What is this tree?
It looks a bit like a lavender but it doesn't really have a scent (and it's a tree!).
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It appears to be a Ceanothus - as to which variety, I can't tell from the photograph (because I can't see the leaves properly), except to say its one of the larger varieties - Ceanothus vary in height from around 5 feet up to around 20 feet, some are evergreen some are not, other varieties have larger, looser and paler blue flowers later in the year. If you'd like to add a close up photograph showing both a flower in detail and the leaves, it should be possible to refine the ID.