Hibiscus syriacus Oiseau Bleu AGM, 3LA bushy shrub with prettily lobed leaves, Hibiscus syriacus Oiseau Bleu has the most wonderful deep blue purple petals, unfurling to reveal deep cherry markings and a white eye. Because it is late flowering, it creates a wonderful display when other plants are starting to fade. A recipient of the RHS AGM (Award of Garden Merit), for all round excellence in the garden.