there are many yarrow or ready-made purification kits , you know here it is not a question of the plants themselves but the time of cutting, the tool with which you cut, etc. hence such kits cost money but it is not a placebo

For cleansing curses and charms, I especially recommend white sage. You can burn it at home in the form of an incense, fumigating yourself and the space. Verbena and bay leaf are other good choices, and you can add them to your bath or carry them with you in a pouch.

@Czulu if you want to protect yourself for the future, make yourself a protective amulet. Mugwort and wormwood are herbs with strong protective properties that ward off negative energies. You can wear them in a pouch or as jewelry.

And can stones also protect against curses? I've heard of black tourmaline, but I don't know how to use it.