How To Speak Australian 2

Last night I learned that "root" means fornicate (i.e., screw, bang, shag, bonk, you get the idea). This was revealed to be by my boss' boss' boss at a team dinner. Needless to say, the wine did not make me turn red.

Guess no one sings "Take Me Out to the Ballgame" or wears Roots Canada sportswear. How do they refer to the portion of a plant that absorbs water and nutrients from the soil?!