This is floss flower, Ageratum houstonianum 'Leilani Blue'. Picture taken September 24, 2009. Be careful, there is another plant at Purdue Memorial Gardens that looks much like this and has a similar looking but different name, that is the Hardy Ageratum (Blue mistflower). This is confusing! Considering the potential for Ageratum houstonianum for invasiveness, it would make sense to be sure to only plant our native blue mistflower.
Link to previous post on blue mistflower (Conoclinium coelestinum):
Link to Ageratum houstonianum:
Link to Ageratum houstonianum:
Link to Ageratum houstonianum:
Link to Ageratum houstonianum:
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