Squill, also known as glory-of-the-snow, are a number of brightly coloured flowering plants in the family Asparagaceae. The species goes dormant after flowering in the spring. Squill bulbs, which have potion-making properties, are best harvested just after the plants flower.
Squill are used by Muggles to manufacture cough medicines, while wizards use it as an ingredient for Felix Felicis — renowned Potioneer Zygmunt Budge remarked that it was perhaps the squill that gave Felix Felicis its smooth texture.
- Wonderbook: Book of Potions (First appearance)