[alloysteel]

If the restoration of a meadow is the objective, the soil must be seeded with the desired vegetation, and some aggressive management treatment carried out for several years after, such as mowing or even highly selective herbicides, both anathema to the tree-hugger types. Once the low meadow is established, and a grazing population is using it regularly, the meadow maintains for a much longer time.

[Carry_Okie]

soil must be seeded with the desired vegetation

Some species are rare and local. Propagation can be tricky and their ability to resist introduced cultivars is poor(particularly against varieties selected for forage). Some introduced species have pre-emergent properties. It isn't easy. Some interesting work is being done in the sheep industry, teaching the sheep to graze specific species.