Hey, RIU. Having another leaf problem. Pls have a look and help if you can

ThorGanjason said:

If your temps are getting up to 90 (°f, what's that like 28-30°c? I dunno) then that is probably high enough to where your lights could burn from a height they usually wouldn't.

I'm thinking that you had a nitrogen deficiency which fixed itself, and then started having a calcium deficiency that started with the spots and maybe just a bit of a magnesium deficiency that might be enough to turn your stems/petioles red but hasn't reached the leaves yet.

Cal mag is definitely seeming like your best option. Around here its really expensive so I bought some Epsom salt (magnesium and sulfates) and some calcium nitrate (calcium and nitrogen). They're both water soluble and readily available to the plant.

Cal mag is good stuff to have. I've heard during flower plants can't get enough of it.

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Exactly.. Cal Mag deficiency during first weeks of flower till the end of it is such a common thing to have. Even if there's usually plenty of Mg in soil, bigger quantity of potassium can lock it out. Now I'm using biobizz biogrow and aptus camg-boost and adding some liquid seaweed just because I have and I do not see deficiencies anymore..
And temps are a bit high indeed.. 90 is walking on the edge already and if you say that you close the doors when somebody is visiting you, so if they get like 95.. well you could get more problems.. also flowering at this temperature(90+) decreases THC potency.

Glad you solved N deficiency, good luck on getting those spots away

If you didn't see my other post, this problem (and possible a little bit just genetics anyway) has caused the plant to start making an insane about of bananas. Picked out near to 100 yesterday. One of which can already popped I think. So no sensi now. Still hoping to keep the plant alive somehow but not really sure what to do. Been to a few grow shops this morning - No one stocks calmag here and it costs a bomb online. Started germinating some autoflower seeds...

Super Subliminal said:

If you didn't see my other post, this problem (and possible a little bit just genetics anyway) has caused the plant to start making an insane about of bananas. Picked out near to 100 yesterday. One of which can already popped I think. So no sensi now. Still hoping to keep the plant alive somehow but not really sure what to do. Been to a few grow shops this morning - No one stocks calmag here and it costs a bomb online. Started germinating some autoflower seeds...

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Oh man, so sorry to hear that.. I myself never had hermies and my grow room and my inexperienced growing habbits are giving a lot of stress to the plants, so I sort of believe that it comes more from genetics than from environment.. I've also read that hybrids with asian strains are more common to have hermies.. dunno how much of that is true..

https://www.tropicannahorticulture.com/aptus_camg-boost.htm

whoa 28 pounds for 500ml plus delivery like 6 pounds.. ouch.. In a local store I got 500ml for like 20euros.. Anyway, 150ml I'd say would be sufficient for quite a long time.. since you use 1ml/liter with every or every second watering. If you cannot get ferts you can try to get epsom salt which has S and Mg and dolomite lime, they are quite cheap. Epsom salt should be definitely around you somewhere, dunno about dolomite lime.. dolomite lime also increases soils buffering property, so you would care even less about your water pH..

After failing at the grow shops I've ordered a non brand name cal and mag supplement but it won't arrive til Friday! Out to try and find some lime now

I'm telling you-- I don't know if you have a lowes or home depot (doubt it) but Epsom salt (can find at any pharmacy for ≈ $5) and calcium nitrate (should be able to get at any plant nursery-its a fertilizer) is only 5 or 6 bucks and would rid your need for cal mag.

And you can also buy a 40 pound bag of dolomite lime for 3-4 dollars, and mix it with your soil before you plant. It not only helps buffer your pH (constantly) but also provides long term calcium and magnesium.

I used to have to supplement my Canna nutes with magnesium regularly. I would get the slight yellow zebra stripes on my leaves and used to use epsom salts for the Mg I was lacking.
I have never uderstood why companies don't include alot of the trace minerals (molybendum, magnesium, copper, iron, magnesium, calcium...)
that plants seem to need or lack at some point in their growth.
It can be very confusing trying to figure out which things your plant is recieving too much of, or not enough.
I switched ferts four months ago and have never looked back.
The one I use has all the trace minerals in it and have never had to supplement, or change a thing.
I use a brand called Jacks Classic Bloom Booster. This company makes other nutes as well, that's just what I use for blooming.
As far as calcium, I am going to be honest.
Until I stated viewing these threads, I never heard of a calcium deffienciency nor have I ever seen one.
I am still trying to find the scientific evedence that it makes a difference.
It is a lot like Phing your water.
Can EXTREMELY high or low PH levels affect your plants ability to absorb nutrients? I'm sure it can, however most of us on public municiple water systems will never see Ph spikes that reach anywhere close to harmfull levels. I have been growing vegetables in my garden and many 1000s of houseplants in my life and ALL have been watered directly from the hose. (chlorine is a naturally occuring mineral as well, but thats another argument)
Do you think farmers PH their water? You have to discern for yourself which statements are scientifically proven facts, myths or just common practices people have adopted because they heard it before. Try and find a calcium deffiencency on a chart. Of course Cal Mag works because magnesium defficiency is common and this corrects that as well.
It certainly doesn't hurt to adjust your PH, I just haven't done so in almost a year and have noticed absolutely no difference.
Here are the specs for the nutes that work for me. (notice there is no calcium listed?) Never used anything else since I switched. I'm no scientist, I just have never noticed I needed this.(and yes I get great yields of 4 oz. per plant average)[h=2]Guaranteed Analysis[/h]

