This is one of those perennial topics that can be a bit controversial.
Pressure treated wood is treated with an arsenic-like compound.
The questions to consider:
* How much leeches into the ground?
* How much makes its way into your veggies?
* How much longer does it last than regular lumber?
Some of my garden beds are pressure treated, some aren't. It came down to budget for me.
I suppose weed barrier could be used to try to keep some of the chemical seepage out of the soil. Some tests have been done (no, I don't have links), showing that the amount of hazardous chemical that leeches into the vegetables is very low, but I don't blame people for not wanting to take that risk.
Untreated lumber may need to be replaced as often as every 2-3 years.
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