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I'm very interested in "seed bombs". We have to plant something like one trillion trees just to keep up with losses from forest fires. Imagine the economics, supply chain, science, innovation, etc required to plant one trillion trees and all their supporting shrubs and ground cover. My impression is they work well enough for flowers. I have no idea about shrubs or ground cover. I'm aware there's some efforts to seed…
Probably the toughest part of "reforestation" like that isn't the "planting of trees" process, but you have to actively monitor them and make sure they actually work out and survive. A bit amount of these enormous "plant trees over large areas" efforts fail simply because they didn't even come back once to actually maintain the plants until they're strong enough to actually form a ecosystem. So sure, just planting on…
If you've ever seen an unkempt lawn in a northern-US environment, the grass grows out of control then some wildflowers come in, then some taller shrubs, and soon tree saplings pop up and it quickly gets to the point where it can't be easily mowed anymore with a residential lawn mower.
[1] https://www.sugiproject.com/blog/miyawaki-method-for-creatin...