Does anyone have any information on fall sources of propolis in the Pacific
Northwest. In spring here, it is mostly poplar, but is this true for fall
as well?

I tried the archives on this but was unable to come up with anything. Also
tried "Plants for Beekeeping in Canada" by Jane Ramsay with no luck (only
covers honey and pollen).

Thanks in advance for any and all help

Bob Hack (Shuswap area in BC, Canada)