Good vs Bad

"For humans, because pioneer species quickly occupy disrupted spaces they are sometimes treated as weeds or nuisance wildlife, such as the common dandelion or stinging nettle.[3][2] Even though humans have mixed relationships with these plants, these species tend to help improve the ecosystem because they can break up compacted soils and accumulate nutrients that help with a transition back to a more mature ecosystem.[4][5][2] In human managed ecological restoration or agroforestry, trees and herbaceous pioneers can be used to restore soil qualities and provide shelter for slower growing or more demanding plants.[5][6][7] Some systems use introduced species to restore the ecosystem,[2] or for environmental remediation.[8] The durability of pioneer species can also make them potential invasive species.[9] [2][10]" - Wikipedia: Pioneer Species