Old Rectangular metal tub has rusted. May be aluminum or tin?

Question

Can I use it for planting vegetables outdoors? Is it safe? Can I make it safe?

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Answer 1

It should be fine. Make sure your container has drainage holes. If not, drill plenty in. You can always line the cover with plastic before adding your soil. I did that with my wood planter. You need to punch holes in the plastic, too.