How to Test Soil pH at Home: DIY vs Lab Tests

How to test soil pH at home — when a cheap meter is enough, when to spend the money on a lab test, what the numbers mean, and how to use results to fix real garden problems.

When to do this

Test soil pH before establishing a new planting bed or before planting a crop with specific pH requirements (blueberries at 4.5–5.5, azaleas at 4.5–6.0, potatoes at 4.8–5.5, versus asparagus preferring 6.5–7.5). Re-test after applying any pH amendment — lime or sulfur — at 3-month intervals to track progress. Per Penn State Extension, "re-testing after amendment application is essential because pH change is slow and gradual." Per Cornell Cooperative Extension, established garden beds benefit from testing every 3–5 years even without visible problems.