There are a few different ways to dry plants and herbs. For large, stalky herbs like spearmint, I like to hang-dry them in small batches. It’s not always the most practical way for drying and storing herbs, but I love the way it looks.
Wash the stalks thoroughly and then wrap a few stalks into a bundle. Bind the stalks together as tightly as possible, as there will be shrinkage once the herbs begin to dry. Alternatively, you can braid the ends of the stems together. I like to air dry mine out in the sun after washing them to get rid of as much surface moisture as possible, and then I move them to a warm, dry, dark room to complete the drying process.
Drying time will vary depending on many different factors, such as air moisture, temperature, and the density of the plant you are drying. Most leafy herbs will become brittle once they are fully dried. Once you’re sure they’re completely dried, they are ready to store. Store in air-tight containers to protect the herbs from oxidization, dust, bugs, and other not-so-great things.