What Makes Soil Alkaline? The pH levels indicate the measure of a soil's alkalinity. A pH scale goes from 0 to 14, with 7 being neutral. A low pH is 0 to 6 and would mean there is more acid in the soil. A high pH is 8 to 14 and would mean the soil has

Exceptions include blueberries (which like more acidic soil, with a pH of 5.0 to 6.0) and asparagus (which prefer more alkaline soil, with a pH above 7.0). When soil pH is outside this range, there is a higher chance of nutrient deficiencies in your plant

Soil pH is so essential to gardeners that botanists have developed an official scale (called the pH scale) to indicate where a particular soil falls on the range of acid to alkaline. The pH scale runs from 0 to 14, with 7 being neutral. The lower the pH,