Arnica is masculine in nature and associated with Midsummer, the harvest and harvest spirits. It is sacred to Freya, Ra and Apollo. It is aligned with the sun and the element of fire.
To drive away thunderstorms burn arnica and say "Set arnica alight, set arnica alight, thunderstorm take flight."
Arnica can be used in general protective rituals as well as rituals for fertility of crops.
Arnica can be planted around an area to keep a spirit from entering or leaving. It will only work until the plant dies back in the fall.
*Packaged in a 4"X6" ziploc bag.