Marijuana nutrient deficiency – Manganese

I love marijuana manganese deficiency

Manganese deficiency

Is it common for marijuana plants?

Manganese (Mn) deficiency is rare when growing marijuana and almost always associated with Fe-zinc deficiencies.

The symptoms

Generally, this deficiency is found in the young cannabis leaves. The tissue of the leaf turns yellow and you find small necrotic areas (small areas of tan/brown dead tissue) in the middle of the leaf. Most of the time the veins stay green. Along the margins the cannabis leaf becomes outlined in a ring of dark green.  Iron deficiency occur when the soil contains too much of Mn. Add to this, that the marijuana plant shows lack of vigor.


It is immobile.

Role in nutrition of the plant

Manganese aids the breakdown of enzymes for photosynthesis production and chlorophyll production. It also helps making the nitrates available for protein production.

Solving the problem

Use foliar feed with a water-soluble fertilizer high in Mn (like Fe-Zn-Mn fertilizer, hydro micros or Mn chelate), for fast relief. Add the fertilizers to the nutrient/water mix. Greensand and compost can aslo be used (they contain Mn) but water-solubles are faster absorbed by marijuana plants than compost and greensand.

Thanks for reading and if you’re not sure what the problem is with your marijuana plants, please post a picture on the forum or email it to me. Visit my webshop for high quality marijuana seeds.


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