By Mary H. Dyer, Master Naturalist and Master Gardener Versatile and easy to grow, basil is an attractive culinary herb valued for its aromatic leaves, which are used either dry or fresh. Although basil is usually grown as an annual, it is suitable for growing year round in USDA plant hardiness zones 10 and above. Although the herb is relatively trouble-free, it is susceptible to certain pests and diseases that can cause yellowish leaves on basil plants. What Causes Basil Leaves to Turn Yellow? There are a number of reasons for a basil plant turning yellow, and determining the reason isn’t always easy. Improper watering – Root rot, a result of too much water, is one of the most common reasons for yellow leaves on basil plants. Water basil only when the top 1 to 2 inches of soil is dry, and remember that slightly dry soil is healthier than
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