I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Ties and timbers are not toxic to plants. There is debate as to whether vegetables take up much if any of their chemicals. Check with your local Home Depot for availability of cedar and plastic wood products. I would consider cinder blocks. They can be stained to look quite natural in color.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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