Pole plants are a useful tool everywhere on the mountain, but they really shine in off-piste skiing. When skiing off-piste terrain, a blocking pole plant is particularly helpful because they keep your upper body from accelerating downhill so you can dictate your turns on steep terrain.
Video: Skiing: Pole Plants
Blocking Pole Plant Technique
As you're skiing, take your downhill pole and plant it at about a 45-degree angle in relationship to your skis. You want to time the pole plant with the edge set of your skis. As you plant your pole and your edges are set, slowly push your hand down the hill and ski around the pole so that you're ready to plant your other hand timed with your other edge set on the next turn.
Remember: Safety is your responsibility. No internet article or video can replace proper instruction and experience—this article is intended solely as supplemental information. Be sure you're practiced in proper techniques and safety requirements before you engage in any outdoors activity.