Take a little bit of speed and turn after you get back onto the softer snow. If you are on uneven terrain with one side being higher than the other, you can even out your line by shifting your route toward the lower bumps. Try to ride higher on the lower bumps, ride lower on the higher bumps. This will help even out your turns, and make your travel downhill as fluid as possible. I can't carve my turns in the bumps or on very steep terrain.
Nobody can carve on all terrain at all times.
You can try, but sometimes it is better to acknowledge that you are human. Try to use smooth skidded turns that you can control when the terrain does not allow you to carve. The content above are extracts from 'The Illustrated Guide to Snowboarding - Kevin Ryan'. An excellent overall guide to the sport whether you are a novice, or simply just need to polish up on a few aspects.