Why Do My Tomato Plants Have Purple Leaves

Tomato plants are one of the most popular vegetable plants grown in many vegetable gardens. They are easy to care for and can provide a bountiful harvest of fresh and tasty tomatoes. However, if you notice purple leaves on your tomato plants, you might be wondering what is causing the issue.

Reasons for Purple Leaves on Tomato Plants

Several reasons can cause purple leaves on tomato plants. Some of the most common reasons are discussed below.

Phosphorus Deficiency

Phosphorus is an essential nutrient that plants need for growth and development. A deficiency in this nutrient can cause plants to have purple leaves. If you notice your tomato plants have purple leaves, it may be because there is a shortage of phosphorus in the soil. This can often happen when the soil is too acidic or too low in organic matter. Adding organic matter, such as compost or manure, to the soil can help improve phosphorus levels.

Temperature Stress

Another reason for purple leaves on tomato plants can be temperature stress. Tomato plants prefer warm temperatures between 70 and 85 degrees Fahrenheit. If the temperatures drop below 55 degrees Fahrenheit, the plants can suffer from stress, which can cause the leaves to turn purple. Additionally, if temperatures rise above 90 degrees Fahrenheit, this can also cause stress and purple leaves.

Overfertilization

Overfertilization can also cause purple leaves on tomato plants. Too much nitrogen in the soil can cause the plant's growth to become too vigorous, and this can result in purple leaves. Additionally, too much phosphorus or potassium can also cause purple leaves. It is important to follow the recommended fertilizer application rates and not to overfertilize.

Pest Infestations

Finally, pest infestations can also cause purple leaves on tomato plants. Common pests that can cause purple leaves include aphids, flea beetles, and spider mites. These pests suck the sap from the plant, causing it to become stressed and develop purple leaves. Keeping an eye on the plants and treating any infestation promptly can help prevent this issue.

Conclusion

If you notice purple leaves on your tomato plants, it is important to identify the root cause of the issue. Once you have identified the cause, you can take the necessary steps to correct the issue and prevent it from happening again in the future.