I’ve been looking all over for what these flowers can be used for in witchcraft but can not find any information. Does anyone know any?
This is not a plant that would have appeared in the Materia Medica of Western tradition, and you’re not going to find much of it in Witchcraft lore, though any plant can be used by a creative witch. It may have had some use among the Indigenous people of South America.
It seems there is some tradition and research associated with the prevention and treatment of kidney stones. You can find it here https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6470270/
This is a baneful plant, toxic to humans and animals. Thus, you can use it in sympathetic spells for baneful purposes. A thorny bush, it might be appropriate for a hedge if you have a neighbor who likes to send icky energy over the fence at you, since the thorns, flowers, and fragrance will break up and neutralize any negative energy passing through it.