How to Trim Potted Tree Roots

Once a potted tree reaches the desired size for its pot or environment, you want to keep it that way. Periodic root pruning is a pruning method that slows tree growth. How often you prune the roots depends on the type of tree. Start pruning the roots when the tree grows to the height you want it to remain or when it grows too big for its pot. Some trees need root pruning once a year, while others may never require it.

Tarp
Pruning shears
Potting soil

Instructions

- 1
  Look for signs that your tree needs root pruning. When roots start growing on the surface of the soil, over the side of the pot or out the bottom drain holes, you know the tree is starting to outgrow the container.
- 2
  Put plastic down or move the potted tree outdoors. Root pruning is a messy process.
- 3
  Turn the pot on its side. Support the tree trunk as you lay it down to avoid damage. Hold the base of the trunk in one hand and pull the container away with the other. An extra set of hands is useful for large potted trees.
- 4
  Brush off the potting soil from the outside of the root ball to expose the roots.
- 5
  Trim pack the root ball to one third of its total size. Use sharp pruning shears and make clean cuts. Cut away any rotten or damaged roots as you go.
- 6
  Empty the pot and wash it. Spread potting soil in the bottom of the pot. Pick up the tree by the root ball rather than the trunk to avoid damaging it. Stand it upright in the pot at the same depth as it was before. You may need to add potting soil under the roots to raise it up to its former position.
- 7
  Fill in around the root ball with additional potting soil and pat it down with the flat of your hand. Keep the potting soil level with the base of the trunk. Place the pot outside or in a sink and soak it thoroughly.

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