This glyph when used on a block would grow any plant that is from the demon realm.

This, like all glyphs, has two ways to be summoned, but at the moment only one is added in the mod files, which is that when using the glyph on a block at the top a flower will appear.

It will come from the demon realm, and the second one to be added soon will serve as any bow, it will launch projectiles, or in this case thorns.