Leaf Burn Issue, Please Take a Look at the Photos and Share Your Thoughts

Well, I just typed out long and detail explaination of everything abou these plants from the time they sprouted, but then, for some reason, it was all erased... It drives me nuts... So, Im going to keep this brief for now.

Im using 1 part vermiculite to 3 parts canna coco as my substrate and for feeding I am using distilled water with Canna Nutes, part A and B, and Rhizotonic; then four ago I added botanicare Cal-Mag and Superthrive to the feeding formula mix. As a foliar spray I'm using 1ml super-thrive to 1ml wet betty per liter of distilled water. I use distilled water for both the feeding solution and foliar spray, so that I know exactly what's I'm giving them.

The nutrient ratio is:
2 parts Canna A
2 parts Canna B
6 parts Canna Rhizotonic
.5 parts Botanicare Cal-mag
.5 parts Superthrive

The first three days after the leaved popped up, I gave them crystal geyser water that was ph'd to 5.6, then I went up to 350ppm with Canna A and B, and Rhizo. Then after a week of that I increased the nutes and added the Cal-Mag and Superthrive. My first Ph meter broke, and the ph was a bit low for a couple days and I think that's what started the burn, but I flushed them with 2 gallons of straight distilled water, got a new ph meter and started back up with the nutes at 650ppm with the above described ratio.

Both plants were started from seed. The larger plant on the right is about 20 days old, and the smaller plant was germinated three days later and it 17 days old. The smaller one was started later because one of the 2 initial seeds didn't sprout. These are Tahoe Kush x OG feminized seeds (atleast that's what I was told as I paid $10 per seed. They are guarenteed and that's why I only started two. When I told the guy what happened, he replaced the seed and gave me two extra to make up for the inconvenience), so anyway, I can't wait for the results, but I need some advice to help me get there.












Thank you in advance for your time and thought!

You are Mag Def and your PH should be higher mid t high 6's Do not spray Superthrive Get some seaweed extract. Have you seen this thread https://www.rollitup.org/general-marijuana-growing/225396-official-canna-coco-nutrients-thread.html

Do some research on them I am sure you will find the answer there.

Looks to me like a super-thrive effect possibly, or maybe a nutrient deficiency. Just water for a week striaght of water and see whats good.

I use nothing but Coco in my crops. And you have to make sure to ei0ther have at least 25-35% run off when watering them or you need to give them a good flush every 7-10 days to flush out the salts from the micro cavities within the coco. Next time you water them, take a PH reading on the water that runs out the bottom of your pot or tub. Next NEVER plant two plants in the same container. If one plant get sick they both get sick. plus they will fight for space to spread their roots. Let me know what you nutrient mix PH is when you feed and then what the run off is.

Also, I never foiler feed either. I see what looks like salt deposits on yoru leafs, but maybe I am wrong. I have seen to many problems caused by spraying nutirnts on plants. The way i figure it, When it rains in nature, nutrients are not falling out of the sky.

Also, Isn't superthrive like Ultra strong? Like 2-3 drops per liter or gallon or something?

they do look like nutrient burns, and I don't say that quite often! but you say you flushed. could it be that your ppm is too high for plants this size?

then again, your new growth is not burned so it's probably older damage.

I say still, take it easy on the ppm, and focus on trying to balance the chemistry there. your mag deficiency could also be because of calcium toxicity.

adding more ppm does not make your plant eat more.

When I grew in deep water culture, I used to spray them like crazy, and never had any leaf burn, but maybe it's different with the coco. I don't know... Coco is new to me. I have been following this feeding guide that the guy at the hydro shop gave me and I have actually been using significantly less than what the chart says to use. I will flush tonight with ph 7 distilled water and take a reading of the runoff. Again, the guy at the shop told me the ph could be as low as 5.2 with the nutrients. I personally thought that sounded crazy, and I never used to go below 5.5 with my dwc setup. If anyone else has any suggestions, or something new to add, I welcome it. Thank you for the replies.

Look what happens when you listen to a hydroshop guy Read below

I also never listen to Hydro sho personel. I find a lot of their info wrong.