Poppy of Thorns

The Rose of Thorns is a plant from the Witchery mod. These are trapped roses, and look identical to normal roses. When an entity walks over this plant, the plant will turn into a four block high cactus, and the block below it will turn into sand. The plant is consumed whenever an entity walks over it. The Rose of Thorns can only be harvested by breaking the block it is on top of, which can only be dirt, grass, or sand.