Mooncalf dung can only be harvested when the Mooncalf emerges from its burrow during the full moon. If collected before the sun rises, it will make any magical plant it is spread on grow fast and strong.
Taking mooncalf dung from a field owned by another wizard without permission is illegal, and reported cases of theft by Summoning Charm are prosecuted by either the Improper Use of Magic Office and/or the Wizengamot.
- Fantastic Beasts and Where to Find Them
- J. K. Rowling's Official Site (Mentioned only)
- Wonderbook: Book of Potions (Mentioned only)