As I have suggested before, an LA can have plants grown on a part of a site to be planted out as buildings are ready to be beautified. That means the young plants get used to the soil as they grow and do better than plants brought in though few really care about that when the plant merely provides a focus to empty their dogs. The dogs care even less. Seed is almost free and cable ties, stakes, etc. can be a lot cheaper than accountants for authorities allow. Existing trees can be coppiced for materials, even fencing to allow establishment of trees or nature areas. (Like a small heap of logs to encourage bugs that needs leaving alone for a year until a part of the scenery.) So budgets can benefit by the pre-planning or at least spent on labour rather than go to growers/nurseries to too great an extent. The new environment also benefits from been pre-attuned to soils, etc. though of course it is de rigeur to use compost in with plants in the holes to soften the blow where there is a difference between nursery compost and whatever has been brought in to use as extra. One tip, spent mushroom compost is being used to cover large areas and can be fine for turfing over. This does need mixing with something better (technical term: “muck”) for other plants.