ANSWERS: 2
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Any contaminant it wood will leach, though the amount will be small. Also once water has become 'laced' it will of course seek it's level which is down, not up. Your plants should be safe. As a precaution use ties that have already been weathered as opposed to freshly produced. When new such wood can contain thousands more PPM (Parts Per Million) of a given contaminant.
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We made our raised beds out of Trex. You can use a similar synthetic deck material though. They just require additional bracing as they are very flexible.
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