There are several methods used for drying flowers. Those that require the use of desiccants such as borax or silica gel would not be appropriate for drying herbs which you intend to use as seasoning. There are also several ways to dry herbs, such as in a food dehydrator. Yet, a food dehydrator would be too harsh a method for drying flowers, which you would use in dry floral arrangements or craft projects. There is one drying method that would be appropriate for drying both flowers and herbs.
Harvest plants in the morning, after the dew has evaporated. Select attractive, healthy looking flowers that aren't wilted. Select herbs that haven't flowered.
Cut the flowers or herbs from the plant, leaving enough stem so they can be gathered into a bunch.
Gather together a bunch of flowers or herbs, similar in appearance to a small bouquet of flowers.
Tie a piece of twine or wrap a rubber band securely around the stems to secure the bunch.
Hang the bunch of flowers or herbs upside down in a dry, warm, well-ventilated area, out of the direct sunlight. This might be from a doorway, a curtain rod, or a hook secured in the ceiling. A second piece of twine can be used to suspend the bunch. Leave for two to three weeks, or until the bunch is dry.