BIG brown area on leaves

Three of my eight plants have some of these BIG brown area/spots on some of the leaves. So my question is what do I do to help stop the issue. Here are the specs on my grow.

1) Using Miracle Grow â??mixâ?� (not soil). Yes its mix and not soil, I just realize my screw up but in this deep 8 weeks and can not turn back.
2) About 3 weeks ago used MG (diluted) liquid fertilizer. Most of my plant tips are brown so I must have not diluted enough
3) About 2 weeks ago change my lighting to three 90W LED UFO lights one 126W LED
4) About 2 weeks ago transplanted to bigger pots
5) Temp is 75 to 80 degrees

:mad:

How do I stop big brown area on leaves?
Did I really screw up by using MG potting â??mixâ?� and not â??soilâ?�?
Shock from new lights?
Shock from transplanting?
All of the above?

Thanks for any ideas/input

were they fine before adding the liquid ferts?

Yes they were healthy (no brown spots or brown tips) before I used the MG fert. I have the Bontancare (soil) fert kit on its way to me.

If I shocked them with too much MG fert how long typically to recover?

yeah it looks like fert burn, basically u gotta always keep track of what your doing.if u did this +this and this hapends but you do this+ this +this and this negative shit happends but your first 2 adjustments didnt cause any problems then the third one is your factor. flush your soil with plain ph balanced water. i would bet that u wont even need any nutes for some time because of the soil your using.but im not really a soil guy and have never used mg.good luck

Thanks, appreciate the feedback/insight. Just over the last two days plants looks to have calm down and recovered a bit. I will keep flushing and wait for few weeks before using better fert next time.

I have learned a lot and for next grow will be smarter about it. Thanks again for the help.

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Originally Posted by scottcc5s

Thanks, appreciate the feedback/insight. Just over the last two days plants looks to have calm down and recovered a bit. I will keep flushing and wait for few weeks before using better fert next time.

I have learned a lot and for next grow will be smarter about it. Thanks again for the help.

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does your MG feed for a period of time?:rasta:

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Originally Posted by LetsSeeYa

does your MG feed for a period of time?:rasta:

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Yes, it says 2 months continues feeding (Miracle Grow organic). I am 9 weeks in the grow/veg from seeds and was thinking going to flower stage next weekend.

Just got the Botanicare Pure Blend kit and was thinking of using the "bloom" part of the kit. Good idea to use the Botanicare bloom with this MG organic setup I have?

u want to wait until your plants have used up all the food thats allready available.heres what i would do.i would wait 10 weeks.flush the crap out of your plants.switch to 12/12 and use veg nutes "botanicare is fine" for the first week of flower,then switch to your bloom nutes.

Quote:

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Originally Posted by disrupt86

u want to wait until your plants have used up all the food thats allready available.heres what i would do.i would wait 10 weeks.flush the crap out of your plants.switch to 12/12 and use veg nutes "botanicare is fine" for the first week of flower,then switch to your bloom nutes.

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Thanks again and will do. Last question for you, since I am in soil how often should I flush? Is this a daily thing, ever other day, etc.? Just want to make sure not to over water.

My temp in the grow tent is good (75 to 78)