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Browse Plants

Narrowed By:Type: Perennials, Trees+ Flower Color: Blue+ Moisture: Medium to Wet
Displaying 1 - 8 of 8 listings   Sort By: Sort
Clematis crispa Clematis crispa
(Marsh clematis, Blue jasmine, Curly clematis)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

A deciduous climber native to the southeastern United States, Clematis crispa bears lavender-blue, bell-shaped flowers with curly edges in summer. Its blooms are not profuse, but their elegant shape makes this plant a good choice for trellises, growing through shrubs, or planting in damp areas. The flowers are slightly fragrant and are followed by attractive seedheads. It also makes an unusual cut flower.

Iris brevicaulis Iris brevicaulis
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This pretty little blue-violet iris with yellow and white falls is native to the central U.S. Its early summer flowers are somewhat hidden among the foliage, as the stems are shorter than the leaves. In the wild, it grows in damp areas. In the garden, it appreciates a moist soil, especially in hot climates. Grow it where its flowers can be seen, such as at the front of a border, in a woodland, or at waterside.

Iris ensata Iris ensata
(Japanese iris)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This Laevigata iris bears 3 or 4 purple or red-purple blooms measuring 6 to 12 inches across, on single stems. Prominently ribbed leaves are 24 to 36 inches long. ‘Caprician Butterfly’ is a white, purple-veined cultivar.

Iris missouriensis Iris missouriensis
(Rocky Mountain iris, Wild blue iris)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This variable, beardless iris with narrow leaves to 20 inches long bears 2 to 4 blooms on each branched stem, in summer. The flowers have short, pale to deep blue or lilac-purple standards and larger falls with deep purple veining.

Iris sibirica Iris sibirica
(Siberian iris)
(1 user review)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Attractive, grass-like leaves to 18 inches long are topped by showy flowers in a wide range of colors. Flowers unfurl in May and bloom well into June. Cultivars include ‘Caesar’s Brother’, with rich purple flowers; ‘Eric the Red’, a bright violet-pink Siberian; and ‘Chilled Wine’, a garnet iris suffused with blue.

Lobelia siphilitica Lobelia siphilitica
(Blue cardinal flower, Great blue lobelia)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This clump-forming perennial has upright leafy stems. From late summer to mid-autumn, it bears dense spikes of light to bright blue tubular, two-lipped flowers with a more prominent lower lip.

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.

Salvia uliginosa Salvia uliginosa
(Bog sage)
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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This moisture-loving perennial produces clear blue flowers with white highlights in late summer to mid-autumn. It forms an airy clump to 6 feet tall by 3 feet wide, and is great for the back of a border. It is tolerant of heavy soils.


Displaying 1 - 8 of 8 listings   Sort By: Sort