If you want to help reforestation, it's important to know about a process called ecological succession. This is how nature does it.
The plants most people think of as weeds are very important in this. Botanically, they're known as pioneer species. They're tough, tenacious, and will grow even in unforgiving places.
Pioneers lay the groundwork for larger plants to gradually take over, eventually making a comfortable environment for climax species, like forest trees.
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@InvaderXan Are you sure "pioneer" is a botanical way of considering plants? I would have thought of it as a proper ecological classification, also because it includes stuff like lichens, which are not just plants, or bacteria.
@arteteco
Some terms like these tend to be shared between several fields of science, in fairness. And yes, there are pioneer species covered by microbiology, mycology, and zoology. But the earliest pioneers tend to be photosynthetic, purely because of the scarcity of nutrients.
https://en.wikipedia.org/wiki/Pioneer_species