Aaron said "Knapweed produces later in the
season in upstate NY, around the beginning of September (I don't think the
season in Nova Scotia is a full month behind upstate NY) and knapweed honey
is more medium-dark with no greenish hue."

Aaron, is your reference knapweed or knotweed?  I am reasonably sure
knapweed (a thistle-like noxious weed) starts producing around July 15 and
is a very light honey, similar to yellow-star thistle; to which it is
related.  Knotweed, I think, is a bamboo-like plant and seems to produce as
you stated.

Lloyd
Lloyd Spear, Owner, Ross Rounds, Inc.  The finest in comb honey production.
www.rossrounds.com