This intriguing, rather tall plant has strong, square-sectioned, dividing stems bearing heads of many pinkish-blue flowers, and thick rough leaves and is ideal for a hot spot or very back of border where the flowers can do of their best. Although it comes from the beaches and hills of Hawaii, and is native to the Americas from Mexico south through Central and South America to Argentina and Chile, it seems to be perfectly hardy in the cold UK! ... Learn More

The "Mountain Blue Vervain" comes from the southern states of the USA where it grows at altitude amongst rocks and gravel. The flowers, which grow on the ends of thick, rough-leaved stems, bear a striking resemblance to lavender, slowly opening down the long poker of buds, rather like a burning firework. ... Learn More

New verbenas appear very rarely but this brand new plant has been discovered in the Argentinian Andes. Swarms of widely-spread, gypsophila-like white flowers on strong, branching rough stems are profusely produced all summer long. ... Learn More

Deep blue spires of flowers sit upon serrated lime green leaves. A classic cottage garden plant. Perennial. ... Learn More

A splendid plant for the back of the border, it produces winged stems clad with long narrow leaves and bears from August to late autumn numerous long-stalked sprays of many green-centred, yellow flowers, each two inches or so across. Your bees will absolutely love this flower as it is one of the best bee plants of the eastern United States, where it has been christened, you will never guess, "Wingstem"! ... Learn More

Dividing stems carry numerous bright golden daisies with sharply pointed petals in early and midsummer on this lovely and very unusual mid-border flower. ... Learn More

This new plant carries flat heads of deepest purple daisies flowering on strong stems in September and October. Valuable late colour when almost everything else in the garden has died away. Associates well with late cimicifugas and aconitums. ... Learn More

Hardly resembling a gentian, but extremely lovely nonetheless, is this compact plant bearing many spires holding largish pale blue flowers. The glossy green basal foliage is an added bonus! ... Learn More

Appropriately named, this rare plant is from Japan. With slowly lengthening royal blue spires, up to 30cm long, and 60-90cm stems lightly clad with pointed sawtooth leaves, it flowers until late September. ... Learn More

Striking blue-violet flowers on long branching stems emerge from bushy clumps of vivid green foliage. Growing well in full sun and freely draining soil, it is perfect for cutting, and the bees and butterflies will love this plant as much as you. It makes a great summer display that will benefit from staking to ensure the beautiful blooms remain upright and on display, and is easily propagated by division at either end of the season. ... Learn More

This dwarf mutant forms dense mats of very deeply divided, almost fern-like leaves, and short dumpy spikes of light blue flowers. It is perfect for growing in a trough or small alpine garden rather than a large rockery. ... Learn More

Numerous long, graceful, pointed spikes of brightest blue flowers open from June until late summer. This popular, long-flowering herbaceous border plant also produces excellent cut flowers. Very long-lived, and bone-hardy, it will gently self-seed to places where little else will grow! ... Learn More

Handsome individual spikes of blue flowers on tall strong stems sparsely clad with encircling leaves. In autumn, all leaves turn bright yellow, and this was how we spotted it through the trees when collecting seed on Sakhalin Island, Russia (RBS0290). ... Learn More

This lovely tender perennial can be easily-grown as an annual, flowering prolifically in hot, dry climates and relatively infertile soils. The glossy green leaves provide a background for attractive, five-petaled flowers, which range from pink, red, purple to white and bi-colored flowers. It is valued for its hardiness in dry and nutritionally deficient conditions,and is popular in subtropical gardens where temperatures rarely fall below 5 °C and as a warm-season bedding plant in temperate gardens. It is noted for its long flowering period, throughout the year in tropical conditions, and from ... Learn More

The "Altai Pansy" is a rarely seen plant with unusually large, deep cobalt-blue flowers with a tiny yellow eye, above compact clumps ofb dark green, very narrow, lanceolate leaves. It is native to meadows and rock crevices from south western Russia through eastern Asia. It flowers over a long period from May until September and will do well in any humus-rich, well drained soil in a sunny to partially shaded spot, where with luck it will gently self-seed. ... Learn More