Renovation alone will not be sufficient if problems are too severe. Starting a new lawn may be the best option where removal of the existing turf, tilling, adding topsoil, and changing the soil grade are needed. The following conditions may warrant starting over:
* an excessively compacted soil
* greater than 50% weeds or bare soil
Renovation should be considered if any of the following conditions exist in your lawn:
* Approximately 20-40% of the lawn is dead or has very sparse growth. This may be due to a variety of factors such as low soil fertility, drought and heat, insect damage, poor mowing practices, disease, moderate soil compaction, or increasing shade and competition from growing trees.
* The lawn is soft and spongy when walking across it and responds poorly to regular watering and fertilizer applications. This condition usually indicates excessive thatch (greater than ½ inch). Thatch is a layer of partially decomposed grass stems, roots, and rhizomes (not leaves) at the soil surface but below the green vegetation.
* Broad-leaved weeds such as dandelion, plantain, and knotweed, or grassy weeds such as crabgrass cover about 20-40% of the lawn area.