How to do Top dressing for Lawn this Winter in Randburg. How to top dress your lawn using 70 30 Sand Soil Mix The Relentless Gardener Beware! Top Dressing Incorrectly Can KILL Your Lawn! Winter is "NOT" the time to top dress lawn in Cape Town. Top dressing has benefits such as helping nutrient retention, helping level uneven Lawn looking thin, patchy, or uneven after winter? Top dressing with overseeding is one of the best ways to bring it back. We've been doing this for this property for a few Top Dressing Lawn Plant for Success