It was a last minute decision and really no choice. The bed is a disaster of grass, weeds, etc. It was far simpler to bite the bullet and dig the entire bed, and incidentally meld the two beds than to try to dig grass clump by grass clump, especially considering that the weeds had infiltrated the grounds covers. I will knock the dirt out of clumps, pulling weed and grass roots before replanting. Then catch any strays that try to grow one by one. Or so that is the hope.