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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallBlue flowers can brighten a garden from spring through fall, but the best choice depends on your site: sunlight, soil moisture, space, and local climate. “Blue” in a plant listing may also mean blue-lavender, violet, or blue-gray, and many plants come in several colors. Use the 20 options below to narrow your choices, then confirm the exact cultivar and regional suitability before planting.
How to choose blue flowers for your garden
Start with the growing conditions you can provide, not the color name. Iowa State University Extension’s perennial list gives useful approximate heights and light preferences for a Midwestern garden, but it is not a universal planting guide. Check hardiness and local nursery guidance for your area and the cultivar you intend to buy. Iowa State Extension’s blue-flowered perennials
- Match light and moisture: Sun-loving choices include catmint, lavender, and globe thistle; great blue lobelia suits part shade to shade in Iowa State’s list.
- Allow for mature size: Compact Carpathian bellflower is listed at 6–12 inches, while delphinium reaches 36–50 inches in the same list.
- Check the actual flower color: Blue descriptions may encompass blue-lavender, violet, purple-blue, or blue-gray. Confirm the named cultivar rather than assuming a species will produce a particular hue.
- Plan by season: Blue-flowered plants include spring woodland flowers and bulbs, summer perennials, and annuals such as cornflower; planting dates vary by region.
20 blue-flowered plants to consider
These choices include perennials and other garden plants, and many are available in colors beyond blue. Heights and light preferences below are included where Iowa State Extension’s table provides them; they are approximate and should not be treated as universal performance guarantees.
1. Catmint (Nepeta × faassenii)
A sun-loving perennial listed at 12–24 inches, catmint has blue or white flowers in early summer and can bloom for a long period. It is a practical option for a sunny spot where a lower-growing plant is preferred. Iowa State Extension
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2. Perennial geranium (Geranium hybrids)
Blue-flowering cultivars are available, with sun to part shade listed as suitable. Iowa State describes the flowering season as early summer and long-lasting; check the cultivar label for its specific color and size. Iowa State Extension
3. Spiderwort (Tradescantia species and hybrids)
Spiderwort grows in sun to part shade, and blue is among its available flower colors. The group includes species native to the United States, though the exact traits and regional suitability depend on the species or hybrid. Iowa State Extension
4. Perennial sage (Salvia × sylvestris)
This sun-loving perennial is offered in blue as well as violet, pink, and white. Look for a named cultivar if a particular shade is important. Iowa State Extension
5. Lupine (Lupinus hybrids)
Blue is one of several colors available among lupine hybrids. Some lupine species are native to the United States, but a hybrid’s hardiness and performance should be checked against local conditions. Iowa State Extension North Carolina State Extension
6. Carpathian bellflower (Campanula carpatica)
A compact choice for sun, this bellflower is listed at 6–12 inches and can produce blue, purple, or white flowers. The color varies, so check the cultivar listing. Iowa State Extension
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7. Clustered bellflower (Campanula glomerata)
Clustered bellflower grows in sun and is listed at 12–24 inches. Its clustered blooms may be blue, white, or purple. Iowa State Extension
8. Peachleaf bellflower (Campanula persicifolia)
This sun-loving bellflower has a broad listed height range of 12–48 inches. Its bell-shaped flowers are available in blue and other colors, making cultivar selection especially useful when planning around a specific height or hue. Iowa State Extension
9. Delphinium (hybrids)
Delphiniums bring tall flower clusters to sun or part-sun gardens; Iowa State lists them at 36–50 inches. Their regional role can differ substantially: UF/IFAS describes delphinium as a cool-season bedding plant in Florida, rather than treating it as a universal perennial recommendation. Check local growing guidance before choosing one. Iowa State Extension UF/IFAS
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Iowa State lists this plant for part shade to shade. It is short-lived and spreads, so allow for its tendency to increase rather than treating it as a fixed-size specimen. Local conditions matter when selecting a planting site. Iowa State Extension
11. Pincushion flower (Scabiosa hybrids)
A sunny garden can suit pincushion flower; ‘Butterfly Blue’ is a popular blue or lavender selection. Verify the named cultivar’s flower color and growing requirements when buying. Iowa State Extension
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12. Spike speedwell (Veronica spicata)
Spike speedwell grows in sun, and deep blue is among its listed flower colors. Cultivars can differ, so use the plant label to confirm the shade you want. Iowa State Extension
13. Globe thistle (Echinops ritro)
For a distinctive flower shape in a sunny position, consider globe thistle. Its spherical blooms are described as blue, blue-gray, or white, rather than one guaranteed shade of blue. Iowa State Extension
14. Sea holly (Eryngium amethystinum)
Sea holly adds architectural, thistle-like blooms to a sunny garden. Flower descriptions include blue, purple, and blue-gray, so the exact appearance depends on the selection. Iowa State Extension UF/IFAS
15. Balloon flower (Platycodon)
Balloon-shaped buds distinguish this sun-loving plant. Blue-violet is one of its described color options; check the cultivar for the flower color being sold. Iowa State Extension
16. Lavender (Lavandula angustifolia)
Lavender needs sun and well-drained soil. Iowa State Extension advises choosing cold-hardy cultivars, an important distinction for gardeners in colder climates. A cultivar’s flower tone may read as blue or lavender rather than a saturated blue. Iowa State Extension
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- DAILY COLOR TRANSFORMATION FOR VISUAL VARIETY: Flowers start in brilliant blue during morning hours and fade to soft pink tones before closing in the evening. Each bloom lasts just one day, but their consistent succession gives the garden a dynamic, ever-changing appearance full of depth and charm.
