Solving 10 questions: What causes yellow cannabis leaves? Complete with ways to solve and prevent

Are you wondering why?cannabisThe leaves that we plant have changed color, have spots, or have any strange features. I feel that this is definitely abnormal. Perhaps those symptoms are telling us that the cannabis plant is in an inappropriate condition. It should be addressed urgently before it spreads. This article will tell you what causes the yellow leaves of cannabis. Along with methods to fix and prevent it at the right point.

What are the symptoms of yellow cannabis leaves?

For those who grow cannabis Before seeing the yellow cannabis leaves Cannabis leaves have many observable symptoms. It depends on what causes yellow cannabis leaves, such as bent leaf tips, soft stalks bent down, patterns or spots on the leaves, leaves curling, leaf edges starting to flip. The bottom of the plant is starting to turn yellow. The tips of the leaves are starting to turn yellow or brown, the leaves are dry, or the leaves are beginning to have small spots scattered about. If you find that cannabis has symptoms like this, don't be alarmed. There are enough ways to fix and prevent it.

10 causes of yellow cannabis leaves

Yellow cannabis leaves can be caused by many reasons. Both from the environment, soil, water, sunlight, nutrients, pests, and various disease outbreaks. Each cause has different initial symptoms. And there are different ways to fix yellow cannabis leaves. But don't worry, let's take a look at the various causes in detail. Let's go together.

1. Watering too much or too little

The first and most classic cause is watering too much or too little. First of all, you have to understand. that cannabis plants like alternating dry and wet conditions Watering too much or too little will cause the cannabis leaves to yellow. If you water too much, the cannabis plant's leaf tips will be bent. Lack of oxygen and roots rot. If you water too little, you will notice that the stalks begin to weaken and bend. The leaves then begin to turn yellow and dry out.

How to fix and prevent

• Water when the soil begins to dry out. Use your hand to touch the soil about half a knuckle deep first.
• Try lifting the pot to measure the weight of the soil when it's dry and when it's wet. When you try to keep lifting it. You'll start to realize that the weight has decreased around this time. It's probably time to water it more.

2. The pH of the soil is unbalanced.

Do you remember the values ​​of acidity and alkalinity that you learned about in science class? Yellow leaves on cannabis plants can also be caused by an unbalanced pH level in the soil. This is something that many people understand. People often overlook that the pH level that is suitable for cannabis is 6.0-7.0, maybe a little more or less than this. The pH value exceeds this much. This will cause the cannabis to enter a state of Nutrient Lockout, or the roots are unable to absorb nutrients. This causes the cannabis leaves to turn yellow or there may be stripes or spots on the leaves.

How to fix and prevent

Try measuring the pH of the soil before adding nutrients and fertilizer. If the soil is too acidic-alkaline, gradually Add substances to help bring the soil into balance.

3. Too much exposure to light or sunlight.

Yellow cannabis leaves are also caused by too much sunlight. This is because cannabis can withstand only a certain level of heat from light. If it gets too much, the leaves will turn yellow or brown. Leaves may curl or leaf edges begin to flip. The upper leaves are exposed to full light. The leaves will dry out and die faster.

How to fix and prevent

This problem usually arises from indoor growing. This can be prevented by placing lights at the appropriate level. Or fix it by moving the light higher and further away from the cannabis plants. Or use a light meter (Lux Meter) to check the amount of light the cannabis receives.

4. Receiving too little light or not getting enough sunlight

Getting enough light is very important for plants to photosynthesize. If it receives too little light or the sun doesn't reach it, for example, shadows occur causing the leaves below to not receive enough light. This will cause the leaves to begin to yellow and fall off. But that's not enough, the cannabis plants will also slow down their growth. Try to stretch out towards the light. and may stop growing at all

How to fix and prevent

• Prevent and cure yellow cannabis leaves by increasing the use of high quality LED bulbs that can distribute light well because LED lights generate less heat than other types of bulbs and are energy efficient.
• Trim off some of the upper leaves. So that the leaves below receive enough sunlight.

5. Malnutrition

Another main cause of yellow cannabis leaves. It is caused by a lack of nutrients in cannabis. Just like people, we should get enough essential nutrients. For cannabis, nutrients that when lacking will cause the leaves to turn yellow, such as nitrogen, iron, and magnesium. If there is a lack of nitrogen, it can be noticed that the bottom of the plant starts to turn yellow. If you lack calcium or magnesium which is a substance that helps transport nitrogen The leaves will have brown spots when nitrogen cannot be transported to the leaves. Makes the cannabis leaves yellow as well.

