Flower of Frost

The Flower of Frost is a Hardmode Magic weapon dropped from a Mimic in the Underground Snow biome. Functionally similar, though superior, to the Flower of Fire. It shoots a slow, non-piercing ball of frost that bounces up to seven times (dissipating on the eighth). Its projectile is much less affected by gravity than the Flower of Fire, cannot bounce on platforms, and functions in all liquids. It has a 50% chance to cause the Frostburn debuff.

Trivia
It may be a reference to New Super Mario Bros' Ice Flower in the way it acts, and in the game, you pick up a blue flower to get the effect.