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Marijuana plant health problems

 

Below you will find possible causes for problems that you have with your marijuana plants. Remember that your problem is not necessarily a lack of a certain nutrient, the problem is often the availability of it. High pH can prevent plants absorb essential nutrients. Extreme humidity may cause marijuana leaves to remain tissue paper thin. Take small steps in your attempts to balance your nutrient solution. It is better to under-feed your marijuana plants than to over-feed them. Try adding about half of a recommended concentration as you experiment. You can always add more later.

Yellowing of young leaves

Suspected element

Iron [Fe]

Symptoms:

Marijuana leaves on growing shoots turn pale and veins remain dark green. pH imbalances make iron insoluble.

Solution

Foliar feed with chemical fertilizer containing Iron [Fe] or rusty water.

Manganese [Mn]

Symptoms

Necrotic and yellow spots form on top marijuana leaves. Magnese [Mn] deficiency occurs when large amounts of Magnesium [Mg] are present in the soil.

Solution

Foliar feed with any chemical fertilizer containing Magnese [Mn].

Yellowing of middle leaves

Suspected element

Molybdenum [Mb]

Symptoms

Yellowing of middle marijuana leaves.

Solution

Foliar feed with chemical fertilizer containing Molybdenum [Mb].

Yellowing of older leaves

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Manganese [Mn]

Symptoms

Necrotic and yellow spots form on top marijuana leaves. Magnese [Mn] deficiency occurs when large amounts of Magnesium [Mg] are present in the soil.

Solution

Foliar feed with any chemical fertilizer containing Magnese [Mn].

Molybdenum [Mb]

Symptoms

Yellowing of middle marijuana leaves.

Solution

Foliar feed with chemical fertilizer containing Molybdenum [Mb].

Yellowing between veins

Suspected element

Manganese [Mn]

Symptoms

Necrotic and yellow spots form on top marijuana leaves. Magnese [Mn] deficiency occurs when large amounts of Magnesium [Mg] are present in the soil.

Solution

Foliar feed with any chemical fertilizer containing Magnese [Mn].

Manganese [Mn]

Symptoms

Necrotic and yellow spots form on top marijuana leaves. Magnese [Mn] deficiency occurs when large amounts of Magnesium [Mg] are present in the soil.

Solution

Foliar feed with any chemical fertilizer containing Magnese [Mn].

Old leaves drop

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Leaves curl over

Suspected element

Magnesium [Mg]

Symptoms

Lower cannabis leaves yellow and may even turn white while veins remain dark green. Blades die and curl upward.

Solution

This can be quickly resolved by watering with one tablespoon Epsom salts per gallon | 3.5 of water. Until you can correct nutrient lockout, try foliar feeding.

Leaves curl under

Suspected element

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Over fertilization

Symptoms

Causes marijuana leaf tips to appear yellow or burnt.

Solution

To correct soil should be flushed with three gallons | 10 liters of water per one gallon | 3.5 liter of soil.

Copper [Cu]

Symptoms

Fungicide, sulfate [Cocus]

Solution

Apply foliar.

Tips burn on young leaves

Suspected element

Boron [B]

Symptoms

Growing marijuana shoots turn grey or die. Growing shoots appear burnt.

Solution

Treat with one teaspoon of Boric acid [sold as eyewash] per gallon | 3.5 liter of water.

Tips burn on older leaves

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Zinc [Zn]

Symptoms

White areas form at the marijuana leaf tips and between veins. Occurs in alkaline soils.

Solution

Zinc [Zn] deficiency can be treated by burying galvanized nails in the soil. Chemical fertilizer containing Zinc [Zn] can also be used.

Young leaves wrinkle and/or curl

Suspected element

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Boron [B]

Symptoms

Growing marijuana shoots turn grey or die. Growing shoots appear burnt.

Solution

Treat with one teaspoon of Boric acid [sold as eyewash] per gallon | 3.5 liter of water.

Zinc [Zn]

Symptoms

White areas form at the marijuana leaf tips and between veins. Occurs in alkaline soils.

