Peter Edwards wrote:
>I do not understand how the propolis comes from the buds.  The poplar
>flowers in April, but the main collection time for propolis is the autumn.

Good point you make. The sticky substance is on the tree most of the time, I
would say, in the various parts. 

In San Diego, where I grew up, the source of most propolis is eucalyptus
trees. This exudes from cracks in the bark. It is reddish purple, very
sticky and stains badly. 

I always thought that poplar is the chief source of propolis around here
(upstate NY). It tends to be somewhat more brittle than the western type I
was used to, but it stains just as badly. 

pb

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