Miracle grow isn’t ideal for growing cannabis at all. It’s got way too much nitrogen and your plants aren’t dealing with it very well. The plants should be a vivid green and not such a dark deep green color. First step is to change the feed schedule. Growers that use soil as a media and use salt based nutrients usually alternate between water and water with feed. Some growers even go 2 water to one feed but you want at least one plain water between feeding. Next the feed..... miracle grow does not work particularly well on cannabis. It would be best to use a nutrient specifically made for cannabis if you can. There are many, what country are you in? If you can’t get the correct nutrients you should cut the feed rate to 1/4 to 1/3 of the lower recommendation on the label. Cannabis grows best with less feed as long as you have the proper balance. The burned plant you showed looks to be getting nutrient burn from the fertilizer. Water with ph balanced water well to flush out some of the feed from the pot. After the flush wait till the pot is only half as heavy as it was when freshly watered before rewatering. The plants need that wet/dry cycle to thrive. After a couple water only cycles resume the feed and water alternate cycles. As your plant matures it will need different nutrients and those are best found in nutrients made for cannabis. We have guides here that can get you all the way through the grow. Start here.
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