Rue, a hardy, evergreen, somewhat shrubby plant, is a native of Southern Europe. The greenish-yellow flowers are in terminal panicles, blossoming from June to September. One of the most striking features of this plant is indeed the strong, aromatic, bitter or acrid scent, but once you get used to it, it can be very soothing and comforting.
Spirits love fragrant smells, aromatic colognes, fine incense, and essential oils. They will not come unless your ritual space is clean and your body is clean. Always shower well before conjuring spirits and anoint yourself with the Santerismo oil of choice to call the specific spirit group you want to communicate with.
Basic offerings to give your spirits is light with candles, a glass of cold water, or a cup of black coffee. Do research on the spirits you are trying to conjure and learn about their culture so you know what they like. Purify and banish negative energy from your space, you do not need to sage, just use the LBRP. Then craft a ritual to call the well intentioned and good spirits of your group to give you guidance.