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The Californian Lilacs are amongst the most beautiful scented blue coloured shrubs .Many are evergreen in the warmer climates, dropping their leaves in the more temperate regions.
Ceanothus do best in sunny sheltered positions, in free draining neutral to acid soils. Amongst the most hardy are:
Ceanothus "Gloire de Versailles": Powder blue flowers in late summer/ fall. Rarely more than 7 ft tall.
Ceanothus thrysiflorus repens: Mid blue spring flowers. 3ft tall.
Ceanothus "Marie Simone": Pale pink flowers in late summer/ fall. 5ft tall.
Ceanothus "Autumnal Blue": Evergreen , dark blue flowers in late summer/fall. 6ft.
Ceanothus "Southmead": Royal blue flowers, May/June.evergreen 6ft.
All will grow taller if planted against a south facing wall.