Some of the common problems with basil plants include the yellowing of leaves, infestations by pests such as aphids and fungal infections due to the excess moisture. These issues are normally caused by excess watering, lack of drainage or congestion. To avoid them the basil should be planted in well-drained soil, spacing of the plants, and adequate air circulation. Frequently examine the leaves and eliminate the affected areas. There are natural pesticides such as neem oil or soft soap sprays, which are safe and effective in controlling pests.
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