Guide for Diagnosing Plant Problems

What do you all think the blackish marking are on these leaves?
Do i need to be worried?

shenegan excellent link for plant problems thanks much

those happen when its cold out. i had a plant turn 90% purple/black when it was 50 degrees out. you can also see that its cold cuz P is getting clotted in the skinny stems. this is completely normal dont worry

when it gets hot the P gets un clotted. my plants do this all winter and then i get one hot day and the P just slowly eases away

my branches are going a bit purpley pink in colour, near the end of flowering now. sure i seen somewhere what the deficiency was but damned if i can see it... any ideas?

phosphorous!!

this are my plants, can anyone help me

Hey, i need some help, this is my first time grow. it been growing good untill i noticed that a few of the bottom leaves started to get brown spots on the tips, very small but then as time went on it dried out the leaf and turned it yellow and crackly. The top portion of the plant seems healthy. is this nute burn? or something else. please lemme no so i can do something to fix it asap. Anything helps. Thanks

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Hey, i need some help, this is my first time grow. it been growing good untill i noticed that a few of the bottom leaves started to get brown spots on the tips, very small but then as time went on it dried out the leaf and turned it yellow and crackly. The top portion of the plant seems healthy. is this nute burn? or something else. please lemme no so i can do something to fix it asap. Anything helps. Thanks

some advise please, I burnt them last week for about a day it was off, but now the leaves are making hard curled edges and the leaf almost makes a bowl shape and the inside of the leaf has specks on it. I'll post a better picture in a sec.

here are some better pics

hey all can yall check out my pics here and give me your opinons on whats going on? https://www.rollitup.org/marijuana-plant-problems/460675-first-grow-plant-problems-pics.html

here are some better pics ​

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pic 1 = K deficiency; leaf tips are all singed. when it gets worse the leaves will get a permanent under curl.
pic 2 = Maganese deficiency; leafs trying to close up(severe canoeing) & K deficiency.

i bet you have to pour water through those hydra whatever you call it rocks. those rocks are clay, clay absorbs N and K. is this hydro, if its not toss those rocks??

you gotta folair feed with 1/5 strength nutes when the lights aren't on

This leaf comes from a plant 10 weeks old--3'. Has developed about two-or three of these. Plants are inside grow room in Miracle Grow soil with Oscmocote. I have been giving them a supplement of seed weed extract and molasses the past 2 weeks. They are under 400watt HPS (just begun flowering) with 400 watts of supplemental grow flourescents in a 5'x5' room

pbonard said:

This leaf comes from a plant 10 weeks old--3'. Has developed about two-or three of these. Plants are inside grow room in Miracle Grow soil with Oscmocote. I have been giving them a supplement of seed weed extract and molasses the past 2 weeks. They are under 400watt HPS (just begun flowering) with 400 watts of supplemental grow flourescents in a 5'x5' roomView attachment 1772688

Click to expand...

it could possibly be a nutrient problem....i would look into that

pbonard said:

This leaf comes from a plant 10 weeks old--3'. Has developed about two-or three of these. Plants are inside grow room in Miracle Grow soil with Oscmocote. I have been giving them a supplement of seed weed extract and molasses the past 2 weeks. They are under 400watt HPS (just begun flowering) with 400 watts of supplemental grow flourescents in a 5'x5' roomView attachment 1772688

Click to expand...

If you are using miracle grow soil that alone might be your problem. Miracle Grow leads directly to nutrient lock! I wouldn't even recommend miracle grow on any level. I think you would have better success using anything else imo. I've heard the bags of mushroom compost at homedepot work well if u r on a budget

Theyre in coco under a 250w air cooled hood. About a month old 5.8ph, nutes at 600ppm + 50-100ppm of calmag. temperature is fine. Any ideas on the problems? the first 3 pics are of one plant the last 2 are of another plant.. i dont think its the same problem since the spots dont look alike.

does bud rot affect only the bud its on or whole plant