Acid Levels in Basil Plants

Identification

• Soils with a pH of seven or less are considered acidic. They may also be referred to as sour soils. A pH of seven is neutral, and pH levels higher than seven are considered alkaline.

Acid Levels for Basil

• Basil plants prefer acidic soils. Generally speaking, basil thrives in soil with pH levels between 5.5 and 6.5. However, as with all plants, recommended soil pH often varies by location. In Arizona, for example, basil may tolerate slightly alkaline soils, although these are certainly not ideal conditions.

Improving Soil

• According to Clemson University Cooperative Extension, the best way to amend soil for basil is to incorporate dolomitic limestone into the soil.

Best Practices

• In addition to proper pH levels, be sure to provide well-drained soil in full sun. Keep soil moist but do not over-water. Allow 12 inches of space between plants for maximum growth, and prune regularly once plants are established.