Answer: If the yellowing leaves are near the bottom of the plant, they're probably just old leaves that will soon fall off. If the yellowing leaves are on top of the plant, where the new growth is begin produced, I'd suspect your plant is being overwatered. Basil needs a quick-draining soil and infrequent watering. Wait until the top of the soil begins to dry, then immerse the pot in a bucket or tray of water to thoroughly wet the rootmass. Once your plant has been thoroughly watered, wait until the top of the soil begins to dry out before watering again. To keep your plant in full production, cut it back every few weeks to encourage tender new growth.
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