Phosphorous def is my 1st guess.What’s happening here? ...all pics are of the same plant...
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Maybe a dehumidifier and close it at night?My greenhouse has humidity levels of over 90% in the early mornings.... already found a little bud rot on my granddaddy purple...had to cut a few buds out. I now have 2 big box fans running on that plant. Is there something else I can do to bring it down? Will the humidity levels in the morning get lower as September rolls in? At this point I’m gonna need like 20 fans blowing in there lol
Those leaves turning purple might be temperature related depending on the temp at night...
So I brought my Vivosun fan up to my hoop house and installed it up high on one of the ends and had it blowing air OUT of the space.... humidity this morning was down to 82%!! So it certainly did something! Brought it down at least a good 10% I’d say... my space isn’t fully enclosed yet but I think I will close it in sooner rather than later and bring up a dehumidifier as well and see what that does as supernutz suggested.... I’m hoping with all my other fans and the dehumidifier in an enclosed space will bring the humidity down to more reasonable numbers.I put this exhaust fan on the end of my greenhouse,it keeps the humidity the same as the outside. If your humidity outside is high 90% it might not work.