Raspberry plants are easy to care for, and don't need much attention, but with those simple cares you will improve the quality and quantity of their fruits.
Is an instructable for winter care, when all the leaves are fallen down, but before the start of the sprouts in the spring.
This is an instructable for organic care.
I think it is important to do those thinks also if you only have few plants.
Step 1: CUT THE OLD PLANTS
First cut away all the old plants (the ones that made the fruits the year before), from the very bottom.
You can recognize them because they are branched, they are dead and they will not make fruit again (raspberry are an annual plant). The new one are usually only made with one unique straight trunk.