i have 5 plants and the one that used to be the biggest best one is now looking like crap, first the leaves turned yellow and the got crispy and dry so i cut them all off and she is looking sad, is she gonna make it? Im not doing anything differant to her than the rest of them and they look perfect

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Without a picture the best I can do is guess. Do you ph test? What is the temp of your grow area? Do you use fertilizer? At what strength? What type of light do you use? How far away from the light are your plants? Do you have a mositure meter?

Use this chart to match your leaves:
Grow Marijuana FAQ, Cannabis cultivation - marijuana growing tips & photos

yes i have a moisture meter, no i dont check ph, but all other plants are doing just fine, i am using 125 watt envirolites and flouros its about 3 inches from the tops of the plants the temp is about 72-78F

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Did you use the chart provided to match up your leaves against what they have listed?