Manganese deficiency in marijuana plants

Manganese is vital for disintegrating enzymes, creating chlorophyll and as part of the photosynthesis process.

It also makes sure nitrates can be used for creating proteins, very important for marijuana plants.

Manganese deficiency in weed plants is quite infrequent and usually has something to do with a lack of zinc and iron.

Read this article and learn how to recognize and fix a manganese deficiency in your marijuana plants.

Knowing the signs of manganese deficiency

When new leaves begin turning yellow and show small, brown colored malignant spots in the center of the leaf, this is a sign of manganese deficiency.

Usually, the veins on the leaf stay green. The outside part of the leaf turns a dark green color.

If the plant has too much manganese, it will cause a lack of iron. Manganese is fixed and doesn’t travel throughout the plant.

The leaves could turn yellow between the veins, having speckles of brown spots on the damaged leaves.

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It is possible for the lifeless brown spots to expand and destroy the entire leaf. Another thing – the leaves could fragment and disintegrate.

Manganese deficiency will stop the growth of your plant. It starts to become yellow at the bottom of the leaf, then spread more noticeably, getting closer to the tips.

Not sure if your plants have a manganese deficiency?

Read the article Nutrient deficiencies in marijuana plants for a list with pictures of all deficiencies.

How to fix a manganese deficiency

If your plant lacks manganese and you are in desperate need of help, try foliar feeding your plant with a fertilizer that is highly soluble in water and has plenty of manganese in it.

The fertilizer you choose can be a hydro micro, a unique Fe-Zn-Mn fertilizer, or also a manganese chelate.

You can simply add the fertilizer to your water nutrient solution. You can try compost and greensand, as they are high in manganese, but their consumption rate is less.

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List of marijuana plant symptoms

Leaf color: 

• Pale color leaves
• New leaves turning yellow
• Lower and older leaves yellowing
• Yellowing between veins
• Veins of leaves stay green
• Brown or dark spots
• Speckling / patchy pattern

Leaf symptoms: 

• Top leaves / Newer growth damaged
• Lower leaves / Older growth damaged
• Yellowing between veins
• Veins of leaves stay green
• Spots
• Speckled / patchy
• Less growth
• Unusual growth

Plant symptoms: 

• Slow growth

Prevent deficiencies

If the pH is too high, or your plant has an overabundance of iron, it may start showing evidence that it is lacking manganese.

Now keep in mind, once you get rid of manganese deficiency, it could take up to one week before the issue is no longer spreading.

Any leaves that were harmed because of the deficiency mostly likely will never bounce back, so instead look at the other parts of the plant to determine that it is getting better.

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When growing marijuana in soil the roots will consume manganese far better in the pH ratio of 6.0 – 7.0.

Although there are growers who prefer having the pH set more in the 6.0 – 6.5 range when you think you have a manganese deficiency.

If you are hydro growing, the roots will consume manganese much better somewhere in the 5.5 – 5.8 pH ratios.

Usually when hydro growing it is better to have the pH set around 5.5 – 6.5, but manganese does consume better at 5.8.

If you ever think your marijuana plant is lacking manganese, go ahead and fill your system with pure, pH water that has a normal amount of the necessary nutrients for marijuana (which should contain manganese).

Doing this gets rid of additional iron and salts that could be blocking the absorption of manganese.

It also brings the pH levels where they need to be while giving your plant nutrients it was lacking.

You want to stay away from high pH ranges which easily cause your plant to lack the proper amount of manganese.

If for any reason you can’t resolve your deficiency issue, check out our support page for more help.

It takes practice and learning to become a grow expert. Learn how to grow marijuana like a pro in my blog.

Know the best time to reap the fruits of your labor with our free Harvest Guide.

FAQ about manganese deficiency

What causes manganese deficiency?

Insufficient manganese in weed plants usually has something to do with a lack of other nutrients like zinc and iron.

What are the symptoms of manganese deficiency?

Among the most common signs are leaves turning yellow and noticeable small and brown malignant spots in the center of marijuana leaves.

How to fix manganese deficiency in plants?

One good way to fix a manganese problem is by foliar feeding your plant. Use it with a fertilizer that is highly water-soluble and contains sufficient manganese content.

What’s your favorite strain to grow? Please leave comments or questions below and don’t forget to download my free grow bible.

Happy Growing!

Robert