How to Do Root-Over-Rock Bonsai

The root-over-rock technique is a distinctive technique designed to mirror trees that have established themselves between rocks and concrete. In the natural environment, these trees are usually seeded by birds and insects that drop the seeds in small crevices while in flight. As the nutrients within the confined areas are depleted, the roots reach over the rocks to establish in nearby, nutrient-rich soil and the rocks become enclosed in the root system. The roots of the root-over-rock bonsai infuse themselves to the rock, just as in nature. Once the rock is placed, bonsai takes several months, if not years, to complete the establishment, depending on its individual vigor.

Instructions

- 1
  Plant or purchase a tree in a deep container. Let the plant grow freely in the container for at least a year. Allow the tree to develop a long, extensive root system that can be easily trimmed and wrapped around the chosen rock.
- 2
  Find a rock for your bonsai that meets your bonsai's shape and size requirements. Clean the rock with warm soap and water to remove foreign particles and potential infectious spores that may be attached. Allow the rock to day completely at room temperature so it does not shock the tree's root system.
- 3
  Remove your tree from its container and gently remove all of the soil from the root system. Untangle the roots gently and inspect the root system. Use sharp, sterile pruning shears to completely remove any dead or dying roots. Cut away the thin, small roots from the system.
- 4
  Position the tree against the side of the rock, rather than placing it at the top of the rock. Align the roots against the rock so the roots run along the rock's natural water pattern. Secure the roots in place with plumbing thread tape, as explained by Bonsai for Beginners.
- 5
  Plant the prepared tree in a well-drained container. Line the bottom of the container about a third of the way with well-drained, loamy soil. Place the tree in the center of the container and fill the container the rest of the way with soil. Be sure all of the roots are covered to promote rapid root growth.
- 6
  Prune the developing bonsai's branches and stems to balance the top growth to the newly pruned root system. Trim back vigorously growing branches and stems. Remove dead and ailing branches and stems.
- 7
  Allow the bonsai to remain in its container for one growing season. Repot the bonsai during its following dormancy period. Choose a deep, well-drained potting container that is approximately half the length of the rock. Fill the container a third of the way with soil and set aside.
- 8
  Remove the bonsai gently from its current container. Brush the soil gently from the root and inspect the system. The roots around the rock should be thick, hard and infused against the rock. Place the bonsai in the center of the newly prepared container and fill the container the rest of the way with soil. Press the soil gently around the roots and rock to secure its upright position.

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