Blackberries are commonly used in a wide array of dishes from blackberry cobbler to blackberry dumplings, and are even eaten plain as a snack. If you're a fan of these dishes then having blackberry plants growing in your garden is a must. Producing small, shiny berries, blackberry bushes are easy to grow but can be expensive if purchased directly from a nursery. Rooting your own blackberry cuttings is a way to spread these hardy bushes around your garden, and save yourself some money.
Use a shovel or a garden trowel to remove the soil from around the base of the blackberry bush to expose the roots. Dig carefully as not to damage the fragile roots. This process should be completed in mid September to ensure you do not harm the blackberry bush.
Remove the cuttings from the blackberry plant with pruning shears. Look for roots that resemble the thickness of a pencil and that are from 3 to 6 inches in length. Snip the roots straight across at the top, and cut the other end of the roots diagonally.
Tie all the cuttings together with a piece of string to ensure proper binding. Make sure all diagonal ends point in the same direction.
Place moist sand in plastic storage bag. Ensure there is enough sand in the bag to completely surround the roots. The sand should be moist, but not soaked. Gently insert the roots into the bag of sand; make sure the roots are fully covered. Store bags of cuttings for two weeks in an area that will remain between 40 and 50 degrees Fahrenheit. At the end of the two weeks, the blackberry cuttings should be rooted and ready for transplanting.
Prepare a planting bed for the blackberry cuttings to grow. Turn the soil with a shovel and break apart clumps. Sprinkle the planting bed with compost to ensure proper nutrients are present.
Dig holes in a planting bed that has been prepared. The holes should be 3 to 6 inches in depth, and should be approximately 1 foot apart to allow for best growth.
Remove the cuttings from their bags and plant the sprouted end of the cutting into the holes that have been dug in the prepared planting bed. Fill around the cuttings with loose dirt. Water the cuttings until the soil around them is moist but not soaked. Complete this process after the danger of the last frost has passed in the spring to ensure the cuttings will take root and grow properly.