Once I was told that the work of God resided on each flower, on each petal and on each grain of pollen. Because for something this beautiful to exist, it could not possibly be the result of mere chance.
— Seravat the Prophet in The Book of Flames Chap. IV - The Flower's Soul
Alchemy is one of the secondary Attributes explained in the Unlikely Flowerings supplement. It is a measure of how proficient one is in the Emerald Arts.
It covers several aspects of item creation and enhancement. Items created with Alchemy can mimic in a way, several Miracles of several Attributes.