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Not OP, but ag land can be under €10,000 an acre (well under in some places) which puts it in the "pricey but not unobtainable for the serious tree-planting enthusiast" category.

The elites don't want you to know this, but you can put seeds anywhere you like

Putting a seed somewhere has a pretty low chance of producing a tree some years on. Conditions need to be good enough, and there's fierce competition in the plant world, as well as animals and lawn mowers that curb growth.

Which is why I asked, what OP actually did.

I know folks who have planted trees on public land and on land owned by corporations, which seems cool but also kinda stressful.

I have a garden where i spend an hour or two watering plants and feeding birds. thats one hour away from screens.

You'd have a job on planting one tree a month in an average garden