Starting a small (10-12 trees) new mixed orchard on site of an old ancient orchard which is resplendent in aggressive grasses. Would like to emphasize meadow/permaculture environment over monoculture grass underfoot. Have read about Yellow Rattle being helpful to keep grasses in check (being hemi-parasitic on grass roots) and support meadow plants from being overwhelmed by the grasses.  Anyone try this and have experience/words of wisdom with introducing Yellow Rattle to grassland environment in the Pacific NW?