Answer: The basics are pretty simple. Gently mix together fully dried fragrant or colorful flower petals and/or fillers such as small pine cones or cedar chips or cinnamon bark, etc. to create volume and texture. Add a drop or two of your favorite essential oil(s). Some recipes also call for a small amount of fixative such as the powdered orris root to help the fragrance "stick". Store covered for several weeks or months, stirring or shaking occasionally, to allow the fragrances to meld. Then seal into packages and give as gifts, or set out in a small dish to scent a room, or use as desired. Keep remainder sealed to preserve fragrance. Refresh opened potpourri with additional oil as needed. Keep in mind that the oils can be overpowering if overused. The essential oils (sold in tiny vials) are available at many craft stores, often at herb shops and sometimes by mail order, and also where aromatherapy supplies are sold.
Here are a few examples of plant-specific recipes to give you an idea of the proportions that are typically suggested. You will need to cut and paste the urls into your browser to make them work correctly.
Enjoy your potpourri and congratulations on your lovely garden!
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