Acacia Dealbata Plant. Very surprised this is rated as a zone 10 plants, there's no way this is the case, there is mature acacia dealbata on my peninsula, and a fairly large one in the areas botanic garden. It is hardy to uk zone 8.
The rhs award of garden merit (agm) helps gardeners choose the best plants for their garden. It flowers without fail every spring and produces a great display. Requires full sun and reasonably well drained (but not chalky) soil.