Detect and effectively treat cannabis deficiency symptoms

In this article, we'll show you the most common nutrient deficiencies in cannabis plants, how to identify them, and how to correct them with targeted Advanced Nutrients products from Wondergrow.de .

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1. Nitrogen deficiency (N)

Symptoms: Older leaves turn yellow, wilt, and fall off.

Cause: Insufficient nitrogen supply, often during the growth phase.

Treatment: Nitrogen-rich base fertilizer + targeted support.

Recommended product: Advanced Nutrients Revive

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2. Calcium-magnesium deficiency (Cal-Mag)

Symptoms: Brown dot spots, stunted young leaves.

Cause: Cal/Mag deficiency in the water, pH blockages, root stress.

Treatment: Cal‑Mag addition + pH control.

Recommended product: Advanced Nutrients Sensi CalMag Xtra

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3. Phosphorus deficiency (P)

Symptoms: Dark green or blistered leaves, red leaf veins, stagnation in growth.

Cause: Cold soil, high pH > 7, too much nitrogen.

Treatment: Liquid phosphorus fertilizer during the flowering phase.

Recommended product: Advanced Nutrients Phosphorus Booster

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4. Potassium deficiency (K)

Symptoms: Brown or burnt edges, leaf tip curls.

Cause: Potassium-poor substrate or low temperatures.

Treatment: K-rich fertilizer during flowering phase.

Recommended product: Advanced Nutrients Potassium Booster

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5. Magnesium deficiency (Mg)

Symptoms: Yellowing between leaf veins, later brownish spots.

Cause: Imbalance in the nutrient mix, acidic pH.

Treatment: Epsom salt foliar fertilization / Mg application.

Recommended product: Advanced Nutrients Magnesium Supplement

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6. Iron deficiency (Fe)

Symptoms: Young leaves turn yellow while the veins remain green.

Cause: pH > 7 or phosphorus blockage.

Treatment: Administer chelated iron (e.g. via Cal‑Mag).

Recommended product: Advanced Nutrients Sensi CalMag Xtra

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7. Manganese deficiency (Mn)

Symptoms: Yellow spots on young leaves, fine necrotic spots.

Cause: pH too high or competition from iron.

Treatment: Reduce pH to 6.0–6.5 or supplement Mn specifically.

Recommended Product: Advanced Nutrients Manganese Supplement

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8. Sulfur deficiency (S)

Symptoms: Yellow-green discolored young leaves, red leaf stalks.

Cause: pH blockage due to calcium, insufficient sulfur supply.

Treatment: Sulphur-containing fertilizer + pH control.

Recommended Product: Advanced Nutrients Sulfur Supplement

9. Molybdenum deficiency (Mo)

Symptoms: Discoloration between the leaf veins (intercostal chlorosis), spreading from the center of the leaf outward. Later, leaf distortion also occurs.
Cause: Too low a pH value (< 5.5) blocks uptake. Rarely occurs with good substrate.
Treatment: Raise pH to 6.0–6.5 + apply Mo-containing fertilizer.

10. Copper deficiency (Cu)

Symptoms: Leaves appear "metallic," exhibiting a shiny, dark green to blue appearance with brown necrotic spots. Growth is inhibited.
Cause: Excess of zinc, iron or pH outside the optimal range.
Treatment: Check pH, balance microelements, and apply targeted fertilization with copper chelate.

11. Boron deficiency (B)

Symptoms: New shoots die or grow deformed. Roots shrivel, leaves curl and tear.
Cause: pH too high or lack of water; boron is very mobile and is easily leached out.
Treatment: Add boron via special microelement fertilizers, moisten the substrate thoroughly.

12. Zinc deficiency (Zn)

Symptoms: New leaves remain small and deformed. Chlorosis develops between the leaf veins. Internodes become shorter ("bush-like").
Cause: Often caused by water that is too hard or has a high pH value (> 7).
Treatment: Apply zinc chelated fertilizer + adjust pH to 6.0–6.5.

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🌱 Conclusion & Tips

• Compare precise diagnosis with images.
• Always check pH (soil: 6–6.8, hydro: 5.5–6.5).
• Use targeted products:
• Revive – Nitrogen Imbalance
• Sensi CalMag Xtra – calcium, magnesium, iron
• Booster & Supplement Series – for P, K, Mg, Mn, S
• Regular pH control and monitoring ensure long-term health.
  
  
  
  

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Source: Images from external sources (GrowWeedEasy, Dutch Passion, Organitek) and product information from Advanced Nutrients