Why we need Mason Bees!?! To answer this question start by viewing Growing a Greener World episode #503.
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In a side by side comparison, mason bees pollinated almost 100 flowers to the one flower of a honey bee. Why? The honey bee is EXTREMELY efficient with how they gather their pollen. Little falls off. The mason bee is far less. Pollen falls off everywhere. ...and as a result, they pollinate more flowers!