Hummingbirds adore it! An annual salvia black colored stems and true cobalt blue flowers 'black and blue'.this is a must have for the sun garden or container. Planted here with Secretia 'Purple Palace'.
For a brilliant splash of purple, consider 'Sugar Plum' Coral Bells (Heuchera). I have it edging a long border with bluebells and a white evergreen candytuft plant ( don't know name). They soon reproduce themselves too, so are good value.
plumbago (Ceratostigma plumbaginoides, zones 5 to plant grows well in sun and part shade in all kinds of conditions all over the U. It chokes out weeds, blooms in a clear blue that reflects the summer sky and tops it off with fantastic fall color.