Urgent! Black Cream and Dark Devil nut deficiency

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Hi! I`ve been reading the forum for a while but this is my first post. It`s my first grow, running 2 Black Cream and 1 Dark Devil and at the last 3 weeks the plants have shown different signals of nutrient defficiency and nut burn, I think. I`ve tried to deal with the problems but as the time passed the things went worse, so here I am asking for some good advice from you, to save my plants! By the way, I must say I`m very glad about this amazing forum! It provided me lots of information and the most important tips for growing these fascinating plants. Congrats for the team and all the members that make this happen! Unfortunatelly, I had no time to make journal but when I harvest, I`ll write a review and give my contribution.

Problem:
Leaf tips turned down, numerous small white spots at few bud leaves, big white spots at fan leaf at week 5 in Dark Devil. Purple fan leaves at week 5 in Black Cream. The plants are at week 8 now and the problems got worse.

Medium:
Coco.

Feed:
I`m using nuts for Orquids. I use these on my orquids for years and didn`t want spend more money with nuts. Both veg and flowering have all macro and micro nutrients and I trust them a lot. Watering is ok, I just water every 2-3 days and let them dry out a bit. More information at Additional Info.

Strain:
1 Dark Devil (Week 8) and 2 Black Cream (Weeks 8 and 7)

Climate:
Temps: 28C Day and 25C Night. Humidity: 50%. Light: LED.

Additional info:
During vegetation I`ve feeded the plants 3 times with 1/8, 1/5 and 1/4 at weeks 2, 3, 4. At week 4 I also introduced the flowering nuts at 1/8 strength. At week 5 the plants were flowering great but leaf tips turned down a little bit and the first small white spots showed up in a few bud leaves in Dark Devil. Two days later, big spots appeared in a fan leaf of DD and a fan leaf of Black Cream 1 started to show purplish tones (probably due to phosphorous defficiency?). Util this point I hadn`t a pH meter, so I bought it. I realized that the soil pH was too low, about 5,2. So I flushed and gave a 1/4 flowering nut. At week 6, different small spots, with orange borders, appeared at Dark Devil fan leaves (calcium def?). So, at the end of week 6, I feeded with a full flowering strength (5mL/L) and Calcium 1 mL/L. I did it by mistake, just wanted to give it a 1/2 nut, but I decided wait and see what happen. And... the leaf tips started to yellow at week 7. Than, at the end of week 7 I flushed again and used the method described here at the infirmry to calculate the soil pH. It was low again, pH 5,2. I realized that at the first time I didn`t flushed it enough. But at this time I did it correctly and calculated pH 6,6. A little high but I was happy with it. The run off EC was 5900. I feeded again with 1/8 flower and Calcium 1mL/L. But now, in the middle of week eight, the plant got worse, the tips of sugar leaves became more yellow in Dark Devil and the fan leaves became purple. And at Black Cream the fan leaves became more purple and yellow. I know harvesting time is comming but these leaf problems are clearly due to defficiency for me. The buds are looking amazing and growing every day and I want to keep good conditions until the end.

These strains produced quite dwarf plants. Obviously my lack of experience didn`t help but the bad genetics are clear. On the other hand, these buds are freaking awsome!!! The colors, the resin production and the smell are amazing. For sure I`m gonna get the best weed i`ve ever smoked, but with very low yelds. I`ve seen a description that Dark Devil was just an stunted bud and it was right.

I`m growing 1 Dark Devil and 1 Black Cream at the same age, and 1 Black Cream 1 week younger. I was lucky because the younger Black Cream has the best pheno of the three plants and is growing very healthy until now. This lapse of 1 week between them was enough to learn with the mistakes I made with the first two and give better conditions to the the third one. It`s genetics was better since the beggining and the better treatment produced a taller and stronger plant. This third plant is now my only chance to get a reasonable yeld so I`d like to understand what tha fuck is going on with the first 2 and get fat buds from the third!

Pictures below. The pictures inside the growbox were taken today.

The Black Cream 2 is beggining to show leaf tips turn down. Advices please!

Thanks!
 
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Black Cream 2
 

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silly question bro, but what are they in? have they got good drainage? swollen leaves indicate too wet, first thing I noticed. They might feel dry but what about the bottom, are you using a moisture probe to check and are they sitting in their drainage, or drinking it?

the colours are amazing tho bro. seriously, its normal and top job for getting those colours on such bonsai plants. lovely.
Hats off for growing orchids aswell dude, love the monkey face ones myself, plan to grow a few under leds, see what they do.
Anyway,,,back to your plants, I suspect poor drainage, you sound like you got good control over your feeds, ph levels, etc.. so I aint gonna patronise you by going through all that jazz,,,but I will say that the simplest things are often the most overlooked. start from there bro, air circulation, ventilation, drainage etc..
 
Time to chop them down and start again, at 8 weeks with how stunted they are and how many leaves have already been affected you aren't going to turn these around. Quickest, easiest solution is to dry those girls out and enjoy the smoke while you let your next crop grow. Tang's got a great simple feed schedule for autoflowers in the fertilizer section of the forum, not sure about the orquid food though, you could probably make it work, but being stingy on the nutes will rarely get you anywhere. A little money on your setup and feed goes a long, just a noobs 2 cents, good luck sir.
 
LEDBorg,
The drainage is OK and the pots are not sitting at the runoff. I believe the leaf tips turned down due to nute deficiency but I don't know of what nutrient.
The pH and feed are under control now but I took a while to learn how to deal with it and the plants suffered with my mistakes.
Glad to know you like orquids. The monkey face is a funny especies. If you grow nice indoor marijuana plants you'll have no problems with orquids. They're easier.

JB,
I thought about chopping them off but I want to keep it to increase the body effects and the yelds because I'll cannot grow for a few months. Thanks for the advice about Tang's feed schedule, I'll take a look.

Thank you for commenting, guys, but I still would like to get a diagnosis about these leaf signals. It will be important to prevent deficiencies on the third plant and to learn for the next grows. Today I feeded the plants with 1/2 flowering and full calcium.

Does anyone have a clue about what are these leaf signals?
 
I see signs of calmag def (brown spots, decoloration, etc) especially in the dark devil. What lighting and wattage are you using? I stunted a Think Different once due to excess nutes and water the first 2-3 weeks, that's the critical time for autos. Anyway I got some 5 gr of decent weed LOL!
 
Thanks Bushdktr,
I'm using diy LED lights 14 W for each plant. I put the lights close to the plants like CFL growing. You can see it at pictures BCr6 or BC4. At the first week I got some light burn at Dark Devil and Black Cream 1 because the lights were too close. I wanted to avoid the plants to stretch too much cause my growbox is just 60 cm/2 feet high. Maybe this light burn increased the stunting. With the Black Cream 2 I had already learned the correct distance for the lights and didn't burned it. Its buds are growing and swelling very well now. I cantora wait to taste these Buds!!!

What you think about the purplish leaves and turned down leaf tips? Might be phosphorous and nitrogen def???
 
Could be some other deficiencies yeah, prolly N and P, anyway stunted girls do look weird, and leaves turn rough and thick. Don't have experience with those LEDs but they are probably insufficient light, even in a small grow box
 
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