Hibiscus syriacus is an excellent shrub for adding late summer colour to a border. It bears masses of flowers in shades of white, pink, blue and violet-blue.
This shrub has an upright, grow habit and needs an open, sunny position for producing plenty of flower buds.
Hibiscus syriacus ‘Oiseau Bleu’
Hibiscus syriacus ‘Oiseau Bleu’ is one of the best-known hibiscus varieties, and for good reason. It has fantastic, large, saucer-shaped blue flowers with a dark red centre, opening in late summer when few other shrubs flower. Leaves bright green.
Hibiscus syriacus ‘Woodbrigde’
Also popular is Hibiscus syriacus ‘Woodbrigde’ with striking, deep pink flowers to 8cm. Both shrubs will reach a height of 3m and a spread 2m.
Pruning Hibiscus syriacus ( Tree hollyhock).To make sure that the shrub flowers prolifically, cut back the previous year’s flowering stem lightly in March. If you want to retain the shape of the shrub, don’t prune it.
Hibiscus syriacus likes a humus-rich soil. Apply a 5cm layer of garden compost around the base of the plant in March.