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How To Dry Fresh Herbs Using a Dehydrator. 1  Preheat your dehydrator with the thermostat set between 95 and 115 degrees Fahrenheit. 2  If your herbs are damp, be sure to gently blot them dry with a towel to remove as much moisture as you can. 3  Place the herbs on the dehydrator trays in a single layer.
Loose, fine herbs like yarrow and mint will dry more quickly than moisture-filled herbs like plantain or comfrey. Expect 1-4 hours for most herbs. Check your herbs periodically for dryness. If you are using a stacked dehydrator, place the harder-to-dry herbs on the bottom and the lighter herbs on the top.