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wrote:

Hi, I am getting a nice planter structure build of fir wood. Not sure
what kind of fir.

I am not sure if I will put on concrete or the lawn yet, but I would
like to add something to protect the wood from weather and watering.
But the protectant should not contaminate the soil that is below it or
the plants in the planter.

Any suggestion? I heard linseed oil would be good? Where do you get
it?

Linseed oil would be a bare minimal protective coating for earth contact
and would do virtually nothing after a year or less. Unless you really
want the raw wood appearance, I'd suggest painting as the best
weather-resistant coating.

Failing that, I'd suggest painting the interior and using a good-quality
UV-inhibitor exterior varnish on the exterior.

Any common finish you use that dries will be ok wrt to the
plants/ground.