Northern Light

It's either improper watering or manganese deficiency. Check your soil and see if it is really dry or soggy. If your soil is fine, grab some langbeinite and use it accordingly. I hope this helps.

If I'm not mistaken, this is the beginning of a potassium deficiency... the white will turn yellow/brown and crispy as it progresses. Potassium deficiency delays bud formation, and decreases bud size, weight and density. If the plant lacks potassium in its flowering stage, you will have skinny and poorly developed flowers. You don't have any information on the nutes you're providing but I would increase your bloom nutes to provide more of this important nutrient. If you're growing organically, you might want to add a banana tea or some bone meal... this will also provide good potassium to your plants. I'll disagree with my growmie here in that a pH of 6.0 is just fine - but I would make SURE it IS 6.0. If you use a pH pen, you might want to recalibrate it just to be sure it's reading accurately. If you're using either drops or little strips, invest in a pH pen as those two methods are highly inaccurate (and a pH pen is an invaluable tooll to have in your arsenal!). Also check the pH of your runoff - this will tell you what is actually going on within the root system as far as the pH is concerned... Good luck!

Very interesting. I have not seen anything like this before it looks like a arrow shaped discoloration on the fingers of the fan leaves but only till about half way up the finger before it comes to a point. I would try and correct your PH first and see if this helps it improve at all. 6.0 is kinda low for a soil grow. I would aim to keep that between 6.4-6.8. a bit higher is ok as well up to 7.0. Other photos of the plants make it look they are being overwatered, the leaves a curling down and looking droopy, bit different from nitrogen tox claw or dehydration droop. Best of Luck! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***