Cannabis Leaf Symptoms to Identify Plant Problems (By Pictures)

This cannabis leaf symptom checker will help you to quickly identify marijuana plant problems and easily diagnose sick marijuana plants!

Learn more about common cannabis leaf problems, nutrients, diseases, stresses, pests, and bugs. Click on any picture for detailed information about a particular marijuana problem, deficiency or symptom and find out what’s wrong with your plant.

Nutrient Problems

Cannabis Nutrient Deficiency Chart

Major and Minor Elements	Excess	Deficiency
Nitrogen Deficiency	Yellowing of leaves is traveling upward fast	Pale Color Leaves Yellow Leaves Yellowing Between Veins Old Leaves Falling Off Withering / Sagging Leaves
Phosphorus Deficiency	Darkening (dark green, blue, or gray) of the lower, older leaves Thickening and spot forming (bronze, purple, or brown in color) on lower leaves Mottled or mosaic-patterned leaves	Yellowing of leaves Twisting and curling of leaves Burning and dying of leaf tips Old leaves falling off Stem discoloration (red or purple) Twisted or stunted new growths Root rot
Potassium Deficiency	Brown or burnt leaf edges Dark, brown spots Stretching – characterized by large spaces between nodes Plant is too tall	Pale colored leaves Yellowing of the lower, older leaves Death of leaf tips Spots on leaves Older leaves falling off Slowed growth Curling leaves (under or upward) Buds not getting fatter
Copper Deficiency	Browning or burnt leaf edges Slowed growth Twisted or abnormal plant growth
Boron Deficiency	Purple or darkened leaf color Dark brown spots on leaves Thicker growth tips	Browning or burnt leaf edges Slowed growth Twisted or abnormal plant growthCopper Deficiency
Calcium Deficiency	Leaves’ green color darkening Large, light brown necrotic spots	Tips of leaves curling Leaves are dying off Stunted growth Young shoots are discolored – purple or yellow Stems and branches are weak Roots may begin dying off or turning brown
Iron Deficiency	Signs of deficiencies in other nutrients such as manganese, phosphorous, zinc, calcium, or copper	Young leaves turn pale yellow  Minimal bud sites
Magnesium Deficiency	Petioles and stems become purple in color Light brown spotting on the edges Development of red stems	Yellowing and weakening of the lowest leaves Leaves start turning inward and soon die Growing shoots will start going from pale green to white
Manganese Deficiency	Speckling / Patchy Pattern Top Leaves / Newer Growth Damaged	Pale Color Leaves New Leaves Turning Yellow Yellowing Between Veins Slow Growth
Molybdenum Deficiency	Mottled, spotted leaves Abnormal coloring that starts at the leaf’s center	Older leaves located towards the base start to yellow Discoloration of leaf edges: orange, red, or pink in color around edges
Sulfur Deficiency	Upper leaves and newer growth damaged	Pale color leaves Yellow leaves on lower leaves Yellowing between veins Limited plant growth Buds not thickening
Zinc Deficiency	Speckled / Patchy Pattern Non-vertical Growth	Yellow Leaves On New Growth and veins Leaf Tips Appear Burnt Leaves Curl Under

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Diseases

Pests

Stresses

Our Plant Protector Sets will help you prevent a lot of these issues. Read comments from these happy customers and see for yourself!