Root Rot
Cannabis Root Rot – Slimy, brown, twisted or unhealthy roots are caused by unwanted pathogens in your hydroponic tank! The marijuana plant on the left is healthy, and the plant on the right has root rot. The curled, drooping, unhealthy…
Symptom Spots or Markings
Leaf Miners
The term ‘leaf miner’ is a common name for a type of pest actually lives inside the tissue of the leaf. These bugs mine through the leaf eating the best parts, and leave a trail of damage behind. These long,…
Slugs or Snails
Slugs or Snails Attacking Your Cannabis Plants? Get Rid of Them Quick! Ewwww slugs and snails are eating the leaves and buds of my cannabis plants!!!! Although not the most common cannabis pest, slugs and snails are unwelcome visitors when…
Manganese Deficiency
Problem: Leaves may become yellow in between the veins, with mottled brown spots on the affected leaves. These brown dead patches may spread and eventually kill the leaf. Leaves may also shred and fall apart. Overall growth of the marijuana…
Molybdenum Deficiency
Problem: The initial symptoms may appear similar to a nitrogen deficiency (yellowing of older, lower leaves). Leaves may become mottled or spotted. However, the tell-tale sign of a molybdenum deficiency is the leaves may start to display a unique orange,…
Boron Deficiency
Problem: A boron deficiency in cannabis is relatively rare unless a plant is underwatered or in a really dry environment, and is usually accompanied by other types of nutrient or pH problems that appear as problems with theleaves. The first…
Copper Deficiency
Problem: A cannabis copper deficiency appears with leaf symptoms such as dark leaves that take on blue or even purple undertones. The tips and edges of leaves turn pale yellow or white in stark contrast to the rest of the…
pH Fluctuations
Quick Summary: Keeping the pH right is key for marijuana plants to absorb nutrients. If the pH around the roots changes a lot, it can stress the plant. This stress can cause brown spots on the leaves. This issue is more…
Leafhoppers
Does your cannabis plant have leafhoppers? These pests will happily munch on your leaves, leaving brown or yellow spots. They can sometimes spread certain plant diseases so get rid of them quick! Cannabis leafhopper damage There are at least 20,000…
Spider Mites
Spider mites are among the most feared pests in cannabis cultivation, capable of devastating an entire crop in a matter of days. These microscopic arachnids multiply rapidly, sucking the life from your plants and leaving destruction in their wake. For…
Nutrient Burn
Do Your Marijuana Leaves Have Nutrient Burn? Quick Summary: Nutrient or fertilizer burn is one of the most common beginner cannabis growing problems. Too-high nutrients cause the yellow or brown leaf tips at the roots, which disrupts the flow of…
Tobacco Mosaic Virus (TMV)
Can Tobacco Mosaic Virus (TMV) spread to cannabis plants? Some growers think mosaic virus can infect weed. But, finding proof is tough. What is Tobacco Mosaic Virus anyway? TMV is a virus found in tobacco plants. It makes leaves look splotchy…