just one day. It is a fast grower that may self-seed aggressively. Use in a border, container, or at waterside. Can be grown as an annual in cooler areas.

no image available Salvia 'Mystic Spires Blue'
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Throughout the summer, 'Mystic Spires Blue' produces long stalks of dark blue flowers, which continue to reward in abundance when deadheaded. Refresh tired plants in midsummer by cutting them back by half. This cultivar makes an excellent bedding or container plant.


Displaying 1 - 20 of 38 listings   1 | 2View AllNext > Sort By: Sort