This section is from the book "The Complete Garden", by Albert D. Taylor. Also available from Amazon: The Complete Garden.
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
 
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