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Dense spikes of deep blue tubular flowers are produced from late spring to fall attracting a variety of pollinators including bees, butterflies, and low flying hummingbirds. Blue Bayou Agastache is a small to medium-sized herbaceous perennial with deep green fragrant foliage and excellent flower power. Reminiscent of Black Adder but in a more compact size that is better suited to small to medium sized container gardens as well as a long flowering addition to the sunny garden or landscape. Provide a full to mostly sunny location in a well-drained sandy soil for optimum vigor and flowering as well as the plant's longevity. Image courtesy of Walter's Gardens, Inc., all rights reserved. Item# 13297

This award winning Agastache produces tall spikes of deep purplish blue tubular flowers held on sturdy stems atop rich deep green fragrant foliage. The flower show lasts for an exceptionally long period and begins in early summer with butterflies, bees, and hummingbirds all showing up for the feast. A drought resistant perennial preferring well drained mostly sunny sites, Blue Boa Agastache requires minimal care and provides big rewards. Photo courtesy of TERRA NOVA® Nurseries, Inc. www.terranovanurseries.com. Item# 10918.

From spring to fall the Blue Butterfly Bush produces large clusters of dainty, blue flowers that very much resemble little butterflies and thus the name. This is a tropical plant that can be grown as a root hardy perennial in the northern portions of its range (zone 9 and warmer) otherwise it makes an easy to grow container plant. In its native habitat it can reach 10-12'H but more typically it is maintained as a 4-6'H shrub. The long canes lend it to use as an espalier. Item# 10681

Sturdy spikes of brilliant blue to lavender-blue, two-lipped flowers are borne for an exceptionally long period in late summer and into fall on this hardy, native, clump-forming perennial. Suitable for consistently moist to wet soils. The Blue Cardinal Flower is enjoyed by hummingbirds, butterflies, and an variety of other pollinators as well as making a beautiful cut flower. Images courtesy of North Creek Nurseries. Item# 10159.

A crown of deep sapphire blue filaments create a striking contrast with the white petals and sepals that are held against the rich green foliage throughout the growing season. The Blue Crown Passionflower is a vigorous growing tropical vine and can easily reach 20' once well-established. This is also one of the most reliably cold hardy Passionvines with foliage remaining evergreen in the mildest 8B winters but dying back to the ground in severe winters and returning readily in spring. The Blue Crown Passionflower may spread somewhat by rhizomes but it is generally much more tame than the Maypop. Cross pollination may produce tropical tasting tangy fruit that surrounds the dark seeds inside. Click on "More Details and Growing Info" or the image to learn more about growing Passionvines as perennials in containers or in the garden and landscape. Caterpillar host: Gulf Fritillary, Julia Butterfly, Variegated Fritillary, and Zebra Longwing. Item# 733

Large, 3-4", blue, cornflower-like daisies are born in summer on this durable and reliable US native perennial. Stoke's Aster comes highly recommended and its easy to see why with moderate drought resistance, few pest or disease problems, deer and rabbit resistance and it revels in the heat and sun of our southern summers. Plants readily multiply into dense clumps. Super easy and tough. Item# 1212.

Boasting bigger blue and more beautiful whorled clusters of nectar rich tubular flowers in tall wands that extend well above the gray-green foliage and last for weeks in summer. Blue Empire™ Bluebeard or Caryopteris was selected for its noticeably larger and longer lasting clusters of flowers as well as for its nicely compact habit further highlighting the tall candles of flower clusters. In zones 5-6 Bluebeard tends to act more like a clump forming die-back perennial and becomes more shrub-like where winters are milder, although, it benefits from hard late winter or early spring pruning since it flowers on new growth. Somewhat drought resistant once well-established and prefers a sunny site in a well-drained soil for optimum vigor and flowering. Images courtesy of North Creek Nurseries, all rights reserved. Item# 12248

Masses of dense blue spikes of fragrant, tubular flowers are held above the licorice scented, rich green foliage in summer on this highly sought after Agastache. The nectar rich flowers of Blue Fortune Agastache attract hordes of native pollinators and other beneficials to the garden. The beautiful form, fragrance, and flower power, and proven performance of this Agastache have made it a hit in gardens across the US. Use Blue Fortune in mass at the back of the border or in small specimen groupings to make a splash of long lasting color. Item# 10882.

The Blue Glory Vine produces 2-1/2" wide purple trumpets with yellow throats that are produced freely from spring to fall. A mounding and upright to spreading perennial to small (3-4'H) rambling climber, it is one of our favorite root hardy perennials for adding purple to a semi-shady area of the garden or in containers and it has excellent flower power. The Blue Glory Vine is happy in light shade to partial sun conditions but seems to prefer midday to afternoon shade in hot summer climates. It makes an easy container plant where not hardy. Item# 327

The large, 3-4'' wide, blue to lavender, Hibiscus-like flowers are produced throughout the warmer months of the year to year-round under warm frost free conditions. The Blue Hibiscus, Alyogyne huegelii, is an upright to rounded, naturally evergreen, Australian native shrub that is heat and sunloving and is somewhat drought resistant once well-established. It is fairly adaptable to soil types and moisture as long as they are provided with excellent drainage, otherwise it tends to be fairly short-lived. Full sun is optimal and it can be enjoyed both as a container plant as well as making a nice specimen or informal hedge in the garden and landscape. It is sometimes trained as a tree standard to good effect. Plants tend to be somewhat open and if foliage becomes too sparse or the plants too larger they can be pruned back fairly hard and will put out vigorous new growth and some sources suggest that it flowers best after a good pruning. Caterpillar host: Gray hairstreak. Item# 12881

With some of the deepest blue flowers of any Amsonia and a consistently compact habit, Blue Ice has become one of the most popular Bluestar cultivars on the market. The clusters of deep blue, starry flowers open from deep violet buds and will be sure to brighten any spring garden. Yellow fall color adds to its interest. Bluestars are pest, disease, and deer resistant perennials that are considered to be somewhat drought resistant once well-established. Item# 10652.

