there he is again... lol

a plant with a deficiency is going to do everything it can to keep the new growth happy... so ignoring old leaves is a huge mistake. unless you are dealing with a deficient immobile nutrient, new growth will almost always look fine... until of course the deficiency reaches the top overtaking the whole plant.

JT, here is how it works... there are mobile nutrients and immobile nutrients. Nitrogen, Phosphorus, and Magnesium all fall into the category of mobile nutrients. A plant considers new growth (the top) the most important, and will give new growth priority. If nutrient is mobile, then it will transport it from older leaves to newer leaves... and your deficiency will show up on older leaves.

On the flipside, if your nute deficiency is due to an immobile nutrient, then the plant cannot transport the nutrient to the new growth, and your deficiency will show on new growth.

Purple stems can be anything from over-fert (causing nute lock-out), to a lack of N, Mg, or P.

Hope this helps.

If you can provide details on your set-up and how the plants have been treated, it's very possible to diagnose the problem. Usually, in providing those details, you will divulge what you did wrong, and someone will point it out allowing you to correct the problem... and enjoy a bountiful harvest.

best of luck to you.
caregiver99 Reviewed by caregiver99 on . Purple Stems I am about two weeks into the flowering stage of an unknown strain. I grow in a deep water hydroponics kit, and the stems on the fan leaves have turned to a deep purple color. Some of the fan leaves have turned yellowish and seem to be drying out. The buds however seem to be unaffected, along with the stems they are on. Any suggestions will be much appreciated.:thumbsup: Rating: 5