As we head into winter, you might be ready to throw in the towel on your lawn - but if your grass is looking a bit yellow, there's something you can do to bring it back to life. Late autumn's freezing temperatures and frosty conditions have led many of us to abandon our gardens as plants die back and prepare for spring. However, if your grass is looking yellow and sparse, don't despair - an expert has revealed a simple trick to get it looking lush again: lawn sand. A gardening guru on YouTube