These spells are designed to be used when no other is available or desired. As with any part of magic they can be altered to suit your tastes and imagination. Most of them should be done outside, but with a little thought they can be performed inside as well.
Though they are related to the four elements, each spell can be used for any magical need, alone or in conjunction with other spells. [...] For example, if I wished to attract a love, I might wear a sachet and then throw herbs onto a roaring ocean, as in the Water Spell.
Feel free to make up your own spells when working with herbs; it's perfectiy alright and the spell can be tailor-made.
Place the appropriate enchanted herbs in a bag and take to a wild place. With your hands, dig a small hole in the Earth and pour the herbs into it. Visualize your need strongly. Cover the herbs over and leave the area. It is done.
Stand in an open place atop a hill or mountain, far from tall trees, buildings, and other hills. Hold the appropriate enchanted herbs in your power hand and, facing North, blow a little of them to that direction. Turn East and repeat the spell, then do so to the South. At the West blow all the herbs far from your hand. Visualize your need strongly all the while, stating it in words if you wish.
W rite or make a symbol of your need on a piece of paper cut into a triangle. While visualizing your need, place the appropriate enchanted herbs in the center of the paper and crumble it tightly so that the herbs are trapped inside the paper.
Anoint with oils if you wish.
Build a roaring fire in an outside pit or indoor fireplace. Throw the herb packet into the fire. As it touches the flames firmly visualize your need. Continue to do so until the packet has been consumed by the flames.
Take the appropriate enchanted herbs to a river, spring, lake, or seashore. Hold them tightly in your power hand and visualize your need. With a sweeping motion, scatter the herbs onto the water. The power has been sent.
(from Cunningham’s Encyclopedia of Magical Herbs by Scott Cunningham)