Indoors
Mendel’s
Autos
Tap water 7.2 PPM 140
Water solution Ph to 6.5-6,8 PPM in the 700’s
Soil FFHF with 30% perlite. Added lime and epsom salts
General hydroponics 3 part.
LED Spiderfarmer SF4000
Temps Day 78-80 night 70-71
RH kept proper followed schedule
I have a humidifier and heater
I have 2 intake vents and I vent the tent outside.
Have a bag of Exhale in tent
2 years
Last time, my 4th grow, I did a photo. I kept this plant growing nicely to it’s fruition. Leaves stayed a nice color the whole grow, very little issues. Next winter I’ll do it again. I got an A+ for that grow from friends.
I started another auto about 60 days ago. Mendel Purple Haze and Wedding Cookies. The seeds germinated well and started to grow nicely.
I understood from the past that I didn’t need to use nutes in the beginning and I fed only Ph water, some Mammoth P and Cal mag until the PPM runoff was about 200. The plants looked great up this this point. So once I hit a low PPM I decided to adds some nutes. I added nutes about 3 times. I fed to runoff and the numbers were set in the 700-800 range each time. That’s good.
Suddenly, like every auto, the leaves started to get brown spots.
I looked for what def it was by the pics on the internet. I added some epsom and manganese. I continued to water with nutes. It went from one plant to the next to the next. I had one plant that was still green and looking good. Then suddenly the day before yesterday I woke up to the plants leaves browning.
Now the leaves on all the plants are browning badly. The budds look ok. Here’s some pics of my plants.
I’m going to ride them till the end. This happened before and in the end all was fine with the product. According to my friends.
So is this just an auto thing? Does everyone experience this with autos. I am flummoxed some.
Here’s photo’s of my plants take a look. Offer a tip. Please.
I don’t have a lot of auto experience but based on just the pictures I would have done what you did to try to correct the issue… I think I see some foxtails and my limited experience with autos is they can get stressed easily…
You have a potassium deficiency in my opinion, It’s recognized by the brown spots. Potassium deficiencies causes the internal temperature of foliage to climb, beyond 104 and it will cause protein in cells to burn and degrade.This forces up to 70% of your plants energy to be burned to keep cool.
You have already described having a Magnesium deficiency, so it sounds as though you are underfeeding micronutrients or have a pH lockout where it can’t absorb the nutes.
I would test my runoff with a plain water feed after I check my PH and adjust water to your substrates ideal pH. If everything is out of whack, flush it, then refeed.
What type of wattage are you running and how close are your lights?
What’s the average temp of your tent at canopy level?
My Ph has been fine the whole grow. I’ve been checking. In the past it was low, this time perfect.
Potassium? Hmm? I don’t think that could be possible. I’ve been hitting the bloom hard and even added some Florabloom. I thought I added enough PK?
Not magnesium. I’ve been adding cal-mag since the beginning.
Manganese. A few grows ago this nute came up as being an issue, same problem.
I had PPM numbers and it seemed like they were eating, till I used nutes.
I flushed the plants on Thursday. With Florakleen.
SF4000. Not close. Still 22-25 inches away.
Temp at canopy was, early on 75-77, it was winter. Now temps 80-82. Humidity is being followed closely and I’m using the schedule for Rh %.
Run off PPMS seem a little low for flower 1000-1100, 1st impression is nitrogen, potassium and phosphorus deficiency. If those are recent run off numbers I would feed your base nutrients with some added calcium and magnesium
Im leaning its a P or K deficiency myself. At this stage, bud development is in overdrive and she needs PK by the bucketful.
Id triple check pH is in range. If it is, simply increasing the bloom based nutes and maybe a dab more calmag (the K deficiency resembles Calcium def usually, so I always approach both)
Or this. P or K. One looks like a banana. Yellowing with spots, and I always associate it with a K def. may have that backwards to be honest
Plants nutrient requirements change throughout the grow. I go from a heavy 5-1-1 feed to a heavy 0-15-15 with a splash of 5-1-1 between late veg and early flower.
It could be none of the above. Those leaves you just posted appear to have some type of fungus, leaf septoria if I had to guess. Your problem may not be nutes.
Check all your plant for insects like spider mites as well. I can’t count the times here where they were the underlying problem.
My opinion is calcium toxicity, i think i read you added lime, then cal mag. Calcium will lock out magnesium and potassium and plants will show signs of those Leaves dry up have red spots. This looked really familiar, i just troubleshot this myself and thought it was mag and potassium. I raised PH just trying and it got better, but calcium is less soluble in water at 6.2 than it is at 5.8, and in my case the entire time it was to much calcium.
Thanks. Interesting. That is a new opinion, I appreciate taking the time.
Been showing and talking about these plants across the nation, lol. Everyone has a different opinion.
Some say it’s the Siberian genetics used.
I really kept an eye on these plants. The sudden change got me. One day they are all green and growing nicely. PPMs fine, maybe low. Ph perfect each runoff test. Then within 4-5 days they changed one by one for no apparent reason. The budds are still growing???
This is not my plant. But it’s the same genetics. I can find several pics that look the same way.
Could be the genetics. Leaves get yellow. I still have some leaves left HMMM?
I read through your thread and I will offer a few bits also.
If you were closer to harvest, I would not concern myself, but yours look to have weeks to go. When they reach end of life, they can look bad. But I did grow mine well past their “harvest by” dates, so that accounts for a lot of that.
I think it is possible what @Jarlax said - consider toxicity or lockout.
Also, if you only have one pH meter, get another. I recently ended up with three different pH meters of two types and the range was 1.0 between the three. Watch out for lying instruments.
I have no experience with bacteria or virus, but certainly investigate that as @2GreenThumbs suggested.
One more thing you can try for fun. I take it you are in soil, so try laying flat on the soil a raw slice of potato for a while, then pick it up and see how many critters are on it. Might be scary.
Good luck! I understand your frustration. It is tough.
