I grow eucalyptus and use it for rustic fencing. It is more durable than pine, for instance but it will decay in time. Whether or not you leave it in the grass, I would add a protectant to help it last longer. And at least the legs. I think to just raise them a touch from the contact with wet ground would be beneficial too. Like maybe rubber pads glued to the bottom of each leg.
That is a beautiful set.
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~Tina


Drama Free Zone.
What every gardener loves the most, Begins and ends in rich compost. (Tina)