Soil pH in Warren, OH: Lime or Sulfur?

Typical topsoil pH in Warren, OH

Typical topsoil in Warren, OH is pH 6.17, already right for vegetable garden (6-7). Test before adding anything.

What Warren needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, strawberries, roses, pink hydrangeas.
• Just outside, test first: tomatoes (off by 0), potatoes (off by 0.2), azaleas and rhododendrons (off by 0.2).
• Sulfur: blueberries 2.8 lb/100 sq ft over 2 applications; blue hydrangeas 2.1 lb/100 sq ft over 2 applications.

What to do next

If your test lands near 6.17, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, tomatoes, potatoes, strawberries, roses, azaleas and rhododendrons, pink hydrangeas.

How mixed the soil is

Of the 228,668 surveyed acres in Warren, OH, 42% are near neutral (6.5-7.3), 41% are moderately acidic (5.5-6.5), 14% are strongly acidic (below 5.5), 3% are alkaline (above 7.3). Mapped soils run from pH 4.6 to 7.9, a spread of 3.3 units across 524 soil components. No single class covers 60% of the county, so two gardens a few miles apart here can need opposite treatments. Test your own bed.

Clay, organic matter and rates

Topsoil here averages 19.8% clay and 2.08% organic matter, which this site treats as loam. Moving it one pH unit takes about 7 lb of lime or 2.3 lb of sulfur per 100 sq ft. 7% of mapped components carry free carbonate (lime already in the ground).

Warren against the rest of Ohio

pH 6.17 is 0.09 above the Ohio median of 6.08. 46 of 88 Ohio counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Fairfield (6.08), Wayne (6.08), Highland (6.09), Huron (6.17), Morrow (6.2), Erie (6.24), Clinton (6.25), Hamilton (6.25).

The range in Ohio runs from Monroe at 5.02 to Wood at 6.6; Warren sits 73% of the way up.