Leaf Problems

[epicseeds]

Strain: Kandy Kush (OG Kush x Trainwreck)
Medium: Coco
Nutes: 25ml PBP, 10ml Liquid Karma, 2ml Silica Blast, 2-10ml CalMag, weekly 10ml Humic Acid
Temp: 75-80F
RH: ~45


I have been combating taco leafs for the past month or so, and really don't know whats causing it. Granted, it was way worse but still persistent. I have made sure temps are not a problem, I have added CalMag, and am only watering once pots get a bit light. Other plants of different strains are flourishing very nicely.

I have never grown Kandy Kush, nor have I ever worked with OG or Trainwreck genetics. Is there anything special I should know about these strains? IE do they not like heavy feedings, frequent waterings, etc?

Any suggestions to once and for all figure this out would be much appreciated. Here are some pictures. The entire plant is not like this, but id say less than 20% are similar to pictured below.

Briefly, the fan leaves are a deep green, and look kind of waxy. The edges curl up, and the stems are a purple color. It seems to mostly occur on older, larger fan leaves.

 

[Toes.]

she didn't do that for me... although, we have a different style, you and I.

here she is... in my bat shit drenched greenshanty... not so big... yet, no purple petioles. whatever is going on, i'm hopeful it's not genetics.

what's the silica for? i've gotta ask because, i don't use it... and, iwonder if I should start. i've read where it's good for high temp grows because it makes cell structures stronger. these guys were facing 95* + conditions and the silica was the secret weapon...

while were talking about things for me to try... the 6500k always makes my plants look different. a 5000k might not make 'em so dark green... what i want to know is... how to get those top-shelf, indoor, dro nodules to grow in a bacteria, feces and fungus powered, love-shack... is my question.

 

[epicseeds]

what's the silica for? i've gotta ask because, i don't use it... and, iwonder if I should start. i've read where it's good for high temp grows because it makes cell structures stronger. these guys were facing 95* + conditions and the silica was the secret weapon...

Silica will:
+ Increased stem strength and rigidity - once silica is taken up by the roots, it is deposited in the plant’s cell walls as a solid silica matrix equivalent to quartz. This structure produces stronger and more rigid cell walls and hence a ‘mechanically’ stronger plant. This enables better leaf orientation for receiving light which in turn enhances photosynthesis and growth rates.

+ Improved healing of pruning wounds - silica enables pruning wounds to heal more quickly and neatly. This property is especially beneficial in commercial cropping of plants such as tomato and cucumber where regular pruning threatens the plant's survival.+ Increased fruit weight - accumulation of silica in plant cells can result in higher fruit weight.

+ Increased leaf strength - improved resistance to wilting, particularly noticeable during hot weather.

+ Increased tolerance to high salinity - silica has been shown to reduce problems arising from nutrient toxicity (e.g. sodium, chloride) and/or imbalance.

After thinking about it, perhaps my plant is experiencing high amounts of Silica? I wonder what the symptoms are. I have only been using the silica once a week or so, and at low doses.

while were talking about things for me to try... the 6500k always makes my plants look different. a 5000k might not make 'em so dark green... what i want to know is... how to get those top-shelf, indoor, dro nodules to grow in a bacteria, feces and fungus powered, love-shack... is my question.

I am assuming when you say 6500K,5000k you are talking about CFLs? The only way you are going to get the best results is if you use HID lights. I prefer HPS for Veg and Flower.

 

[Scrogerman]

Silica is excellent stuff!

Ive had this margin serration cupping, water/moisture stress i believe, id look at your enviroment & irrigation.
Heat stress is similar.

do you have fans blowing right at the plants? seems you have heat stress in the last pic, the leaf margins curling right over/in like that?

Ive only had it in soil grows! i havent had it in hydro!

http://how-to-grow-cannabis.info/grow/growing/marijuana-cannabis-growers-almanac-FAQ-1331.html

G'Luck!

 

[epicseeds]

Silica is excellent stuff!

Ive had this margin serration cupping, water/moisture stress i believe, id look at your enviroment & irrigation.
Heat stress is similar.

Temps and RH are good, only thing that could possibly be causing trouble the fact that I have no fresh oxygen coming into the room. The rooms is large though, 18x20 ft 11ft tall. I have no intake/outtake but I have been keeping the door open for a few hours a day. I would think that is enough oxygen for 3 plants? Also, the other 2 plants are flourishing, yet they are different strains.

do you have fans blowing right at the plants? seems you have heat stress in the last pic, the leaf margins curling right over/in like that?

No only oscillating fan on low. With a box fan on the opposite corner of the room on low to circulate air around.

 

[Scrogerman]

Its water/moisture stress like i said bro! look at irrigation, moisture in ya medium, i have to have fresh air pulled in either passively or actively, plants use up Co2 pretty quick & they need it to flourish, your lucky you have such a big room really, id still want passive intake on that myself. id hook a hole straight into cavity wall-inlet one side, exhaust the other, or use Co2 etc instead of making holes.

do you think its something else?

g'luck!