re: Anyone's parents/grandparents used to whitewash the trees?

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It's not trashy just old timey.

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It's still practiced in commercial agriculture, orchards, etc. My sister and brother and law worked in nurseries grafting and growing trees. They used lime and water. It's somehow beneficial to certain young trees, mainly fruit I believe. I understood it protects the bark from sun when young and leaves weren't thick and also inhibits certain parasites. I agree you could see it everywhere in the 60's but it's still done and has a purpose.