Horse Grass

Horse Grass is a plant from The Legend of Zelda: Twilight Princess. It is a small reed bearing a similar shape to a horseshoe. Link can use Horse Grass to whistle Epona's Song, which summons Epona, similar to how Hawk Grass is used to summon a hawk. As a wolf, Link can howl the tune while standing next to Horse Grass. It grows mainly near the Spirits of Light's springs, but can also be found at Ordon Ranch and in parts of Hyrule Field.

Later, Ilia gives Link a charm named the Horse Call, which functions the same as the Horse Grass. Because of this, Horse Grass becomes obsolete once Link obtains it.