Cannabis Leaf Symptoms
Use our cannabis leaf symptoms pictures to quickly diagnose your marijuana plants. Find the pictures that resemble your plants and click on them to learn the solution to your cannabis problem or nutrient deficiency!
Yellow Leaves And Discoloring
The yellowing of cannabis leaves is the most common symptom that growers see in their plants. Yellowing can even be normal in certain situations, but can be lethal in others. Better be safe than sorry. Find your yellowing and learn what to do about it.
Nitrogen deficiency begins with the loss of color in the tip of the leaf. This loss of color will begin to move inward, leaving the leaf completely pale. The leaf will then start to brown and wrinkle, until it finally falls off the plant.
Oldest fan leaves begin to take on a strong yellow hue on the edges and tips, and/or these start to get “burned,” chances are you’re facing a potassium deficiency.
Yellow spots on the edges or between the veins of its older leaves, while the veins themselves remain dark green. The leaves may show spots of necrosis (brown spots), and the most affected ones will fold over themselves and die.
Yellowing of the leaves most noticeable in new shoots. Leaves will begin to discolor completely and will go through the plant as the iron deficiency becomes more severe.
Leaves first turn yellow, then progressively develop brown patches, and eventually die. If left untreated, the deficiency could destroy the entire plant.
The initial symptom of a sulfur deficiency begins as a slight yellowing of the mid-section leaves, which becomes more pronounced in yellowing and then takes on the whole leaf.
Early signs of zinc deficiency occur at the newest growth zones, generally at the top. Shoot tips will wrinkle up close together. Leaves will begin to yellow from the veins out.
Light burn usually causes yellow leaves at the top of the plant directly under the grow lights (though it can appear on older leaves that have been exposed for a long time).
Dark Or Brown Leaves
The reason for brown spots and burned tips/edges in cannabis is harder to identify because they look very similar. Please pay attention to details and check for other symptoms that accompany it.
Old leaves begin to take on a strong yellow hue between the veins or the tips and edges start to get “burned,” chances are you’re facing a potassium deficiency.
First shows on the large, older leaves at the bottom of your plant. The symptoms manifest in leaves that turn dark green and in many cases, get brownish or blueish patches.
Calcium deficiency most often shows up in newer growth and parts of fan leaves that are most exposed to light. Difficult to diagnose since it’s are often accompanied by other deficiencies.
Telltale signs of nitrogen toxicity is too dark green leaves, as well as a claw like look. But flowering plants might have enough energy to use the nitrogen hence producing smaller buds.
Tips of fan leaves begin to curl upward and also exhibit a generally dry and withered look. Leaves will develop large brown spots in irregular shapes along the edges and tips.
The yellow or brown leaf tips are caused by too-high levels of nutrients at the roots, which disrupts the flow of water through the plant and causes the symptom of burnt tips on leaves.
Other Symptoms And Markings
Other symptoms in cannabis plants are mostly related to pests, mold or diseases. Sadly, there are a bunch of organisisms that like to eat on our plants, luckily tho, there are ways to prevent and stop them.
There are three ways bud rot (botrytis) shows. You might see: parts of buds turning dark or discoloring; yellow leaves coming out of buds; web-like mold on on top of the buds.
Leaves first show patterns of tiny spots or stipplings. They may change color, and even curl and fall off. Spider mites activity is visible in the small webs under leaves and along stems.
Thrips rasp the leaf tissue, look out for stains showing up on the surface of the leaves, with a slight silvery sheen. As well as some small black dots that are the thrips feces.
