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[nottke <nottke1@earthlink.net>]

Every couple years I put a ring of pine shavings/sawdust (from a cabinet
maker who works primarily in pine) around each blueberry bush.  About 2-3
inches thick and from up-against-the-canes out about 18 inches.  This seems
to suppress most grasses, maintain moisture in late summer, and feed the
bushes with whatever they like.  I do not know if it is acidic.  Takes a
couple years to decompose.  Since I started doing this 8 years ago, the
bushes require severe pruning twice a year to keep them under 7 1/2 feet in
height, and we get bumper crops of large berries.  The bushes are located
in full sun, flat ground on top of a broad clay ridge, no irrigation, 15
miles west of Winston-Salem, NC.
Our local Extension Agent suggested the pine sawdust regimen.