Guides

• Your county's soil pH vs your yard's: how far apart can they be? — In 39% of US counties no single pH band covers 60% of the land. What that means for trusting a county figure.
• Calcareous soil: why sulfur will not lower your pH — 527 US counties have topsoil with enough free lime that sulfur is a losing fight. How to tell, and what to grow instead.
• How much lime or sulfur? Rates by soil texture, and why clay needs more — The lime and sulfur rates every county page uses, by soil texture, and how many US counties fall in each texture class.
• Where in the US do blueberries grow without amending the soil? — Typical topsoil is already acidic enough for blueberries in 1,320 US counties. Which states lead, and what to do elsewhere.