In the interest of reducing the amount of redundancy on this site I am giving you a link to another site that has a good page on the elements: The Elements .
When you are considering ingredients to add to your rituals and spells, it's important to use things by their appropriate planetary ruler and their elementary ruler.
I would recommend The Complete Book of Incense Oils, and Brews by Scott Cunningham, (Llewellyn Press). You will find this book to be indispensable.
Earth: Recipes to for peace, fertility, money, business success, stability, growth (as in gardens), employment, and so on.
Bistort, Cypress, Fern, Honeysuckle, Horehound, Magnolia, Mugwort, Narcissus, Oak moss, Patchouli, Primrose, Rhubarb, Vervain, Vetivert.
Acacia, Arabic Gum, Almond, Anise, Benzoin, Bergamot Mint, Citron, Lavender, Lemongrass, Lemon Verbena, Mace, Marjoram, Mastic Gum, Parsley, Peppermint, Sage, Star Anise.
Fire: Recipes to promote, communication, defensive magic, physical strength, magical power, courage, will power, purification.
Allspice, Angelica, Asafetida, Basil, Bay, Carnation, Cedarwood, Cinnamon, Clove, Copal, Coriander, Deerstongue, Dill, Dragon's Blood, Fennel, Frankincense, Galangal, Garlic, Grains of Paradise, Heliotrope, Juniper, Lime, Marigold, Nutmeg, Orange, Peppermint, Rosemary, Rose Geranium, Sassafras, Tangerine, Tobacco, Woodruff.
Water: Recipes to promote love, healing, peace, compassion, reconciliation, purification, friendship, de-stressing, sleep, dreams, and psychism.
Apple Blossom, Balm Lemon, Calamus, Chamomile, Camphor, Cardamom, Catnip, Cherry, Coconut, Comfrey, Elder, Eucalyptus, Gardenia, Heather, Hyacinth, Iris, Jasmine, Lemon, Licorice, Lilac, Lily, Lotus, Myrrh, Orchid, Orris, Passion Flower, Peach, Plumeria, Rose, Sandalwood, Spearmint, Sweet Pea, Tansy, Thyme, Tonka Vanilla, Violet, Ylang-Ylang.