Grimy buckthorn

Grimy buckthorn is the highest Tier 3 grimy herb found while training Dungeoneering in Daemonheim's dungeons. It can be obtained as either a monster drop or from planting a buckthorn seed, which requires level 95 Farming. Cleaning it requires level 74 Herblore, producing a clean buckthorn and granting 13.4 Herblore experience.

Trivia

 * Buckthorns are a genus of about 100 species of shrubs or small trees from 1–10 m tall (rarely to 15 m), in the buckthorn family Rhamnaceae.