Our expert says:
Plastic plant pots from the nursery are fine, but personally I would go for unglazed clay or terracotta pots. Food-grade/food-safe plastic containers are also fine, as are untreated wood planters.
If your containers aren't new (whatever they're made of) then you should know where they came from and what they were used for before. You don't want to use containers that might have previously contained something toxic.
If you have a nice container you want to use but aren't sure if its material is food-safe, rather use it for non-edible plants. Or, plant your vegetables in a safe pot which you place inside the other container using that as an outer shell that doesn't come into contact with the soil.
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