The Queen's Heart, also referred to as the Witch Queen Heart, is the Witch Queen's personal favorite flower which is located in her royal garden. It appeared in the first Movie where the ojamajos had to capture it before it could spread its seed in the Human World after Pop made a selfish wish upon it.
The Queen's Heart is a flower with 5 white heart-shaped petals and a small white stigma in the center, along with a little green stem, leaves and roots.
Every time a selfish wish is made upon the Queen's Heart, its petals will change color; turning into a pink color, and then to red, purple, and finally black.
The Queen's Heart is capable of granting any wish regardless of whether it's good or bad. It only takes one selfish wish for the plant to gain a mind of its own and flee off in search of more selfish wishes.