(D =leaf losing and E = )
The hardier ceanothus can be grown in the open. They are more often trained against walls and are not much tied in but are allowed to make loose growth.
Ceanothus burkwoodii (E), rich blue flowers in summer and autumn.
C. Delight (E), one of the hardiest kinds, rich blue flowers in spring.
C. dentatus (E), bright blue flowers in spring.
C. Gloire de Versailles (D), powder-blue flowers in summer and autumn.
C. Indigo (D), a dark blue summer-flowering kind.
C. Perle Rose (D), rosy-carmine flowers in summer.
C. rigidus (E), purplish-blue flowers in spring.
C. thyrsiflorus (E), hardier than most, with bright blue flowers in summer.
C. veitchianus (E), another hardier kind, with flowers of a deep, rich blue.