My dad had been growing for awhile now but he is running into this on a few of his plants. He hasn't changed anything from previous successful grows. Water, soil, nutrients is all the same and fresh.
These were started indoors until about two foot tall and planned outdoor. Zone 5B. Watered daily, no water logging off soil. All three were started from seed and all the are different strain. My dad is very experienced with this but I am not. If I left anything important out please let me know and I'll get the info from him.
I think he is going to try the flush and see how that does. My folks have the great well water. He used to test the pH prior to every water but it was always at an ideal level.
Everyone here was so happy to help out with this. This community is great. Thank you everyone.