Collect mulch material as you perform lawn and garden care and home improvement tasks throughout the year. Instead of bagging and disposing of your lawn clippings, raked leaves, wood chips, or sawdust, hold onto them for the sake of your berry plantings.
Apply at least 4 inches of mulch material to the soil around your plantings. For raspberries, applying straw can require as much as 8 to 10 inches of cover.
Apply mulch material to the same depth between the rows of plantings.
Add more straw or grass mulch material after the first frost in fall or winter. By this time of year, the blackberry or raspberry canes will have fallen to the ground. Applying more mulch over the canes will help protect them until the spring.
Repeat steps 1 through 4 each year to protect plantings, retain moisture, and stave off weeds.