Once you test your soil for pH, you will know whether or not you need to adjust the pH level for the specific crop you will grow. Garden lime consists of finely ground limestone and is applied to the ...

and adding too many grounds will affect the soil's pH. Tomato plants can tolerate slightly acid soils, as low as pH 5.5. But are the healthiest and most productive when the soil pH is 6.0 to 6.8 ...