Hey, I hope my message finds you. I’m reaching out to you hoping that I can get help with a deficiency that I’m facing with my plant and nothing seems to be resolving it. I have what I believe is a phosphorus deficiency. The deficiency started to appear after the plant transitioned to flower. The reason I believe it's a phosphorus deficiency is because of the purple stems of the leaves. I'm using the general hydroponics trio base nutrients. But I'm only using the micro and bloom applying the Lucas formula at half strength. I'm growing in foxfarm happyfrog soil and my ph is ranging between 6.3 to 6.7. The temperature is ranging between 75-85 so no major temp fluctuations. The strain is Tangerine Dream Auto by Growers Choice. At first, I thought it was a Calcium deficiency, so I upped my calmag and fed 6ml of calmag, 3ml micro, and 6ml of bloom per gallon of water. But then I noticed the purpleness of the leaves stems so with more research I came to the assumption that it’s a phosphorus deficiency after transitioning to the flowering stage. In order to provide more phosphorus, I added 5ml of koolbloom to my regular feed and watered the plant yesterday. I’m watering when the first inch of the soil is dry, and I usually lift my fabric pot to feel how heavy it is before I water. I know that sometimes it might take up to a week to notice a difference but today I noticed a wider spread. The rust spots are continuing to form and spread upwards and the growth has slowed down. Is my diagnosis right and did I choose the right way to fix the problem?
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I have 1 plant out of 4 in my tent that has what I call rust spots just like your plant. The leaves get very dry and spots all over. Same PH as other plants same food, all DWC. I flushed with water still getting spots. I think I might loose it. Hope yours gets better
68 degrees water temp should be fine. I wouldn't worry much about the purple stems; some say it could be phosphorus deficiency but there are other signs of phosphorus deficiency that your plant isn't showing. It very well could just be genetics.
The rusting you show on the leaves isn't something that is very common. It kind of looks like calcium deficiency but its not the typical pattern. It's not even listed on GWE diagnose your plant section:
https://www.growweedeasy.com/cannabis-symptoms-pictures
Not phosphorus deficiency. Purple stems happens with some genetics. It could also occur from cold temps (usually during lights off) or feeding too cold of water. Do you know what you night temp has been? Also, what temperature is the water that you give to the plant? The plant looks fantastic besides those few leaves with markings.