Also, nutrient deficiencies, whether caused by nutrient lockout , issues with pH, or lack of essential elements, could be the culprit. The key is to look beyond the pigmentation to see if there are any other tell-tale signs that may help pinpoint the problem. I hope this answers your question. Keep on Growing, Lee G. Read next: Should be transplanting my cannabis plants into larger pots in order to have them continue growing through the vegetative stage?
Lee G. Lyzit has been involved in the cannabis industry for nearly 20 years. His passion for natural healing motivates him to learn as much as he can about the miraculous cannabis plant. Stay on top of new content from MaximumYield. Join our email newsletter and get the latest grow tips in your inbox every week. The Importance of Curing Cannabis.
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How to Trellis Your Plants Properly. A Brief History of Jackfruit. This could be nothing more than genetics. There are a select few weed plants out there which have purple stems. However, if you see other signs of trouble, as you will see below, you will need to take corrective action immediately. If your pot plant has purple or purplish stems, you may have a nutrient deficiency issue, specially a magnesium deficiency.
As mentioned above, if your weed plants have a magnesium deficiency , you may see purple stems. However, that is not all you will see. A classic sign of a magnesium deficiency in pot plants is when the leaves slowly turn yellow, especially the tips of the leaves, and eventually, they will turn a red-ish black color.
If you see this occurring, you know that a magnesium deficiency is to blame. Usually, a magnesium deficiency is pretty simply to solve, as it can be caused by a lack of magnesium in the soil or a lack of magnesium in your water or fertilizer.
This issue is pretty easy to solve, as you can mix some water with magnesium sulfate to make a spray which you then spray over the leaves.
Spray the leaves every 3 days until the problem is corrected, using a pure water spray every 10 days to ensure that no residue builds up on the leaves. You can also mix some magnesium sulfate into the water you use to feed your weed plants.
This can occur for genetic reasons in marijuana such as varieties with a properly purple genetics like Purple Afghan Kush or Purple Orange CBD or those that simply grow with the stems in this shade. In this sense, if apart from the purple stems, the plant is in optimal conditions with good growth, proper leaf shape, among others , it is essential not to make changes in one or two weeks for the plant to continue its process of adaptation to the environment.
When the plants have purple stems accompanied by leaves with curled downward nerves of the same shade even developing parts, are black , they may have a phosphorus deficit. On the other hand, if you see plants with yellow leaves that then get darker, along with purple stems, your cannabis may need magnesium. In this situation, you have to provide the plant with the necessary nutrient and it will soon recover and acquire its normal color.
It is important that you do not overdo the amount of nutrients you supply to your plants, as an excess of nitrogen can also produce purple stems and branches and thus other complications.
Of course, you must be aware of other signs to correctly determine that it is an excess of nitrogen, and correct it before it is too late.
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