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Is It Safe to Plant a Garden in Galvanized Stock Tanks?

Is it safe to plant a garden in galvanized stock tanks?   

Zinc from new galvanized metal can sometimes leach into soils at levels high enough to inhibit good plant growth. An old metal stock tank would probably be fine, but a new one would not make a good planter unless you lined it with plastic.

— Garn Wallace, Soil Scientist, Wallace Laboratories