I'm interested in the importance of japanese knotweed in Northern latitudes. I'm in the Toronto area at the moment, and I've been watching bees and paying attention to what flowers they seem to be favoring. Goldenrod has been very abundant this year, yet I haven't seen a ton of bees on it - or asters. The only thing I've consistently seen them on in force is japanese knotweed.
So I'm wondering about the importance of this invasive plant to the bee in areas where it grows abundantly. It is not usually listed in the top late-season plants for bees the way goldenrod and asters are, but in both Nova Scotia and Ontario, I have seen a tremendous amount of activity on the flowers this time of year.
How important is this plant to the bees? What is your sense of it? Do you see the bees favoring it in your area?