Updated: June 28, 2023

If you have a Thai basil plant that seems to be growing sideways instead of upright, you may be wondering what could be causing this peculiar growth pattern. Thai basil is a popular herb known for its distinctive flavor and aroma, and it is commonly used in Thai and Southeast Asian cuisines. While it is generally a relatively easy plant to grow, there are several factors that can contribute to its sideways growth. In this article, we will explore some of the common reasons why your Thai basil plant may be growing sideways and provide tips on how to fix the issue.

Insufficient Sunlight

One of the most common reasons why Thai basil plants grow sideways is due to insufficient sunlight. Like most plants, Thai basil requires a minimum of six hours of direct sunlight per day to thrive. If your plant is not receiving enough sunlight, it may start to lean towards the source of light, resulting in sideways growth.

To remedy this issue, ensure that your Thai basil plant is placed in a location where it can receive adequate sunlight. Ideally, choose a spot that gets at least six hours of direct sunlight each day. If you are growing your basil indoors, consider placing it near a sunny window or using artificial grow lights to supplement the light requirements.

Improper Watering

Another common culprit behind sideways growth in Thai basil plants is improper watering. Overwatering or underwatering your plant can lead to weak and floppy stems, causing the plant to lean or bend sideways.

To strike the right balance, water your Thai basil plant when the top inch of soil feels dry to the touch. Avoid watering too frequently or allowing the plant to sit in soggy soil as this can lead to root rot. Additionally, ensure proper drainage by using well-draining soil and pots with drainage holes.

Lack of Support

If your Thai basil plant has been growing sideways for some time without any support, it may start to develop a habit of leaning in that direction. Lack of support can cause the stems to become weak and unable to hold the weight of the plant upright, resulting in sideways growth.

To rectify this issue, provide support for your Thai basil plant by using stakes or a trellis. Insert a stake near the base of the plant and gently tie the stems to it using soft plant ties or twine. This will help train the plant to grow upwards and prevent further sideways growth.

Pests and Diseases

Pests and diseases can also contribute to sideways growth in Thai basil plants. Common pests like aphids, spider mites, and thrips can weaken the stems and cause them to bend or lean sideways. Fungal infections such as Fusarium wilt can also lead to stunted growth and abnormal plant posture.

Inspect your Thai basil plant regularly for signs of pests or diseases. If you notice any infestations or symptoms, take immediate action to control the problem. Use organic pest control methods such as insecticidal soap or neem oil for pests, and consider removing infected plants to prevent the spread of diseases.

Nutrient Deficiencies

A lack of essential nutrients can also result in sideways growth in Thai basil plants. Nutrient deficiencies, particularly in macronutrients like nitrogen, phosphorus, and potassium, can cause weak and spindly stems, leading to sideways growth.

To address nutrient deficiencies, ensure that your Thai basil plant is growing in well-amended soil or use a balanced organic fertilizer specifically formulated for herbs. Follow the recommended dosage instructions on the fertilizer package and avoid over-fertilizing, as this can also lead to adverse effects on the plant’s growth.

Conclusion

If your Thai basil plant is growing sideways instead of upright, it is essential to identify and address the underlying causes promptly. Insufficient sunlight, improper watering, lack of support, pests and diseases, as well as nutrient deficiencies can all contribute to this growth pattern. By providing adequate sunlight, proper watering, support, and addressing any pest or disease issues, you can help your Thai basil plant grow upright and healthy. Remember to regularly monitor and care for your plant to ensure its optimal growth and productivity. With a little attention and care, you can enjoy the delicious flavors of Thai basil straight from your own garden.