If you’re a cannabis grower, seeing yellow leaves on your plants can be a cause for concern. Yellowing leaves can be an indication of various issues, including nutrient deficiencies, pests, and diseases.
In this article, we’ll explore the possible reasons why your weed plant leaves are turning yellow and what you can do to address the problem.
One of the most common reasons why cannabis leaves turn yellow is nutrient deficiencies. When plants don’t receive enough nutrients or don’t have access to them, they start to show signs of stress. Some of the most common nutrient deficiencies that cause yellowing leaves include:
Nitrogen is one of the most essential nutrients for plant growth, and it’s required in large amounts during the vegetative stage of cannabis plants. A lack of nitrogen can cause the lower leaves to turn yellow and die off, while the upper leaves remain green.
Magnesium is another vital nutrient that plays a crucial role in photosynthesis. A magnesium deficiency can cause yellowing between the veins on older leaves, which can eventually spread to the rest of the plant.
Iron is necessary for the production of chlorophyll, and a lack of it can cause yellowing between the veins on new growth. Iron deficiencies are more common in plants grown in alkaline soils.
Pests are another common cause of yellowing leaves in cannabis plants. Some pests that can cause this issue include:
Spider mites are tiny insects that feed on the sap of cannabis plants. They can cause yellowing and speckling on leaves, as well as webbing on the plant.
Aphids are small insects that suck on the sap of plants. They can cause yellowing and curling of leaves and transmit viruses that can lead to stunted growth.
Whiteflies are small, flying insects that feed on the underside of leaves. They can cause yellowing and wilting of leaves, as well as the production of sticky honeydew.
Diseases can also cause yellowing leaves in cannabis plants. Some common diseases that can cause this issue include:
Root rot is a fungal disease that occurs when plants are overwatered or grown in poorly drained soil. It can cause yellowing and wilting of leaves, as well as stunted growth.
Fusarium wilt is a fungal disease that affects the vascular system of plants. It can cause yellowing and wilting of leaves and can eventually lead to plant death.
If you notice yellowing leaves on your cannabis plants, it’s essential to identify the cause of the problem before taking any action. Here are some steps you can take:
Q: Can overwatering cause yellowing leaves?
A: Yes, overwatering can lead to root rot, which can cause yellowing and wilting of leaves.
Q: How often should I fertilize my cannabis plants?
A: This depends on the stage of growth, but most growers fertilize their plants every 1-2 weeks during the vegetative stage and every 1-3 days during the flowering stage.
Q: Can I save a plant with yellow leaves?
A: It depends on the severity of the issue, but in many cases, plants with yellow leaves can be saved if the underlying problem is addressed promptly.