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How to prune an avocado tree in a pot
Disinfect your tools.
Disinfect your pruning tools (shears or clippers) in a bleach solution before beginning. A one part bleach, nine parts water solution works well.
Let your tools soak in the solution for 30 minutes. Since you'll be cutting into the flesh of your tree, you want to make sure your tools are free of bacteria, pests, and toxins.