• Gently rinse oregano in cool water, taking care not to remove the leaves from the stems.
• Pat the leaves dry with paper towels.

Air drying method

• Tie the ends of the oregano branches together with kitchen twine.
• Hang in a wel-lit sunny window.
• When the leaves start to get dry and brittle, about 3-4 days, remove the bunch and remove the leaves from the stems.

Oven method

• Remove leaves from stems. Discard stems.
• Place the leaves on a baking sheet in a single layer.
• Heat the oregano leaves in the oven at 180° F for two hours. Check them to see if they've dried out completely. If so, they're done. If they are not yet dry, continue warming in the oven and checking on them in 15-minute intervals. Watch them carefully during this time to make sure they don't burn.
• It can take as long as four hours for them to dry completely in the oven. 

Crush oregano leaves and store

• Crush oregano by placing leaves in a mortar and crushing with a pestle. You can also crumble with your hands until the leaves are crushed.
• Place dried oregano into an airtight container. Label and store in a cool dry dark place and use as needed.