Leaf edges lightening

Greengal

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Hello new grower here, thanks for having me. I have 3 plants of different strains that are starting to lighten around the edges and I don’t know exactly why. They’re about 2 weeks old. I gave them their first nutes a couple days ago (GH, 1/4 tsp micro, 1/8 tsp each of flora and bloom per gallon), the temperature ranges in the 20s, though it dropped to 15 last night and humidity between 55-75%. They’re under a dome right now. I mist when the humidity drops below 65%. I haven’t watered much because the top of the soil feels moist all the time and worry about overwatering. I’m growing in promIx HP with added perlite. I use well water with a pH of about 7. I have 450 W LED lights at 25% set about 5 inches above the tallest plant and dome. Could it be stress due to the fluxes in their environment? This is my first grow so I really have no clue. I have already had 1 seedling completely die on me so I’d like to nip this in the bud... 😏 The panic in me says to give them more nutes... Help would be very appreciated thank you!
 

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WeedHopper

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You need your PH between 6.5 and 6.8.
7.0 is a little high and can lock out nutrients that the plant needs.
Also you need to add CalMag once you get your PH down.
 

Greengal

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Ok thanks. If the pH gets closer to 6 will that harm the plants? I am just using a test kit right now where you have to compare the colours. Not ideally accurate. And for calMag would I add it every watering or just when I add nutes?
 

Bugus_Monkey

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Based on this
I would say that you are sort of on your own nutrient wise. I would go ahead and mix your next feeding at about 50% strength and work up to 75. I rarely use 100% but that is just me. - Looking the attached page over it appears that there is not many nutrients already built up into that stuff to begin with. I Could Be and hope I Am Wrong!!! - And I sincerely hope more people chime in. Being your first grow, you may have challenged your self just a little with your soil choice. Don't give up. And yes - Cal mag - I'm guessing at least 1/2 a Tblespoon to Gallon. Wait and weigh in more responses. Hopefully this attracts more attention to your thread. Lot's of great growers here. better than me.
 

SubmarineGirl

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as a new grower, I’ve found using a nutrient enriched soil helps plants check themselves during transplant. You also don’t have to worry about adding additional nutrients except maybe calmag until the plants use that what’s in the soil already. May want to try some different medium when you next transplant them To see how they do.
 

Greengal

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Based on this
I would say that you are sort of on your own nutrient wise. I would go ahead and mix your next feeding at about 50% strength and work up to 75. I rarely use 100% but that is just me. - Looking the attached page over it appears that there is not many nutrients already built up into that stuff to begin with. I Could Be and hope I Am Wrong!!! - And I sincerely hope more people chime in. Being your first grow, you may have challenged your self just a little with your soil choice. Don't give up. And yes - Cal mag - I'm guessing at least 1/2 a Tblespoon to Gallon. Wait and weigh in more responses. Hopefully this attracts more attention to your thread. Lot's of great growers here. better than me.
Thanks for the input. I’m waiting for CalMag in the mail, couldn’t find any locally. Gonna try increasing the strength of my feeds
 

Greengal

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Thanks everyone for the tips. Thought I’d give an update. I have since been adjusting my water pH to 6.5. 2 of the plants seem to have responded well, the yellowing has gone away, while one (#2) is still struggling a bit. I think I left them under the dome for too long, the leaves of one of them was touching the dome and now has what looks like burn on the leaves (#1). I potted them up into 1 gallon pots a couple days ago and removed them from the dome and watered them in with the same nute make up as above. #3 leaves are drooping a little, I’m hoping it’s just transplant shock and she’ll recover shortly. I’ll be increasing my nute strength next feed and finding a way to add calMag with what I can find locally.
 

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boo

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in my opinion those plants are plenty big enough to take stronger nutes and cal mag...they are way too yellow...savable plants but don't delay feeding them...
 

Greengal

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in my opinion those plants are plenty big enough to take stronger nutes and cal mag...they are way too yellow...savable plants but don't delay feeding them...
Ok thank boo. I’ve been reading up more nutes and promix and I think you’re right. What are your thoughts on watering them? More specifically avoiding overwatering. I try to wait until the soil feels pretty dry but it seems too infrequent that I actually water them.
 

boo

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I use pro mix, have been for 22 years, that's all I know...look into GH 3 part nute system and add calmag...I water to saturation, letting my plants get pretty dry in between feedings...makes the roots stretch more giving the plant the ability to ingest more food...if the plant feels heavy when you lift it wait until it's drier, never over water the plant, it prefers to dry out more than most plants...
 

Greengal

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Wicked thanks for the tips. I am using GH micro flora and fro, and waiting to get my hands on some Cali magic. I just gave them a good soak of 1/2 tsp micro, 1/2 tsp gro and 1/8 tsp bloom per gal. I’m using a feeding guide I found on the internet for the portions, but I’m not really following the weekly bit cause I had a slow start with them. Treating them as first week of veg now any feedback on that?
 

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boo

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yeah, I'd hammer them and give them something to eat...I use 5 ml. of bloom, 10 ml. of micro and 15 ml. of grow plus 5 ml. of calmag per gallon one the cuts have fully rooted...watch the green explode...
 

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Another update... used your recommendation on nute strength a couple dates ago boo and removed the Lower dead leaves. I think they’re looking better?
 

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