They started to turn Yellow like this a few days ago, leaves are also dropping. Are they almost ready for harvest? I have 2 plants and both have leaves that’s turning yellow and dropping.
Whats your ppms your feeding at? Ph? Also its normal for lower leaves to turn yellow. Have u looked with a jewlers loop yet? Strain? How far into flowering r u?
Last time I fed them PPM was at nearly 900, PH was 6.5, strain is Blue Dream and it’s on day 61 of flower
It has to be close its a 8 to 9 week indoor flower strain. Id say get the ppms going down and start to flush
Time for a good look with a jewelers loupe.
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Use a loupe or a 30x-60x scope and look at the trichomes on your flowers (not the sugar leaves).
If you’re indeed at 61 days I’d plan a flush with 3x your container size worth of properly pH’d water.
The leaves look like you’ve had some nitrogen toxicity, but at this point I wouldn’t do anything other than the flush. You’re in the home stretch 
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Never made a grow before. From what I read and seen. Looks like they are very close if not ready.
Fan leaves are dying due to shes approaching the end of her cycle & eating thru the leaves as well. Start checking your trichs