Establishing Grass Over Ground Tree Stumps

After losing 40 white pines to storms, a Kentucky homeowner ground stumps a few inches below grade and wanted to seed grass without removing the massive amount of wood chips. The concern: decomposing wood ties up nitrogen and lowers pH.

Recommended Approach

1. Sow annual ryegrass immediately—it's inexpensive, germinates in days, and can be reseeded as needed.
2. Apply light, frequent nitrogen: use a nitrate-based fertilizer (e.g., calcium nitrate) at half the label rate every two weeks around stump areas. This provides immediately available nitrogen without further acidifying soil.
3. Monitor pH monthly; maintain 6.0–6.5 with lime as needed.
4. Transition to permanent grass once ryegrass establishes and soil conditions stabilize (usually after one full growing season).

Why Not Fresh Manure?

Fresh horse manure has a high carbon-to-nitrogen ratio; microbes will consume soil nitrogen to break it down, worsening the deficit. Composted manure has little nitrogen left and won't help.

Long-Term Outlook

Stump decomposition takes 3–5 years. Annual ryegrass and light nitrogen applications bridge the gap until the wood breaks down and the soil ecosystem rebalances.