You can expect the evergreen species to flower in early summer while deciduous species will flower later in the autumn.
Unlike many Ceanothus, C.americanus bears white flowers in the summer, you can expect it to grow between three and four feet.
In Britain, most species are hardy although they are more likely to perform better in the south of England.
Plant these in a lighter soil. It is best to plant them in the spring, they can be planted in autumn but will require protection from the frost during their first winter.