Solution

Zinc [Zn] deficiency can be treated by burying galvanized nails in the soil. Chemical fertilizer containing Zinc [Zn] can also be used.

Molybdenum [Mb]

Symptoms

Yellowing of middle marijuana leaves.

Solution

Foliar feed with chemical fertilizer containing Molybdenum [Mb].

Necrosis

Suspected element

Magnesium [Mg]

Symptoms

Lower cannabis leaves yellow and may even turn white while veins remain dark green. Blades die and curl upward.

Solution

This can be quickly resolved by watering with one tablespoon Epsom salts per gallon | 3.5 of water. Until you can correct nutrient lockout, try foliar feeding.

Iron [Fe]

Symptoms

Marijuana leaves on growing shoots turn pale and veins remain dark green. pH imbalances make iron insoluble.

Solution

Foliar feed with chemical fertilizer containing Iron [Fe] or rusty water.

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Zinc [Zn]

Symptoms

White areas form at the marijuana leaf tips and between veins. Occurs in alkaline soils.

Solution

Zinc [Zn] deficiency can be treated by burying galvanized nails in the soil. Chemical fertilizer containing Zinc [Zn] can also be used.

Manganese [Mn]

Symptoms

Necrotic and yellow spots form on top marijuana leaves. Magnese [Mn] deficiency occurs when large amounts of Magnesium [Mg] are present in the soil.

Solution

Foliar feed with any chemical fertilizer containing Magnese [Mn].

Growth stunted

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Phosphorus [P]

Symptoms

Slow or stunted growth, red stems. Smaller marijuana leaves that are dark green. Lower marijuana leaves are yellow and die.

Solution

Add chemical fertilizer containing Phosphorus [P]. Affected marijuana leaves will not show recovery but new growth will appear normal.

Dark/purple color

Suspected element

Phosphorus [P]

Symptoms

Slow or stunted growth, red stems. Smaller marijuana leaves that are dark green. Lower marijuana leaves are yellow and die.

Solution

Add chemical fertilizer containing Phosphorus [P]. Affected marijuana leaves will not show recovery but new growth will appear normal.

Pale color

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Molybdenum [Mb]

Symptoms

Yellowing of middle marijuana leaves.

Solution

Foliar feed with chemical fertilizer containing Molybdenum [Mb].

Mottling

Suspected element

Zinc [Zn]

Symptoms

White areas form at the marijuana leaf tips and between veins. Occurs in alkaline soils.

Solution

Zinc [Zn] deficiency can be treated by burying galvanized nails in the soil. Chemical fertilizer containing Zinc [Zn] can also be used.

Spindly

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Soft stems

Suspected element

Nitrogen [N]

Symptoms

Pale marijuana plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the marijuana plant.

Solution

Add any chemical fertilizer containing Nitrogen [N]. Treated marijuana plants will recover in about a week.

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Hard/brittle stems

Suspected element

Phosphorus [P]

Symptoms

Slow or stunted growth, red stems. Smaller marijuana leaves that are dark green. Lower marijuana leaves are yellow and die.

Solution

Add chemical fertilizer containing Phosphorus [P]. Affected marijuana leaves will not show recovery but new growth will appear normal.

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Tips die

Suspected element

Pottasium [K]

Symptoms

Affected marijuana plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower marijuana leaves. Red stems. Leaves appear pale or yellow.

Solution

Add chemical fertilizer containing Potassium [K].

Molybdenum [Mb]

Symptoms

Yellowing of middle marijuana leaves.

Solution

Foliar feed with chemical fertilizer containing Molybdenum [Mb].

Bad roots

Suspected element

Phosphorus [P]

Symptoms

Slow or stunted growth, red stems. Smaller marijuana leaves that are dark green. Lower marijuana leaves are yellow and die.

Solution

Add chemical fertilizer containing Phosphorus [P]. Affected marijuana leaves will not show recovery but new growth will appear normal.

Wilting

Suspected element

Copper [Cu]

Symptoms

Fungicide, sulfate [Cocus]

Solution

Apply foliar.