In this video, an expert gardener explains how to propagate raspberries and blackberries.To propagate, you normally need a small rooted cutting. The expert recommends that you soak the roots in water with a bit of root stimulator for about 15 minutes. Also, he says that the cutting should be planted in earth with compost and phosphorous fertilizer to help to roots grow better. When the earth is well mixed, you make a small hole, place the root in side and bury it, pressing the soil around the cane. Then you cut the cane smaller if it is too long and water it thoroughly.Once winter time is reached, dead canes should be cut out and longer canes shortened in order to grow better roots and fruit.