I agree...plant them away from the creek bank. The feeder roots will seek and spread to a shallow level and find that ground moisture. Any closer will run the risk of flood wash and all your efforts will end up on CNN with some stupid kid holding on for dear life to your plants. I personally would want the youth to die instead of ruinning a good grow!

The soil around the creek bank will be holding enough moisture to maintain your grow. But yet nutes will be needed...and you must also consider the soil type your planting in!