I notice that the willow herb is more abundant around me now than it was three weeks ago. But, on most of the other roads I drive along it seems to have peaked a couple of weeks ago. The Himalayan Balsam has intrigued me
http://www.habitas.org.uk/flora/species.asp?item=3189
Busybee, You say you are not aware of any great expanse of balsam in your area. As you are close to me then I assume the same is for me. I have no idea about what is on the rivers around me (I must walk them sometime). I am hoping that the bees might find the areas we don’t know about?