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How to prune oregano
Wait until your plant is at least 4 inches (10 cm) tall.
Trimming the plant too early could cause your plant to fail to thrive, so be patient. Luckily, oregano usually grows quickly.
Pruning your oregano will encourage new growth. Not only will it grow more leaves, it'll even grow more stems! Cut back no more than 1/3rd of the plant at a time.