The group of plants producing blue flowers is extremely limited. A few plants which are shown in this list are extremely interesting for their flowering effect and with the exception of the rose of Sharon and the lilac, many of them are seldom used.

Amorpha fruticosa False Indigo

Buddleia veitchiana Summer Lilac

Caryopteris incana Blue Spirea

Elsholtzia stauntoni Elsholtzia

Hibiscus syriacus ardens Blue Rose of Sharon

Paulownia tomentosa Empress Tree

Syringa vulgaris, President Grevy Double Blue Lilac

Vitex agnus-castus Chaste Tree