Kentucky Bluegrass Soil pH Guide
Ideal pH range: 6.0-6.5. This is a narrower window than tall fescue (5.5-6.5). Below 5.8, nutrient uptake drops significantly — apply pelletized lime at 25-50 lbs per 1,000 sq ft. Above 7.0, iron becomes unavailable — apply pelletized sulfur at 5 lbs per 1,000 sq ft when air temps are below 75°F. Retest in 3 months. Iron supplementation (chelated liquid iron or ferrous sulfate) is popular for boosting KBG's blue-green color without adding nitrogen. Apply liquid iron at 2-4 oz per 1,000 sq ft every 2-4 weeks during active growth. Iron works best when soil pH is already in range — high pH locks out iron regardless of how much you apply.
Frequently Asked Questions
What pH does KBG need?
pH 6.0-6.5 is ideal. KBG is more pH-sensitive than fescue, so soil testing is especially important. At the right pH, KBG's signature blue-green color is most vibrant.
Can I use iron to darken KBG color?
Yes. Iron supplements give KBG a deep blue-green color without the growth surge of nitrogen. Liquid iron (ferrous sulfate or chelated iron) applied every 2-4 weeks is popular among KBG enthusiasts.
How does pH affect iron availability?
At pH above 7.0, soil iron becomes unavailable. KBG may show chlorosis (yellow blades) even with iron in the soil. Lower pH with sulfur or use chelated iron that stays available at higher pH.
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