The only thing better than eating delicious, fresh blackberries is picking them from a thornless blackberry bush. Without the threat of being scratched in the process of collecting blackberries, you can enjoy harvesting as much as eating. While it could be costly to buy several thornless blackberry plants, you can always make your own transplants from an existing thornless variety for free. To transplant thornless blackberries is a simple process you can start in the fall and have transplants ready to be planted by the spring.
Look for new growth to begin in spring on your existing thornless blackberry and tie a twist tie, piece of string or a flexible plant tie loosely on a few new canes to mark them.
Wait until the early fall and gently bend the marked canes over so the tips touch the ground. Dig a small hole 6 inches deep and wide where the tip of each cane touched. Don't dig one hole for all the canes.
Bury the tips of the marked canes in the loose soil where you dug. Press the soil firmly on the tips to hold them in place, but be careful not to break the canes as you work with them and bend them.
Water the hole well and don't allow the soil to dry out for long periods of time. Feel the soil before watering to make sure the top inch is dry before adding more water.
Clip the bent canes in the spring halfway between the parent and the shoot, and dig up the buried tip. The tip should have a fair amount of roots attached to it. What was the "tip" of the parent plant is now the base of the transplant.
Dig a hole 1 foot deep and wide in the location of your choice, as long as it gets full sun and the soil drains well. Place the separated transplant in the center of the dug hole and pack the soil in well to hold it in place.
Trim the transplant so it only has two or three buds on the cane. Water well and keep it watered for the first month as the plant recovers from being moved. After new growth appears water only when needed based on the rainfall in your area.