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composition of propolis varies considerably from region to region, along with the vegetation. in northern temperate climates, for example, bees collect resins from trees , such as poplars and conifers (the biological role of resin in trees is to seal wounds and defend against bacteria, fungi and insects
composition of propolis varies considerably from region to region, along with the vegetation. in northern temperate climates, for example, bees collect resins from trees , such as poplars and conifers (the biological role of resin in trees is to seal wounds and defend against bacteria, fungi and insects...
https://en.wikipedia.org/wiki/Propolis