Ageratum houstonianum ''Blue Horizon''

This is a beautiful short-lived perennial that is worth its weight in gold in the garden.  Beautiful lilac-blue fluffy flowers smother the plant from early summer right into late autumn.  Blue Horizon thrives in rich soil in partial shade, loving some protection from the afternoon hot summer sun.  A wonderful cut flower too.  Mine has been perennial for three years now!  75x60cm approximately.