I use only fresh basil from my garden or store bought in the winter, oregano is grown in my garden about 3-4 plants, let them fully grow all summer, Italian has pink flower mine does , pull them out when fully grown the root and all wash all dirt and dust just spray with garden hose fully clean tie them at the roots allow water to dry off by hanging upsidedown ,get a paper grocery bag wrap around the plants and tie at the roots, twine ,rubberband ,whatever let it hang dry upsidedown over winter in garage, in the spring just squeeze the bag until you feel all the plants have dropped all dried up leaves and presto, dried oregano place in a container and use.
Phil