Of course you can, but the real question is would you want to? Older treated
wood leached arsenic salts, sometimes in high concentrations. Many plants
can concentrate heavy metals (such as arsenic). Don't share your veggies
The arsenic and formaldehyde will be in the soil for decades. I would
plant something ornamental there for 4 or 5 years before I would chance
it. Of course you could get a soil test to actually know what is there.
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