Please help!

[Bernie]

Problem:
I have left my plant outside at night for a couple of days and temperature has dropped to 14° celsius, it seems to me that it is suffering from something... The leaves are turning hard and cracking easily, some have broken already. It also has these yellow stains. When I left home on Friday they were healthy and showed none of these symptoms

Medium/grow method: soiless mix (coco)

Feed: and supplements used: Only water

water source: tap water (Switzerland has very good tap water)

Strain/age: Super Lemon Haze auto Triangle Seeds

light used: Outdoors

Climate: Day time around 25-30 celsius, nighttime I bring them inside, but I left them out for a couple of days due to travel

Additional info:

 

[Bernie]

Here are the photos

 

[Rev. Green Genes]

She's droppy for sure, looks like a dry coco problem at first glance. Coco has to maintain moisture or you get issues. I am not the expert on coco at all, but I seem to remember that the pH will will get wonky fast if dries out. Do you have a pH meter?

I am sure there is a method for re-wetting the pot, someone who knows better will be along today or tomorrow.

 

[namvet25]

Some older leaves will yellow and dry up on the very bottom of the plant but this is common and nothing to worry about.Coco dries out fast so she may need a good watering.Also coco doesn't contain any nutrients so if you want a heathy plant you should be using some kind of nutes along with cal/mag.

 

[Bernie]

Thank you so much for your answers guys

I came home today to this, it seems to have expanded... On my way home I stopped by the grow shop and bought organic nutes which I'm gonna start ASAP

Regarding PH meter, no, I unfortunately don't have a PH meter... Should I just in case swap to distilled water/bottled water to be safe?

Thanks for your help

 

[Waira]

...she's hurting for nutes all around, Ca especially,... straight coco is basically devoid of nutes, and you haven't been feeding at all? What brand mix is this? Coco is not a true soil and it can't be treated like it is or problems will happen every time,... you need nutes made for coco, or add Ca-Mg in, and a ton of other do's and don't for this specialized medium,... it has a lot of unusual properties in it's CEC (cation exchange capacity) that hang new growers up every time,... do some homework about coco, here and on the web... CANNA has a good site for coco info as well,.... meantime get on the right feeds ASAP!

 

[Bernie]

...she's hurting for nutes all around, Ca especially,... straight coco is basically devoid of nutes, and you haven't been feeding at all? What brand mix is this? Coco is not a true soil and it can't be treated like it is or problems will happen every time,... you need nutes made for coco, or add Ca-Mg in, and a ton of other do's and don't for this specialized medium,... it has a lot of unusual properties in it's CEC (cation exchange capacity) that hang new growers up every time,... do some homework about coco, here and on the web... CANNA has a good site for coco info as well,.... meantime get on the right feeds ASAP!

Thanks for your answer Waira, very helpful!

I'm using Atami's bi-grow mix ( https://www.atami.com/en_gb/bi-growmix.html )

I did read about coco's need for nutrition, but didn't think it was that hardcore! I've always used soil and decided to go with coco as I read it has a great airy structure for autos to thrive but... I've been caught into the beginners mistake!

I'm feeding her with Bio-Bloom NPK 2.0-7-4 (from biobizz) since yesterday at the tune of 5ml per litre (product and dosage recommended by the grow shop guys). I'm watering a full little every 3 days (15lt pot). You recon I should still feed her extra Ca-Mg?

Any other recommendations on quantities (watering, nutes)?

Thank you so much!

 

[Waira]

use both,.. it's an "organic" line, right? No need for run-off at 15-20% then,.. that's for when using synthetics.... meantime read up on coco, there's a lot to learn regardless. If you decide to stay with coco, get a pH meter and a TDS/EC meter... soil or coco, think about getting a decent pH probe for in-pot testing... Accurate 8 is a recommended unit-

 

[Bernie]

use both,.. it's an "organic" line, right? No need for run-off at 15-20% then,.. that's for when using synthetics.... meantime read up on coco, there's a lot to learn regardless. If you decide to stay with coco, get a pH meter and a TDS/EC meter... soil or coco, think about getting a decent pH probe for in-pot testing... Accurate 8 is a recommended unit-

Thank you so much

Yes they are both organic, I'll stick with 5 + 2 per feed until fully recovered

She's definitely getting back to a healthier colour now... Slow but steady, should I leave the damaged leaves or cut everything significantly necrosed?

I'm definitely sticking with coco, I've been reading a lot these past days and will keep on reading as much as possible! Definitely a fantastic medium that looks to me like a white sheet of paper in which we can draw whichever story we want (eg we can completely pick and choose the nutrition...). Very passionate! Thinking about doing a micro indoor coco based... Would love to try different feeding combinations!

Accurate 8 added to the to-buy list!

I'll keep updating this thread to show how she goes

Thanks a million