How to fix and prevent

• If there is a lack of nitrogen Water with a nutrient solution that is high in nitrogen. This can be seen from the NPK ratio that comes from Nitrogen, Phosphorus, and Potassium, respectively. Choose a value with the highest first number, such as 20-0-0 or 30-0-0.
• If you lack iron Add fertilizer formula to make flowers.
• Lack of calcium and magnesium Put dolomite inside the plot. which has high amounts of calcium and magnesium Or spray the leaves with calcium nitrate.

6. Apply too much fertilizer.

Cannabis blight or yellow cannabis leaves are caused by excessive fertilization. Too much of anything is not good. Because providing too much fertilizer will cause the roots to absorb too many nutrients, causing more nutrients to accumulate in the leaves as well. You will start to see signs from the tips of the leaves starting to turn yellow or brown. The leaves are crisp and twisted.

How to fix and prevent

• Rinse the soil with clean water. Water so that plenty of water flows through the soil. Until the rinsing water comes out clear.
• Stop adding fertilizer for now. If you want to add it, use liquid fertilizer and spray it on the leaves.

7. Diseases and pests

Diseases and pests can cause yellow cannabis leaves. There is no problem with just growing outdoors. Growing indoors can also face this problem. Diseases that can be found from floating spores or roots, such as leaf spot, downy mildew, leaf edge dryness, wilt, and canker. Pest enemies that can be found include aphids and caterpillars. Such problems cause cannabis to use energy to repair damaged parts. It causes the leaves to turn yellow because chlorophyll production is reduced.

How to fix and prevent

• Use neem oil to deal with pests.
• Growing companion vegetables is another way to repel pests.
• To prevent disease outbreaks, add mycorrhizal fungi to the soil.
• When he saw that there was a tree that was dying quickly Get rid of them quickly before the disease spreads.

8. Temperatures that are too hot and too cold

Yellow cannabis leaves can also be caused by temperature. Either it's too hot or it's too cold. Even when we ourselves are in hot weather, it feels like we are melting. Or in extremely cold weather it seems like you'll freeze to death. It's no different for cannabis. If it is too hot, at temperatures of 28 degrees Celsius or higher, the leaves will dry out and the water will evaporate too quickly. They cannot photosynthesize properly until the leaves turn yellow. Temperatures below 10 degrees Celsius also cause cannabis leaves to yellow.

How to fix and prevent

• If the temperature is too hot when grown indoors, increase air circulation. By using an air conditioner or a small fan.
• Plant outdoors to add shade to the cannabis plants. in order to reduce the temperature
• The temperature is too low. Make a greenhouse or Plant covering.

9. Leaf disease

Leaf Septoria is a fungal disease or infection that causes cannabis leaves to turn yellow. It starts with the leaves starting with small, yellowish spots. Then it starts spreading from one leaf to the surrounding leaves. quick side Then the spots turn brown. The leaves begin to turn yellow and eventually wither.

How to fix and prevent

• Always observe the cannabis leaves regularly. If you see any abnormalities, immediately cut off infected leaves.
• Cannabis plants that have already been infected with leaf disease It must be coated with neem oil. This will help destroy germs in areas that cannot be seen.
• To prevent leaf disease from returning again Increase air circulation within the growing area. May use a small fan to help.
• Clean the base of the plant and remove any leaf debris.

10. Root rot

Yellow cannabis leaves are caused by root rot that is most often the result of excessive watering. Overwatering will allow pathogenic microorganisms to grow in the soil. And these microorganisms will eat the roots of cannabis. Hinders the absorption of various nutrients When they don't get enough nutrients, the leaves begin to yellow and wilt. If this isn't corrected quickly, your cannabis plant will slowly die.

How to fix and prevent

• Add mycorrhizal fungi to the soil. To help eliminate harmful microorganisms
• Be careful of watering too frequently and in excessive amounts.
• Trees with very rotten roots Move the cannabis plant to a new location. To eliminate residual microorganisms

Symptoms of yellow cannabis leaves can be seen at the beginning when the leaves begin to have small spots, the tips of the leaves are bent, the young stalks are bent down, the leaves are curling, or the plant's underside is starting to turn yellow. If not corrected quickly, it will cause the leaves to turn yellow. And it may dry up and fall off until the cannabis dies. The cause of yellow cannabis leaves is from too much watering and the roots can rot. Too much light, lack of nutrients, unbalanced pH and alkalinity in the soil. Diseases and pests, leaf diseases, too hot or too cold temperatures Basic corrections and prevention can be done by placing cannabis plants in the right environment. Not too much or too little And frequently observe any abnormalities in the cannabis plants. So that it doesn't spread and the cannabis leaves become beautiful again.