Sick Dark Devil in coco/pearlite

[HeistGoneWrong]

Hey guys, hoping someone might be able to help diagnose this plant. It's one of 3 plants in a 4x4 tent. The other 2 are doing fine.

Lights are on 18/6 - 400w COB. Only have veg switch on right now
Temps have been between 70° and 80°
RH between 50% and 60% (had humidifier running while they were seedlings and RH was 65%)

It's in 3gal coco/pearlite. Watering every day with RO, 1/4 strength canna A/B and some cal-mag+. PH 5.8 - 6.0. Watering until ~20% runoff. At the beginning I did have the light a bit too close, but I remedied that pretty quickly. At this point I'm not sure if it's even worth keeping, but I'd still like to try and get to the bottom of what happened so I can learn from this.



These pictures were taken yesterday, day 12 since sprout.

For comparison, here are the other two. A Sweet Gelato and Cheese.

 

[Djamiryo]

hello mate.back off with N on that plant.it has N abundance,looks sensitive to Nitrogene.I have a plant which had the same thing at almost that stage.Using half dose of N formula of what I used in first week.It helped.Look that clawing at tips,it's a sign of N abundance.and its darker than other two,it also makes leaves tighter when excess levels of N in it..That's what I see but definitely let it grow.Don't cut it down please.This is not something serious.Good luck mate

 

[Epicxr]

Get yourself a ppm metre to measure to feed, some girls are just more fussy then others

 

[HeistGoneWrong]

@tooghetto Thank you! I keep a running log, just a bullet point list of stuff, and on Nov. 2nd I asked myself if maybe this was N toxicity. Would it be beneficial to flush for a couple days?

• Nov. 2nd
  • DD still looking stressed
  • I wonder if maybe the cal-mag+ in addition to A/B is causing a nitrogen toxicity? cal-mag+ is 2-0-0 and A+B 5-4-3 (A 4-0-1, B 1-4-2)
  • Mixed 6L of water with 8ml A/B, no cal-mag

@Epicxr It's on the list. Should have it some time this week.

 

[Djamiryo]

@tooghetto Thank you! I keep a running log, just a bullet point list of stuff, and on Nov. 2nd I asked myself if maybe this was N toxicity. Would it be beneficial to flush for a couple days?



@Epicxr It's on the list. Should have it some time this week.

If you think you didn't give it a lot of nutrients,only half or quarter dosage of what's on the bottle,then I wouldn't flush.Just decrease your base nutrient including N mostly(A probably).or skip A for 2 feedings.You can give B at same dosage or even decrease it as well but I keep giving B at same amount.I don't think calmag would do that to your plant. That A labeled bottle should already have some calcium in it but any calmag addition is beneficial.keep giving.

In case of flushing,since it's only 2 weeks old,don't use lots of water.If you give 1ml every day for ex. 3-5lt would do the job.And flush only for once,no couple of days.Flush first,then add feeding water.

As Epicxr dude said , some plants are more fussy and they'll always show signs like this one.Just try to control it and everything will be fine.Especially plants that are sensitive to N will show that clawing sign no matter what you do.But it's not a big problem,decrease N amounts in feeding and you'll be fine.

 

[HeistGoneWrong]

@tooghetto thanks again, you make some very good points. The bottle calls for 40ml per 10L (4ml per litre). I was mixing roughly 1.33ml per litre. I'll mix up a batch special for DD and skip out on the A for a couple feedings and then slowly start adding it back in once she tells me she's feeling better.

 

[HeistGoneWrong]

It's been a couple days. Wednesday and Thursday I brewed her up her own feed and left out the Canna A. She doesn't really look any better, maybe a bit better on some of the new growth. This morning I ran a litre of PH'd RO water through her instead, and this afternoon I received my PPM meter. I decided what the hell, and ran another litre of RO water through her tonight a couple hours after lights on. Runoff was ~800 PPM. That seems pretty fucking high. I had high hopes of being able to save her but not so sure now. I have room for one more plant, so I think I'll just pop another bean in anticipation of the worst case scenario.

 

[bushmasterar15]

I run in autopots with coco but did follow same type schedule when I did run a couple extra in fabric pots. With giving feed everyday during the beginning their not getting a chance to establish a solid root base. In the fabric pots I didn't water till runoff when just starting out and once at the 20 day mark is when I was feeding every other day till runoff and let them soak that up from the tray.

This is the schedule I do use for the Megacrop on my grows when using just their product. I had little change up of nutes when I was testing the Greenlife Biotics MC & Bloom P/K 0-17-17.
Megacrop 9.7-5.5-14
Sweet Candy
Redline is 1-5-4
Mother Monarch is 0-52-32

I use Canna Coco bricks so my precharge to rehydrate is 2 grams Megacrop , 1 gram Sweet Candy, 8mls Earth Juice Oily Cann Calmag per gallon. It will take almost 4 gallons to make up their package of 40L brick. Then before I place germed seed into pot each pot get's 1.5L of the same nutes.
Day 5 from sprout they get 500mls same nutes
Day 10 750ml-1L same nutes
Day 15 1L same nutes and turn on airdomes if you have them
Day 20 mixed up 5 gallons of same nutes for the reservoir and turned on and final top water of about 1L each from the res to make sure the pots were evenly saturated and start drawing from the tray.
Day 30 filled reservoir with Megacrop 3 grams, 1.2 grams Sweet Candy, 8mls OilyCann Calmag per gallon, 1ml DripClean per 10 Liters
Day 40 @ 4g Megacrop and 1.2g Sweet Candy, 8mls OilyCann Calmag can start adding Redline 1.2 grams per gallon, 1ml DripClean per 10 Liters
Day 50 @ 4g Megacrop and 1.2g Sweet Candy, 8mls OilyCann Calmag, 1.2 grams Redline, 0.5 grams Mother Monarch per gallon, 1ml DripClean per 10 Liters
Same till the end of grow or can drop Megacrop to 3 grams per gallon final 2-3 weeks.

 

[Waira]

- Heist', has she had those funky crinkled surface texture on the leaves all along? Brittle too? .... It sure looks it, and if so, I recognize this mutation... it's actually not that uncommon... The pissy nute sensitivity seems to be an associated co-symptom that often pairs with it; I had a photo last season that did this exact same thing... I let her run anyway, but performance was inferior, always super nute sensitive... she did make some nice bud in the end though, but yields as expected were lousy... For all the advise here, Arthur has you covered, but this mutie is permanent... keep her or rip it out and start a new seed...

 

[HeistGoneWrong]

Thanks @Waira

Looking back through photos, you're right. It had been like this all along. she always looked kinda dry and crinkled. I did end up ripping her out earlier this week. I just got back from some business out of town, and my other two girls are looking amazing. I was thinking I might start two more dark devils, but maybe I should just concentrate on my two other plants that are thriving.