Personally I wouldn't worry about it. In my 2 years of growing I've found that many of the larger fan leaves always start to yellow once I get midway or so into the flower stage. Starts at the bottom and works its way up. To me they look fine.
I use a small Honeywell ceramic heater, low is 150 watts and high is 300 watts. I put it on the floor in the center of the tent. It comes on when the lights go off. It's enough so it doesn't go below 20 C at night.
Hi. I feed every 3 to 4 days, a gallon per plant, there is no runoff but the mix is saturated I think. I've never watered to runoff in the few years I've been growing, never felt it was necessary for me.
I have grown the Widow Bomb strain 3 times now from seed, on my last grow I decided to take a couple of cuttings and see how I would fare at growing a couple of clones. It's been about 10 weeks now since I took the cuttings. They were growing really well until a week or so ago, the newer leaves...
I have been using the 5 gallon fabric pots and ProMix HP. I start the seeds in Jiffy peat pods, those little pucks you soak in water. Once germinated I transfer to a Solo cup. Once it has 4 or 5 sets of trues leaves it goes into the 5 gallon pot. I usually veg for 6 weeks and I wouldn't use...
I know this goes against common practice but I never flush, I feed right up until the last week. I have not found my harvest to be overly harsh. Lost my sense of smell & taste years ago so I can't say how it affects it in that regard.
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Those plants are to small to be transplanting now. Wait until you have 4 or 5 sets of leaves. I often use a fertilized potting mix in the Solo cup, usually Pro-Mix Organic. I transplant into 5 gallon pots of Pro-Mix HP which has no nutrients. Fill the pot that is to receive the transplant around...
My thought is that it is a Cal-Mag issue. I had a plant where the leaves were turning like that. I upped the Cal-Mag in my nutrient solution and it stopped. Didn't help leaves already affected but no more appeared. I'm not an expert and could very well be wrong but that's what it seems to me.
I had a couple of plants in early veg that started to get leaves like that. This was my first attempt at growing in super soil, normally I used ProMix HP. I think my issue was PH because I was adjusting to 5.8 - 6.0 when I should've had it higher, around 6.5.