Guide for Diagnosing Plant Problems

Super Toker

Active Member
my plant is green except where the buds are starting and they are turning a lil yellow. I give it nitrogen and phosphorus and they are still a lil yellow. Anybody have an Idea what I need ??
 

bigtimber

Member
I have some brown spots like i saw above, i do supplement cal mag but not till after they showed up. i saw some pics in cannabis grow bible and it looks like manganese def also. but i try not to worry about the plants too much. i also had spidermites (hopefully had... and not have) the first week of flower. I battled and im on the offensive.

these spots could be residual damage from them or from my hot pepper/garlic or neem treatments too. Im not going to spray foilage anymore with neem cause im further into flower than i want for putting stuff on the buds... anyone have any thoughts on what this might be or might have been? the leaf is cut because its a leaf from a fim cut two weeks ago.

these plants are 29 days old, coco #10 pots those are 4' t8 that are on and giving us perspective on size. the hps is off for pics. any input is great! thanks. seems like new growth isnt affected anymore but i do find big dark fan leaves with these spots. usually i pull them if they are out of the way or in canopy. seems like problem has stopped and i just read above that brown spots dont go away once they show up. this is my first grow and so far has been a lot of fun. Now i have been an avid tomato, garlic, onion and hot pepper gardener for several years so i had most of the stuff to get me started. I am using some fox farm nutes at low doses and mostly just listen to the plants. i think the leaf curl which is so slight could be from the neem treatments but like i said i have no experience so hopefully this information helps someone else or one of you may help me. cheers! View attachment 2515236View attachment 2515241View attachment 2515242DSCF5305.jpgDSCF5311.jpgDSCF5313.jpgDSCF5314.jpg
 

It'sAllGood

Member
I came across this neat little list that can probably help a lot of people out. If you like it check my post in the General area...I need some help!

Quick Deficiency Guide

Nitrogen: Entire plant is light green in color; lower leaves are yellow; growth is stunted....

Phosphorous: Entire plant is bluish-green, often developing a red or purpleish cast; lower leaves may be yellow, drying to a greenish-brown to black color; growth may be stunted...

Potassium: Leaves have a papery appearance; dead areas along the edges of leaves; growth is stunted...

Magnesium: Lower leaves turn yellow along the tips and margin and between the veins; the lower leaves wilt...

Calcium: Young stems and new leaves die...

Zinc: Leaf tissue between the veins is lighter in color; yellowed; papery in appearance...

Iron: Leaf tissue appears yellow, while the veins remain green...

Copper: Leaf edges appear dark green or blue; leaf edges curl upward; young leaves permanently wilt...

Sulfur: Young leaves turn pale green, while the older leaves remain green; plant is stunted and spindly...

Mananese: Growth is stunted; lower leaves have a checkered pattern of yellow and green...

Molybdenum: Leaves are stunted, pale green, and malformed...

Boron: Young leaves are scorched at tips and margins...
Can anyone tell me what's wrong please...
Her leaves started to yellow on bottom like 2 days ago.
She is about 2 weeks from planting. The soil is Miracle Gro 'Garden Soil" with peet moss, and 30% perlite. My temps are steady at 75, and I'm using CFLs
I only water about once every 6 to 8 days when soil is dry, and I haven't given any nutrients, and I have 26w CFLs 4 of them within inches of her. Like 2 inches..I've read on google that it could be my tap water and something about the ph but I let the water sit out for like 4 or 5 days b4 I use it...?????

According to this guide, my problem is "Magnesium: Lower leaves turn yellow along the tips and margin and between the veins; the lower leaves wilt..."
is this right?? here's her picture. The first pic is w/a flash, the second w/o flash, the third is a close-up w/o flash..Please help my baby!!! And thanks in advance.

001.jpg002.jpglittle one.jpg
 

desertdog

Well-Known Member
this is great info, however pics help newbies nail down problems and fix before plants die. Yes I am speaking from experience and because of the pictures I did exactly what was needed and saved most of my babies.
 

grower4real

Member
i need some links to autoflower grow guides cuz ive had prblems and you guys have helped(thanks by the way) but just wanna get as much knowledge as possible
 

sidewinda

Member
mmmm....yellowing bottom leafs, tip burn on leaf tip, curled dark green new growth....plant 4 week old, soil, temps 26/15 night, late moving from small pot, ph 6.6, 6.500 clfs. I am a little worried cos the last died.. the salts took the ph off to 7.9, so no boron for that one....gggrrr. Just kinda reminded me that i dont wanna waste anymore....feels like waiting ages then it all goes tits up...

id appreciate the help.....:wall:
 

rastafan

Member
i need some help whit my plants,they are 6 weeks old veg period i use 4-65cfl lamp and 1-400w hps,i grow them in a beach shelter 2per3 M,i buy the seed from duch seeds,they germinate all,the soil i use is bad,is gest basic flower soil,perlite and building sand,i feed them whit tnt complex npk 3-3-3 only,last 2 weeks i lose may hps lamp,and i put insted 500 ml lamp but it's less then half lumens that hps,my plant look realy bed after 6 weeks,they are skiny few branches,and only main stem developed some way.
i am a beginer so all point of wiew are considerd,i some one may help,pleaseIMG_5133.jpgIMG_5135.jpgIMG_512645444444.jpgIMG_5131.jpg
 

JarQa

New Member
Do you definitely HAVE to feed your plants? sorry if this is a stupid question, mine seem to be doing fine without, although the lack of sun lately hasnt helped lol..
 

Hash Lover

Well-Known Member
Do you definitely HAVE to feed your plants? sorry if this is a stupid question, mine seem to be doing fine without, although the lack of sun lately hasnt helped lol..
I assume your in soil, but it depends on whats in the soil and how long they are in there. If you want to try for the best harvest you can have, I would say yes you do have to feed them. They inside ? Outside ? Since you mention sun I am guessing your outside.
 

Mrimpala

New Member
Outdoor, 25 gallon grow bags, have fed them nutrients pretty regularly. Looks like they need water every 2-3 days( hopefully that's not too much)
Feeding them Flora nova bloom right now..
They look pretty healthy. 4 different strains..
except for the big shade leaves on the inside.. Their turning yellow and look weak...should I remove them?
This is our first attempt and were green as can be....
We've also been loosing quiet a few of the lower branches .. Their breaking at the main stock..
any help is app.
 

BassTastic

Active Member
i believe my plants need potassium, bottom leaves are wilting and some die, and i feel as though the plants should be bigger at this stage in my grow, how can i fix this potassium problem before its time to flower?
 

Killa Cain

New Member
Who can tell me what's wrong wit my 2 week old plant the leaves are drooping down and the bottom leaves are yellowing can any one help
 
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