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A dense bush of a California lilac, it has masses of blue flowers in spring and early summer above the dark green foliage. Like its species parent, it's extremely reliable. A good alternative is 'Puget Blue', which is a magnificent dark blue. The impressus species isn't totally hardy, but given a sunny, sheltered position, it should thrive without any problems. It can be trained against a wall where it has been known to reach up to 4.5m. Avoid cold, exposed sites, and give a light prune after flowering.