What is friar laurence's special skill or area of knowledge?

Friar Laurence's special skill is in making medicines and potions from herbs.

In Romeo and Juliet, Friar Laurence is depicted as a well-liked and respectable monk that often give Romeo Life advice.
His skill is first revealed in  Act 2, Scene 3 when he is mixing various types of weeds and flowers to make a potion.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.