Spread the fresh petals on a mesh screen or on a large tray; place them in a warm, dry place, and stir or spread them around a little everyday until they are dry. Put dried petals in a large glass or metal bowl.
Add a fixative such as powdered orris root, oak moss, cellulose,ground gum benzoin or fiberfix. Use a ratio of two tablespoons of fixative to about four cups of dried material. Add the essential oils and mix with your hands.
Place the mixture in a paper bag and seal the top with clothespins or clips. Turn the bag over several times to distribute the fixative. Store it away from direct sunlight, and allow the mix to season for four to six weeks. Shake up the bag from time to time.
When the potpourri is "seasoned" place in open containers in warm places. Add a few drops of essential oils and mix with your hands from time to time as the fragrance diminishes.
The fixative is a vital element in a potpourri recipe. Some fixatives you could use are powdered orris root, oak moss, cellulose, ground gum benzoin or fiberfix . The fixative absorbs and retains the volatile scented essences. Essential oils or fragrance oils are used to reinforce the natural perfumes and to boost the scent. Without adequate fixative the life goes out of potpourri very quickly.
Include other petals of flowers like lavender, tulips, freesia and marigolds for added color and fragrance. Ingredients such as dried citrus peel , seeds, bark and tiny pinecones add variety to the texture and character of the potpourri. Small, whole dried flowers like baby rosebuds, and Santa Cruz oregano buds give depth and variety of size. Potpourri made only with petals tends to look like textured fabric. While there is nothing wrong with this, (rainbow like layers of different kinds of flowers can be very beautiful), combining petals with other floral material gives a more three-dimensional result.
Originally, potpourri was stored in closed ceramic jars which were opened when people used the room. The jars were placed near a heat source, so the perfume would expand in the warm air and fill the room with fragrance. When the people went out, the lids went back on. Nowadays, the beauty of potpourri is also considered to be part of its charm. Displayed in various ways, dried petals, whether scented or not, can be layered in glass containers, apothecary jars, placed in baskets, decoupage boxes, ceramic or silver dishes.
A little potpourri can go a long way if you layer it over a base of floral foam, moss or tissue paper. Store the bulk of your recipe in a closed container and sprinkle out a little at a time on a need to replenish basis. The fragrance lasts longer and the visual impact is the same.