How to renovate a lawn without tilling

Full lawn renovation -- killing the existing stand and replanting -- does not require tilling. Tilling creates more problems than it solves: it buries thatch, disrupts soil structure, creates a fine seedbed that erodes and crusts, and exposes dormant weed seeds throughout the turned soil profile..

Full lawn renovation — killing the existing stand and replanting — does not require tilling. Tilling creates more problems than it solves: it buries thatch, disrupts soil structure, creates a fine seedbed that erodes and crusts, and exposes dormant weed seeds throughout the turned soil profile. Per Penn State Center for Turfgrass Science, non-tillage renovation produces equivalent or better establishment results in most situations when done correctly.

When full renovation is needed

Per Penn State Extension, full renovation is appropriate when:

• Less than 50% of the lawn area is desirable turfgrass
• The existing grass species is not suited to the site
• Weed pressure is so high that overseeding into the existing stand won't succeed
• Significant soil problems (pH, fertility) need correction that can't be done through the existing turf

If desirable grass coverage is above 50%, aggressive overseeding is more appropriate than full renovation.