August is a good time to prune summer bearing raspberries. It's easy to do! Simply cut down the canes that produced fruit in June and July and leave the new canes as they will produce fruit next summer. The older canes will have the remains of the fruits stalks and they are also brown in color. Cut the old canes as close to the soil level as possible. Then select the best canes to train and tidy up, tying up to supports for best production next summer. As an alternative, you can cut all everbearing canes to the ground yearly in fall after fruiting has finished, but you will sacrifice one of the annual crops, but get an extended harvest from late summer to fall. After pruning and tiding up the canes, fertilize with a phosphorous
plant food and mulch with compost.