Can anyone help identify this leaf problem?
- Thread starter Dr. Monty
- Start date
Streetpro09
Tester
If i had to guess it would be a potassium deficiency. Check out this site, there's a lot of good info there thats well laid
www.growweedeasy.com
How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms
Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.
www.growweedeasy.com
H.A.F.
a.k.a. Rusty Nails
And if he sees a K deficiency, (I don't know that stuff by eye) I would say under-feeding at a critical point.
I only say that because it is one of the big three (NPK) - and most stuff we feed the plants has the NPK going on. If you were underfeeding and you know they weren't getting the K, then problem solved.
If it continues I would say a calmag problem or bad pH. It seems every time I had issues - all different issues - that was the base problem. Not allowing the plant to ingest stuff that is actually there, or 'lockout' because of bad soil chemistry.
Streetpro09
Tester
And if he sees a K deficiency, (I don't know that stuff by eye) I would say under-feeding at a critical point.
I only say that because it is one of the big three (NPK) - and most stuff we feed the plants has the NPK going on. If you were underfeeding and you know they weren't getting the K, then problem solved.
If it continues I would say a calmag problem or bad pH. It seems every time I had issues - all different issues - that was the base problem. Not allowing the plant to ingest stuff that is actually there, or 'lockout' because of bad soil chemistry.
Ph would be my second guess. Without knowing the history of how these plants were cared for makes it a poke in the dark either way. Hopefully we will provide enough info for the OP to make that determination themselves.
Streetpro09
Tester
Looks like they are just starting to flower? I stick with my original guess. I'm not sure i would do much other than up my feed a little? It doesn't look too bad at this point.
Could be a phosphorus deficiency. 5 picture down looks like yours.
How to fix Cannabis Phosphorus Deficiency (P) Pics & Symptoms
Phosphorus deficiencies cause dark splotches on leaves and can appear at the bottom of the plant on some of the oldest leaves. Learn to spot & fix the issue.
www.growweedeasy.com
Mr. Krinkle
Member
Probably K being locked out from too much cal-mag....are you using a cal-mag supplement? If you are, then stop using it and see what happens....are you using a base nute? if so, which one? what kinda medium are you in? brand?
but it's not a huge problem as it's only a few leaves...take those leaves off....did you just start flowering?
you're leaving a lot of info out
but it's not a huge problem as it's only a few leaves...take those leaves off....did you just start flowering?
you're leaving a lot of info out
Dr. Monty
Green Supremacist
I didn’t wanna put them in flower yet but they’re nearly 6 ft tall lol.
So I flipped them last week and slowly transitioned to flower nutes. Using heavy 16 nutes with power SI. Promix soil with good LED lights and smart pots. I actually did use Calimagic cal-mag but I ran out so I stopped lol.
I’m using the method where you only give nutes every other time and it’s been working great since I fixed the nute level.
The strain is white widow also
So I flipped them last week and slowly transitioned to flower nutes. Using heavy 16 nutes with power SI. Promix soil with good LED lights and smart pots. I actually did use Calimagic cal-mag but I ran out so I stopped lol.
I’m using the method where you only give nutes every other time and it’s been working great since I fixed the nute level.
The strain is white widow also
Mr. Krinkle
Member
ok...leave the cal-mag out for now and see if it gets any worse...
so you think they look better by alternating a feed and plain water schedule rather than feeding every time you water?
so you think they look better by alternating a feed and plain water schedule rather than feeding every time you water?
H.A.F.
a.k.a. Rusty Nails
Mr. Krinkle
Member
H.A.F.
a.k.a. Rusty Nails
I don't think you ever need "more" - just the prescribed amount. I never added extra when the little feed schedules called for it, but I use an R/O so I add back the 5ml/gl religiously. Plus Iron!
Dr. Monty
Green Supremacist
Lol the all mighty calmag. The only reason I didn’t get more is because the flower regime for heavy 16 asks for more of these 2. I might just have to play the wait and see gamethat's right - i forgot
whenever there's something wrong, they need more cal-mag
JohnFonda
Tegrity Greenthumb
Lower leaves so its mobile. Tops arent showing any signs of a major lockout of immobiles. Looks short on mg. Whether this is due to a imbalance of nutrients ph or you just need mag is step 2 if that's what it is. Are you spraying anything the leafs look like the have aloe or yucca sap on them. All the white spots internal? Mild calcium def potentially. I've locked out from too much k before that's my only personally experience with that but I've learned to read and feed accordingly. Been flying blind last couple weeks. No ec or ph testing . Just ro and known amounts of inputs.
Artisan_tek
Insanely Active Member
Something to add....Make sure you check under your leafs for bugs. I dont want to scare you but some bugs you can only see with a microscope. I had spider mites 1 time and 1 of plants looked very similiar to this.
VAHomegrown
Active Member
I have to run my Ph around 6.8 using coco based soil mixes and always run calmag due to the LED's I use. I've had the same issues before.