Fran Farmer wrote:

The one really wonderful thing about backberries (other than the
berries) is how wonderful the soil is under the canopy once a big old
long lived clump is finally killed off. All those years of dropped
leaves and bird poop creates wonderful soil.

Yes , it does make great soil . That part of last year's garden where I
removed berry bushes was the most productive . I expect this year to be good
too , most all of the garden is now on former blackberry areas .
--
Snag