Rosenstone

The Rosenstone is a flower that blossoms shard like crystals. Minnow Evergold describes it as blue in appearance but the plant only lights up when you're closer to it, making it quite hard to find initially. It likes to grow in damp/moist areas and typically in ravines.
Minnow Evergold claims that they have hallucinogenic properties, is a component she uses to give her the "visions".