Renovate the Lawn or Re-Sod It?

This is the biggest single decision on a struggling lawn, and there is a reasonably honest way to make it.

The coverage rule

Look at how much living, desirable grass is actually there. Not green — living turf of the species you want, as opposed to weeds and bare ground.

• Above about 60 percent: renovation is usually the better answer. There is enough plant material to spread and fill in, given the right conditions.
• Around 40 to 60 percent: it depends on why. If the cause is fixable and the remaining turf is healthy, renovation can work. If the cause is soil, shade or drainage, it will not.
• Below about 40 percent: re-sodding is generally the honest answer. Renovation at that level takes years and rarely arrives anywhere satisfying.

The question that actually matters

Why is the lawn in this state? Because whatever caused it will do the same thing to new sod.

• Shade. New sod under a dense canopy dies exactly as the old lawn did. Address the trees or accept a bed.
• Compaction. New sod over compacted fill thins in two years. Aerate first.
• Drainage. Turf will not survive standing water. Fix the grade or the drainage first.
• Untreated pests. Chinch bugs eat new sod as happily as old.
• Irrigation coverage. Dry spots stay dry under new sod.

Re-sodding without dealing with the cause is buying the same problem again at full price.

What renovation involves

1. Diagnose and fix the underlying cause — this is the whole job.
2. Kill and remove weed competition.
3. Core aerate, thoroughly.
4. Topdress to improve the soil profile.
5. Plug or patch the worst bare areas with matching sod.
6. Correct mowing height and irrigation.
7. Feed appropriately and give it a season.

It is slower than re-sodding and it costs less. It also only works when the cause has genuinely been dealt with.

When re-sodding is right

When coverage is too low to recover from, when the species is wrong for the site, or when the timeline matters — a property being sold does not have a season to wait.