Flat topped clusters of bluish-purple Ageratum-like flowers are born atop sturdy stems in summer and sometimes into fall. Blue Mistflower is a rhizomatous colonizing native perennial that may be best suited to naturalistic settings or among larger growing plants as a tall groundcover. Excellent for pollinators, particularly native bees. Item# 10458

Large clusters of lightly fragrant lavender-blue flowers are produced in early spring and are held well above the deep dark green foliage. Blue Moon Phlox was selected for its clusters of large full flowers and vigor. This is an excellent choice for lightly shaded gardens or as a groundcover under deciduous trees. Provide shade during the hottest portion of the day in hot summer climates and well-drained soil rich in organic matter. Easy and reliable once established. The flowers provide early spring nectar to butterflies and other pollinators. Blue Moon Phlox along with the straight species Phlox divaricata tied for the Top Performer in Mt. Cuba Center Phlox for Shade trials. Item# 11217

2022 Missouri Botanic Garden Plants of Merit selection! One of the most amazingly blue colored flowers in the plant world! This small growing but vigorous annual or tender perennial vine produces loads of brilliant deep blue flowers with recurving and overlapping petals with a white to creamy yellow throat. It can be successfully overwintered but it's easier just to save a few seeds to plant in spring. Caterpillar host: Longtail Skipper. Item# 9114

Blue dye can be extracted from the blossoms!!

Blue, indigo, to purple 1/4" wide flowers adorn the long spike-like flowering stems from spring to frost and are held above the rich green glossy foliage. Blue Porterweed, Stachytarpheta cayennensis, is an intermediate growing Porterweed and has a fairly dense upright to spreading habit. An excellent choice for butterfly gardens or as a container plant. Also known as Blue Snakeweed, Verbena Azul, Cayenne Snakeweed. For the Florida native Blue Porterweed see Stachytarpheta jamaicensis. Item# 13080

Light blue to blue-purple 1/4" wide nectar-rich flowers adorn the tall narrow indeterminate flower spikes from spring to frost to year round under warm tropical conditions. Native to Florida and much of the tropical Americas, Blue Porterweed, Stachytarpheta jamaicensis, has smoother lighter green foliage and generally grows wider than tall whereas the other Blue Porterweed, Stachytarpheta cayennensis or S. urticifolia, has more rugose or quilted deeper green glossier foliage with a typically upright habit. Porterweeds are excellent pollinator plants where they attract a continuous menagerie of aerial acrobats from spring until frost. This a heat and sunloving tropical to tender perennial that can be added to gardens and landscapes or plant them in containers to draw the pollinators in for upclose viewing. Blue Porterweed is also a caterpillar host plant for the Tropical Buckeye butterfly. Item# 12046

Clusters and chains of large 3" wide purple-blue trumpet shaped flowers with contrasting yellow throats are produced throughout much of the growing season and attract larger bees and butterflies as well as the occassional hummingbird. The Blue Sky Vine, Thunbergia grandiflora, is an exceptionally popular tropical vine that is easy, reliable, has excellent flower power and it can be grown as a die-back perennial in zones 8-9 if established early in the growing season (click the "More Details and Growing Info" link or the plant's image to learn more). It may remain evergreen in warm frost free tropical climates where it can flower nearly yearround. The Blue Sky Vine is a heat and sunloving twining vine suitable for metal fences, smaller arbors, and medium to large trellises or other sturdy supports. Provide a well-drained, moderately fertile soil. The Blue Sky Vine can also be enjoyed as an easy and low-maintenance container plant. Item# 1108.

Pale blue frilly 1 to 1-1/2" wide daisies with a nicely contrasting yellow center are produced beginning in late spring and through summer often continuing into fall atop a neat mound of deep green foliage. The Blue Star Japanese Aster is a tidy under-used clump-forming perennial selected for its exceptionally long flowering season that is sure to add delightful color to the garden and landscape but it also makes easy and exceptionally long-flower container specimens. The flowers are sure to attract a multitude of pollinators. Provide a full to mostly sunny site with a well-drained soil for optimum vigor and flowering. Heat, sun, and humidity tolerant. Images courtesy of North Creek Nurseries, all rights reserved. Item# 11682

Deep purplish blue Iris-like flowers are produced on 2' high spikes are held above the upright to arching dark-green, textured sword shaped foliage. Blue Stars often begins flowering in spring and continues into summer. The overall appearance of this hardy rhizomatous African native is like an overgrown Blue-Eyed Grass. Blue Stars is a naturally evergreen clump forming perennial but the foliage my die back at temperatures below 20oF. Provide good drainage in an average moist rich soil with shade during the hottest portions of the day in hot summer climates. Makes an easy container plant where not hardy. Item# 11019

Dense broadly conical 3-4" high spikes of intense sapphire blue tubular flowers open from the bottom upwards with the first flowers to open creating the broad brim of the witches hat. Blue Witches Hat, or Hedgehog Sage, begins flowering in autumn and in areas where it is protected from frosts it can flower throughout winter and into spring. It is a medium to short day flowering plant. This tropical South African member of the mint family can develop into a shrub where winters are freeze and frost free reaching up to 8' high, 3-4' high in a container is more typical. Item# 11750