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Salvia greggii 'Blue Note' has blue-purple flowers blooming all summer, fragrant foliage and prefers hot dry spots.
Salvia gauranitica 'Black and Bloom' Nectar Blue is an improved, earlier blooming form of 'Black and Blue' with vibrant cobalt blue flowers with black sepals.
Salvia 'Black and Blue' produces truly vibrant cobalt blue flowers with black sepals by the thousands all season long.
Salvia 'Blue Marvel' has neat and tidy spires of purple buds and blue flowers.
Salvia 'Crystal Blue' offers a unique new colour for perennial sages with sky blue flowers.
Salvia reptans 'Autumn Sapphire' is a compact, late season cultivar with cobalt blue flowers and fragrant, willowy foliage.
Scabiosa Flutter 'Deep Blue' has larger, deeper blue flowers than 'Butterfly Blue'.
Scilla hyacinthoides 'Blue Arrow' looks like a rocket ship of starry blue flowers erupting from out of the border.
Scilla mischtschenkoana blooms early with palest blue, starry, bell-shaped flowers with royal blue midribs.
Portuguese squill, Scilla peruviana, has strap-like leaves and an exotic dome of small, star-like, royal blue to purple-blue flowers.
Scilla siberica is an easy and extremely hardy beauty with glowing blue, starry, bell-shaped flowers with royal blue midribs and dark blue pollen!
A neat clump-forming comfrey with light green crinkled leaves. The blue flowers fade gradually to light blue.