I just moved to a house where there’s huge arborvieta trees about 30ft. High they have black berry bushes some with big stocks of 4in. Around. I have pulled out all the black berries and when doing so I found tons of beautiful natural mulch about deepFrom the years of trees and black berries not being cleaned underMy question is can I take it and spread it in flower beds, plant in it etc…Will it kill my flowers?