You cause a Small white flower to grow in an unoccupied space you can see within range. The flower has an AC of 15, 3 hit points, and vulnerability to fire damage. During the duration of the spell, you can use a bonus action to command it to explode in a shower of ice. Alternatively, the flower will explode if it is reduced to 0 hit points. When the flower explodes, each creature within 30 feet of it must make a Dexterity saving throw. On a failed save, a creature takes 8d8 cold damage, or half as much on a successful one. The flower withers and dies if it does not explode within 24 hours.