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The entire rest of the plant has normal, healthy looking leaves. My temp is between 75 to 77 during the day and around 70 at night. My light is at 18" above the top of the plant. The dolomite lime I have been adding to raise the runoff PH has calcium and magnesium in it. My last runoff PH was 6.0.
Lets tag in an expert. @Myfriendis410
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I should also mention I have been keeping the humidity between 40 to 45% for the past week or so. Currently in third week of flower.
The RH% I have never cause these issues before. Not even when I found out my pH of my water can hit 8.7 p)H.
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Was that runoff PH or just your tap water PH?
I mix the dolomite into the soil before planting. This is what happened to my blueberry when top dressing with dolomite. I believe it to be a magnesium tox. This what you’re seeing?
That is my tap water pH can got from 6.5 to 8.7 which is crazy swings.
It’s similar but not exactly the same. You have some burnt tips and none of mine are. You also have damage on the lower leaves and mine is only at the very top. The leaves also look a little more crinkled around the edges on some of your damaged leaves. Thanks for helping. Maybe mine will progress to this, who knows.
What ended up happening with that plant? Did it produce some good bud anyways?
@smokysmurf
Being only on the top is a clue to what’s going on. Cannabis will rob nutrients from other parts of the plant to feed new growth when there’s a deficiency ( mobile nutrients ) some nutrients like calcium don’t move easily through the plant ( immobile ) and you will see new growth will be affected the most. I’m still leaning to a phosphorus calcium issue since they work in combination.
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My dolomite lime has calcium and magnesium in it. I think this goes back to my runoff PH being too low to absorb the calcium and phosphorous which according to the many charts I have looked at want a PH around 6.2 minimum to uptake.
I am hoping my plant will make it through flowering and produce a decent harvest although the buds require lots of Phosphorous, right?
After flushing last weekend my runoff PH got up to 6.2 but after the last watering was back down to 6.0. It sounds like adding more lime is the best chance of getting the PH up and adding more cal and mag.
They won’t look pretty but you should be fine once you get everything dialed in. Mine looked awful and I still pulled 20oz off three plants
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This is what I surmise too. Phosphorus is a heat regulator for the plant and those leaves being closest to source of heat…interveinal chlorosis leads to calcium def.
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That’s what I’m worried about. I don’t know how to remedy this. My runoff PH is 6.0 and I have created posts about my soil and low PH and nobody has a concrete solution to raising my PH. I am hoping she will make it through flowering since 95% of the leaves look great. I have noticed my flowers aren’t getting much bigger and none look like actual buds yet, so I am worried about that.
I read your entire white widow journal you tagged me on and the picture of your leaves with the phosphorous deficiency don’t look anything like mine.
Im unsure what can be done with your soil . I only grow in coco which I find to be a very easy media to work with . I just noticed your growing auto flowers. I have never grown one but I have read that they don’t handle stress well and this might be part of the reason your growth has stalled.
Do you have any suggestions on what I should do at this point? I am doing everything I can to raise the PH without much luck.
Would it help to raise my light? The top leaves are already damaged beyond repair. They are around 50% brown. Should I just sacrifice those top leaves and hope the rest of the plant stays healthy?
The plant definitely went through a stretch and more than doubled in size in a matter of two weeks. It hasn’t grown any taller at all in the past week. As far as the flowers not growing very fast, that is a concern. There are a lot of them though.
