Symptom Spots or Markings

Root Rot

Root Rot 1

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…

Leaf Miners

Leaf Miners 3

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 5

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

Manganese Deficiency 7

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

Molybdenum Deficiency 9

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

Boron Deficiency 11

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

Copper Deficiency 13

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

pH Fluctuations 15

Quick Summary: Handling pH is vital for marijuana plants to be able to use up nutrients through their roots. When the pH around the roots leaps up and down, it can worry the plant and trigger brown areas to appear…

Leafhoppers

Leafhoppers 17

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 19

Spider mites are part of the mite family and are related to spiders, ticks, and others. Although they’re a common cannabis pest, they can be difficult to eliminate. First Sign of Spider Mite Damage – Tiny Specks (Bite Marks) On…

Nutrient Burn

Nutrient Burn 21

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)

Tobacco Mosaic Virus (TMV) 24

Can Tobacco Mosaic Virus (TMV) spread to cannabis plants? Some growers believe mosaic virus can infect weed, yet actual evidence of cannabis transmission is hard to come by. What is Tobacco Mosaic Virus anyway? TMV is a virus that is…