- EXCELLENT CHOICE FOR STRUCTURE-BASED DESIGN: The plant's climbing habit allows you to create decorative shapes and figures using simple supports. Whether you want to form archways, dividers, or hanging cascades, this morning glory adds natural form and color with minimal maintenance and creative freedom.
17. Bluebeard (Caryopteris)
Bluebeard grows in sun and may have blue, lavender, or white flowers. Cultivars also differ in foliage traits, so compare the full plant description rather than selecting by flower color alone. Iowa State Extension
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Bottle gentian suits sun to part shade and blooms in late summer. Its blue or white flowers remain partly closed, an unusual feature that sets it apart from open-faced garden blooms. Iowa State Extension North Carolina State Extension
19. Russian sage (Salvia yangii)
Russian sage grows in sun and produces flowers in blue or lavender tones. It may still appear in listings under its former botanical name, Perovskia atriplicifolia, so either name can help when checking plant labels. Iowa State Extension
20. Stokes’ aster (Stokesia laevis)
Stokes’ aster is a U.S.-native plant that grows in sun and is available in blue and other colors. Confirm local suitability and cultivar details before planting. Iowa State Extension
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Spring woodland plants and bulbs
Virginia bluebells and woodland phlox are options for spring woodland settings. Grape hyacinth and Siberian squill provide blue-toned spring flowers as bulbs. Their suitability and planting timing depend on climate and site, so use regional guidance rather than assuming one calendar applies everywhere. North Carolina State Extension North Carolina State Extension Iowa State Extension
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Cornflower (Centaurea cyanus)
Cornflower is a hardy, low-maintenance cool-season annual that can be grown from seed. North Carolina State Extension advises starting seeds indoors six to eight weeks before the last frost, or direct sowing outdoors in fall in mild-winter climates. It prefers full sun to light shade and medium-moisture, well-drained soil. The advice comes from North Carolina guidance; local frost dates and climate affect timing elsewhere. North Carolina State Extension
Cornflower can reseed readily. Deadhead to reduce volunteer seedlings, or leave some seed heads if you want to retain seed for birds and butterflies. North Carolina State Extension
Blue-flowered clematis
Blue-flowered clematis cultivars offer a vine option when you want flowers on a vertical support. Color and growing needs vary by cultivar, so check the individual plant listing rather than treating all clematis as blue or interchangeable. North Carolina State Extension
Can hydrangeas have blue flowers?
Some mophead and lacecap hydrangea cultivars can produce blue flowers under acidic soil conditions, but hydrangeas are not all blue. Soil changes are not a reliable way to make an unspecified hydrangea cultivar blue; select a suitable cultivar and follow regional guidance for its care. UF/IFAS
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Willowleaf bluestar: a blue-flowered plant with a longer wait
Willowleaf bluestar (Amsonia tabernaemontana) is another option when you can wait for an established plant. Wisconsin Extension says it grows best in full sun, tolerates partial shade, prefers moist loam, and can tolerate many soils including clay. Once established, it resists drought. Seedlings may take two to three years to flower, according to the University of Wisconsin–Madison Extension’s 2026 revision; cultivars differ in size, flower color, and hardiness. University of Wisconsin–Madison Extension
Quick Recap
Regional and cultivar checks before planting
- Use extension recommendations from your own region when available; Iowa, Florida, North Carolina, and Wisconsin guidance reflects different climates and is not one shared planting calendar.
- Check the botanical name and named cultivar on the plant label. Species and hybrids may vary in color, height, hardiness, and other traits.
- Compare the plant’s light and moisture preferences with your actual garden conditions, then allow room for its mature size and any tendency to spread.
- Ask a local nursery or extension service about hardiness and planting timing if the plant is unfamiliar in your area.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
