Zinc is an indispensable mineral in your cannabis plants, as it’s needed to create chlorophyll and that obviously has repercussions for the entire plant, especially during the vegetative phase. This tends to occur in plants where the soil has a high pH level and in grows where too much flowering fertilizer has been used. If you wash the roots out too much this can also happen. The best way to solve this deficiency is to spray your plants just once with some liquid zinc solution. Make sure not to spray too much as an excess can be toxic for your plants. It’s detected generally through a complete stop in growth, the leaves get long and thin. You’ll need to take care with this mineral.
This deficiency tends to show up on the smallest leaves, and they tend to suffer from chlorosis or a discoloration of the entire leaf save the veins; they will slowly turn yellow until they fall off. It’s quite hard for your plants to develop this deficiency, but it does happen more frequently in mother plants or plants that suffer a lot of stress during the vegetation period like plants that are pruned a lot or plants in SCRoG systems which involve bending the branches. Basically, any plants that get much too stressed out can develop this deficiency. The solution is that, if you know you’re going to be stressing your plant out, make sure to give it a fertilizer rich in iron in your irrigation water before stressing the plant out to make sure that is has enough iron so that it doesn’t need to take any from the leaves.
Your plants need all of these minerals in the perfect quantities, which can be hard to achieve but if you can recognize the deficiencies then you can easily correct the issue before it gets bad. Generally, your plants will show symptoms on the all of leaves when they’re lacking micronutrients, from the biggest to the smallest leaves, which is how you can tell that the issue is with micronutrients rather than macronutrients.
Now you know what kind of micronutrient deficiencies that your plant can have, how to prevent them and what you can do to solve them if you catch them too late. Keep in mind that excesses of certain nutrients can cause deficiencies, but that’s a topic for another article. If you have any questions feel free to leave a comment and our team of experts will get back to you as soon as possible.
Magnesium shows up as yellow stains on your plants, similar to calcium however the brown edges don’t appear until it’s very advances. It doesn’t tend to have many negative effects and it’s hard to catch in time – the plant sucks the nutrient from the leaves very slowly, so the actual deficiency itself shows up extremely slowly too. It would be fatal for your plants to have this deficiency at the beginning of the flowering period as this is when your plant needs magnesium the most. If it shows up towards the end of the grow then you shouldn’t worry as it’s quite normal. It can be fixed by adding some magnesium to your irrigation water or adding Epson salts to the soil. If you’re using osmosis water, then you’re better off using Epson salts in the soil once they begin flowering to avoid any sort of magnesium deficiencies.
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Manganese is present everywhere in your plants and is directly related to nitrogen absorption – a lack of this nutrient will cause your plants to stop absorbing nitrogen which can be devastating for your plants. It also affects the creation of proteins in your plants so the growth period will slow down quite a lot. The plant will begin yellowing all over, and although it might look like it’s losing all of its nutrients it’s just nitrogen. This can make for some horrible flavors in your weed if it happens towards the end of the grow. You’ll notice the plant getting yellow from the edges of the leaves towards the inside, leaving the central vein in the leaf green. You can fix this deficiency by enriching the soil with a fertilizer rich in manganese during the growth period, and a little bit at the beginning of the flowering phase.
Boron is fundamentally involved in creating the plant’s cellular walls, so small deficiencies are easily distinguishable in small sprouts that haven’t grown yet. These deficiencies cause brown stains, kind of like burns or rust stains. This tends to happen in grows where too much growth fertilizer has been used, and the excess nitrogen blocks the absorption of boron. It also happens in grows where the substrate has gotten too dry, which makes boron rise to the top in the soil and the roots can’t get to it to absorb it. Plants that get a decent amount of boron and a pH between 5 and 7 should have a decent flowering period, a nice calcium absorption and rhe buds wil get even fatter.
We’re going to go through a list of the different micronutrients, how to recognize deficiencies and how to fix them.
Micronutrient Deficiencies in Cannabis – learn how to spot signs of micro-nutrient deficiencies and how to treat them accordingly.
Problem: With a cannabis zinc deficiency, younger leaves start yellowing in between the veins. Leaf tips get discolored and start dying. the leaves may take on a unique banded appearance and the plant may stop growing vertically. There may be much less space between new nodes, which can cause new leaves to start bunching together. If the plant is budding, its flowers may stop growing or even start dying if the problem isn’t corrected.
3.) Take Good Care of the Roots
If you cannot get rid of a cannabis zinc deficiency, please consult our 7-Step Cure to 99% of Cannabis Growing Problems
2.) Give the Right Nutrients
- In soil, zinc is best absorbed by the roots in the 6.0 – 6.5 pH range (although it’s generally recommended for soil growers to keep pH in the 6.0-7.0 range, zinc tends to be absorbed better on the lower side)
- In hydro, zinc is best absorbed by the roots in the 5.5 – 6.0 pH range (although it’s generally recommended for hydro growers to keep pH in the 5.5-6.5 range, zinc tends to be absorbed better on the lower side)
Note: Sometimes a cannabis zinc deficiency (like all deficiencies) can be triggered by stressful conditions and may clear up on its own after the period of stress is over. However, to minimize damage it’s important to react to any growing problem as quickly as possible, especially in the flowering stage.
The truth is, most cannabis growers don’t need to add more zinc in response to a zinc deficiency!
If you suspect your growing cannabis plant has a zinc deficiency due to too-high pH, flush your system with clean, pH’d water. This will remove any nutrient salts that may be affecting the uptake of zinc and help restore pH to the proper levels.
The most common reason growers will see a zinc deficiency is when the pH at the roots is too high. Zinc tends to get locked at higher pH levels and is better absorbed by the plant in a more acidic root environment.
Problem: A cannabis zinc deficiency causes younger leaves to start yellowing in between the veins. Leaf tips get discolored and may start dying.