Just a thought:
Will the preservatives double the cost of the wood?
If so will they double the life?
Taking the possible contamination of the soil into account, and acknowledging the extra Faff i having to replace the wood, just go for plain wood - maybe line to stop it rotting quite so quickly.
Even once it starts to rot its still going to retain the beds for a while - unless they are very deep.
Will the preservatives double the cost of the wood?
If so will they double the life?
Taking the possible contamination of the soil into account, and acknowledging the extra Faff i having to replace the wood, just go for plain wood - maybe line to stop it rotting quite so quickly.
Even once it starts to rot its still going to retain the beds for a while - unless they are very deep.
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