Sick plant

[dragondust]

Here is a small sweet seed mix day 46 Not very big but healthy until this week. 1 gal pot with 1/2 scop of osmocote plus mixed with lamberts potting mix. Getting only rain water of ph 6.4.

Showed some cal def on the lower leaves on 9/5/16. I Did not have any calmag. I did have calcium nitrate and Epsom salts. Mixed 2 grams cal nitrate with 1 gal then mix 2 grams of epsom salts to the gal. Ph came out to 6.5.
Feed about 1/3 gal to her and feed the rest of my girls on osmocote. The next days was worse. The others look fine.

Next watering was only rain water on 9/7

Its getting worse and spreeding.

Got some calmag bonticare from the store today.

What to do? Flush and feed calmag?

9/5

9/6

9/7

Today

 

[Heavily Medicated]

Looks alot like heat damage. Is the damage just on the top of the plant nearest to the light? Try to keep temps below 85 F. You may have to move the light higher, or increase air flow.

 

[dragondust]

Temp are high 86f but cooler than few weeks ago 94f. I have good air flow and light is far way over 20inches led. It started on the lower part then the top.

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[Gatorbackbob]

Possibly root bound?

 

[HashMaster]

@Waira

 

[Waira]

..I think the Osmocoat is causing a toxicity issue,... those type of fert's are not recommended for canna in general, auto's in particular...they make too many hot spots in the soil, and if they break down too fast, (heat accelerates this!) they release too much too fast,... you have mixed symptoms too (including some heat stress), but Mg defc. is not one of them, so adding the salt bomb of Ca-Nitrate and epsoms made matters worse,.... Don't guess on the diagnosis and start treating for something not confirmed! ...the burns at the "teeth" margins are K toxicity (looks a lot like K defc. too, ironically), and too much of that and other certain nute elements will interfere with Ca uptake even if there's plenty in there,... are you feeding any other nutes? I'd say a flush is in order, start with 3x the pot volume of water, pH'ed to 6.5,... have you ever checked the pH in the pot before? And do you have a TDS or EC meter? That wiould tell you much about the nute load in there by testing the run-off from the flushing,... pH can be done that way too, but usually with dubious results...

... link to an improved run-off test and calculation-- https://www.autoflower.org/threads/...-for-run-off-testing-and-ph-estimation.41733/

 

[dragondust]

Thanks. Flushing now. I have a tds and ph meter. I will test the ppm and ph of the media run off.

I know ocomacote is not recommended. The heat and the small container. 1gal did accelerate the fertilizer dosage. She was a test like my Canary in a coal mine.

I have 2 others in the tent on the same fert but in 3 gal pot. They seem fine so far. Going to test them run off of them too. The bigger pots probably kept the fertilizer from getting too hot temp wise.

The ca nit and espon salt at 2 grams per gal. Come out to 390pm and with a backround ppm 40. Not to salty. But but as you can see it definitely did not help.

The osmocote plus has all nutes in it except calcium. There is very little to none in my rain water. This is why i thought is was a cal def.

Thanks again.

 

[dragondust]

Run off ppm is 1040 and ph dropped to 5.3 with 6.4 rain water in.
Should i flush more with tap water of ph 8.

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[mohawk warrior]

@Waira might speed things up
or click reply under his message then respond

 

[Waira]

...yeah, with the nutes release come the acidity, which will contribute to the whole Ca lock-out mess,... using rainwater with little to no pH buffering (low mineral content, namely CaCO3) is part of this,... as the plant takes up nute's, particularly cations like K+/NH4+, the roots release an H+, acidifying the root zone,... with no Ca-Mg going in, no minerals in the water, what buffering the soil has from _presumably) lime is overwhelmed or depleted by now,...
... excellent on the TDS! 1040ppm as a run-off is high, confirming the overfert'ing, and the increased acidity of the run-off confirms it's too low pH in there... What's your tap water like mate? An all carbonate Ca-Mg supplement is called for as well (General Organics CaMg+ is great)... flushing with higher pH water is a good call now that we know WTF is going on in there- pH-up will use OH- to raise the pH, but won't do shite for actual buffering like carbonate will,... that's why I asked about your tap water and it's ppm, it might be better for this job!