Well mephisto was not lying about OSMH being a sensitive plant. I noticed an issue yesterday with some brown spots on the edge of the older fans and it spread quickly. I'm glad I caught it early and was able to react. I'm thinking it was excess P by the looks of it, or some secondary lockout. Not quite sure.
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Earlier yesterday I flushed the pot with about 3/4 gallons of 410ppm 6.3ph feed. When I checked it later last night I noticed a bit of tip burn and also a few small brown spots on the DG as well and my spidey senses started tingling
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So I went ahead and flushed all of them including the OSMH again with a lighter feed of 350ppm 6.1ph and some yucca. I went pretty excessive on this one just to be extra safe. I don't normally do this when I switch to my feed schedule but I figured better safe than sorry. I may not have been watering enough initially to flush everything out and get it to more of an equilibrium with the feeds.
This morning they were all looking much better and more perky, most had a lot of growth on them. The tip burn on the OSMH has receded and it seems to still be growing despite. Not sure if I've solved the issue with the spots but I'm hoping I'm in a better place now.
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I checked Mephs website again on the OSMH and it says it won't need much feed till about 5 weeks, wishing l had held off before feeding but I'm hoping it'll rebound now. Something to note for the future.