> As discussed before on list before, 
> Japanese knotweed rarely propagates
> from seed, hence honey bees don't 
> significantly aid in its spread. The main
> way that knotweed spreads is rhizomes.

I had to think back to my information source, as it contradicted the above
flatly - it was the official guide as published by the State of NY.

http://nyis.info/invasive_species/japanese-knotweed/

The page contradicts the statement made above thusly:

"Japanese knotweed spreads primarily by seed (transported by wind, water,
animals, humans, or as a soil contaminant), stem fragments, and by shoots
sprouting from its system of rhizomes."

So, if the plant spreads primarily by seed, then offering a good nectar
reward is an important strategy to help the plant survive in an area with
few pollinators.  A plant that would propagate primarily by rhizomes would
not tend to  provide rich nectar rewards.  Why bother?  Why waste resources?


But maybe the state of NY official page on the invasive plant is wrong or
poorly written.    It takes me some time to just ID any species that is
neither a rose nor an apple tree (which incidentally are closely related).



	

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