Gardening Articles: Edibles :: Small Fruits & Berries by
National Gardening Association Editors With absolutely no
encouragement, red, yellow, and some purple raspberries will
produce new plants from root suckers. In the early spring, as
soon as the suckers emerge, dig up whole clumps of sucker roots
and soil. Separate the roots of the suckers from the mother
plant. Then transplant. Propagating Black Raspberries Blackcaps
and the remaining purples require a different procedure. Give
the plants a year or two to get established before prodding them
to multiply. In mid-summer, the current season's new canes (or
their lateral branches) will be ready for tip-layering: insert
the tips of some healthy and actively growing young canes
straight down about 4 inches deep into loose, moist soil.
Several shoots should emerge in the fall. Early next spring,
separate the new plant from its mother and transplant.