“cma country christmas” (9 p.m., abc): Jennifer Nettles of Sugarland returns to host

“cma country christmas” (9 p.m., abc): Jennifer Nettles of Sugarland returns to host “CMA Country Christmas,” a special featuring holiday tunes and memories of the season. Amy Grant, Martina McBride, Brad Paisley and Vince Gill are among the performers.

“weed wars” (10 p.m., discovery): Some critics believe that reality TV already has gone to pot. Now, get set for “Weed Wars,” a series that delves into the inner workings of a medical-cannabis dispensary in Oakland.

tv listings, B6