raspberries please invade

These are my best cash crop that require the least maintenance. Observing this plant for over 10 years Ive learned that that the patches last not much longer than 12 years and seem collapse when exhausting the nutrients they require. Also I noticed that transplanting the suckers soon establishes a new colony when placed in the right location. My best berries seem to like north facing slopes , shaded from the east, which shows me that they prefer cooler condition that holds morning moisture.