This plant loves death, it revels in the surrender of soul and lingers on the prelude to decay. A botanical psychopomp whose sole purpose is to guide and soothe a soul in this most important of transitions. So how is it useful to a witch? A couple ways, as it turns out.
Let's begin.
Encouraging a soul to leave a body.
Spirits, for varying reasons, usually having to do with revenge, love, or some combination of the two, often refuse to leave their corpse. This is understandable, you live there all your life, even uncomfortable bodies feel safer than no body at all to the newly deceased. The newly deceased who were emotionally vulnerable at their time of demise, are even less likely to leave their body. These souls linger, gradually retreating within as outer layers decay and disintegrate. Soon, only bones remain and the soul will nestle within this hard, skeletal home, a ghostly hermit crab of sorts. These souls are generally unhappy and they let it be known, causing mayhem and injury. While this may not be problematic for a body in a cemetery. A body left anywhere else is going to be an issue for the living. This includes cremains, which many people keep with them in the home, or even split up among relatives (a unique challenge in its own right, which can only be helped if the contents of all urns are reunited).
A NOTE: Spreading ashes can be extremely dangerous to the unwitting population of humans around where the ashes land. Important to keep in mind when considering this manner of death care. Unpopulated areas are best.