Existing grass or other species must be removed, the soil may need substantial inputs of leaves or other organic material and newly established plants require weeding and perhaps watering until they are established.
(they; are established; ) (the soil; may need; substantial inputs of leaves or other organic material and newly established plants) Context(the soil may need,List([49, 66))):(Existing grass or other species; must be removed; )
the soil may need,List([49, 66))
they the soil Existing grass or other species
are established may need must be removed
substantial inputs of leaves or other organic material and newly established plants