Its pyramidal 10-inch trusses of lavender-blue flowers bloom in mid-May and smell like honeysuckle.

Most have simple five-petaled flowers in shades of pink, rose, white, purple and lavender-blue.

Campanula poscharskyana (Serbian bellflower, trailing bellflower) is a semi-evergreen trailing perennial, valued for its lavender-blue star-shaped flowers, native to the Dinaric Alps in former Yugoslavia.

In my garden, the lavender-blue flowers start opening in early July and continue into October.

One of the wood anemones that is particularly appealing is the one with lavender-blue flowers.

Some clematis, particularly the popular Mrs. Cholmondeley with lavender-blue flowers, and Dr. Ruppel with maroon flowers, do not need any pruning at all.

The small (.5 in) electric lavender-blue flowers grow in tight whorls and bloom profusely.

'Allenii' (AGM H4) - large lavender-blue flowers, often with seven petals (named after James Allen, nurseryman)

Small scabious, Scabiosa 'Butterfly Blue'; a long-flowering plant that produces lavender-blue flowers from late spring well into autumn.

Their spikes of white or lilac or lavender-blue flowers tend to lean in an ungainly way.