He does his best to minimize his look of fascination, but it doesn't do much to help. Sweeney takes the herb delicately, unable to look away from it as he moves to sit where directed. But then there's rosemary, too (which he has more experience growing). A quick peek up to confirm that Sam's inside, and he rubs a leaf of it between his thumb and forefinger without actually plucking it.

Sweeney lifts his hand to smell the oils. Real thing, almost certainly.

Why can't he just fucking graduate?