Railroad Ties In Gardening

Q: I don’t see railroad cross ties being used much these days in landscaping.
Have they simply fallen out of favor or perhaps are they deemed
environmentally harmful? 

A: I think they have fallen out of favor somewhat, probably due to the
poisonous creosote most railroad ties are treated with. There is a legitimate
concern about using them to line a vegetable bed. If used to make a retaining
wall, they eventually rot. There are better materials available for both jobs.

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