have garden lime and epsom salt . couldn't find calcium nitrate

the lime doesn't dilute. do you have to boil it?

if anyone knows can they quickly tell me how to apply this stuff. everything i find tells you to add it to the soil before you've even started growing the plant which is totally useless to me.

Super Subliminal said:

have garden lime and epsom salt . couldn't find calcium nitrate

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Gardn lime will help your cacium issues but it will take it few weeks once applied before it begins too help. I noticed you said your plant was throwing an insane amount of bananas. If I remember correctly its bagseed right? If so there is a very good chance you have a straight up hermi. Very common in commercial bag seed.
My comment on spider mites was more of a precaution than anything. Some of the spots look suspicious.

Top dress your pots with with a couple of tablespoons of the garden lime then gently work it into the top inch or so of your medium and water well.

OK. Thanks boss

Yeah. It's bagseed. Seeded weed, not sensi, so good chance this would have happened anyway I believe, but I possibly made it worse. Who can possibly tell.

Little tiny bit of good news is the plant seems to have stopped making bananas. Although I seriously doubt I got them all in time

Yeah, you'll be glad you got that lime. It is not water soluble, so you'll have to wait for you microbes and good bacteria to break it up. It can take weeks before it starts supplementing the plant well, maybe longer.

BUT! The good news-- lime is an amazing pH buffer. Next time you prepare your soil, mix like a tablespoon in per gallon of soil. For now a teaspoon or two as a top dress, mixed in the top couple of inches the beat you can--thats about as close as you're going to get, unless you want to take the chance of rinsing the soil out of your roots and switching over entirely to fresh dirt. Probably not a good idea seeing as how it will take a while and you are flowering anyways, not to mention the shock.

An interesting point about the calcium. Even though you couldn't find the Ca nitrate, the Epsom salt should really help out.

I had to do basically exactly what you are doing-- top dress the soil with the lime and then when you are preparing your water, boil a couple cups and add the espom salt to it so it dissolves. One tablespoon per gallon of water is what I used, and water with the Epsom salt for about 4 waterings (I water every day, mine are small) and you should start to see a difference. I actually heard spraying the under side of the leaves helps mg get in the plant quicker.

But once the def. is taken care of, water with the Epsom salt like once every four waterings to keep it from being deficient.

And I'd go ahead and mix that lime in a bunch of soil for your next grow. Hell maybe even water the soil with a little black strap molasses to make sure you have enough microbes to break that stuff up for you so its ready form your next crop.

Epsoms salt does not contain calcium. Magnesium and a bit of Sulphur is all has to offer a plant.

Alexander Supertramp said:

Gardn lime will help your cacium issues but it will take it few weeks once applied before it begins too help. I noticed you said your plant was throwing an insane amount of bananas. If I remember correctly its bagseed right? If so there is a very good chance you have a straight up hermi. Very common in commercial bag seed.
My comment on spider mites was more of a precaution than anything. Some of the spots look suspicious.

Top dress your pots with with a couple of tablespoons of the garden lime then gently work it into the top inch or so of your medium and water well.

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Great point. I never thought about it till now, but I use Sunshine Pro Mix # 4 with agregate. It has lime in it. Prob why I never added calcium or noticed a difference.

well I was also suspicious actually if it really is the calcium thing. For me it looked like spidermites because of those yellow little dots. ofc you said that it's not mites, but I've seen people saying that it's not mites until they got x30 magnifying glass and changed their mind when checking with it under leaves. Anyway, I'm not saying this is the case, just making sure it isn't Or it looked like beginning of Mg, what would mean that later yellow yellow spots would get necrosis.. But then again, usually it appears with few spots and later when new ones appear, old ones are already rusty.. Here's another def description of Ca.

I have a 40x loupe. Really if the spiders had done this to the leaves - which now look like complete shit - surely I would have seen just one, or one egg? I can even see the individual strands of hair on the spines of the leaves. Especially from all the time I spend looking at her and inspecting the trichomes

I believe the calcium is right because I read somewhere several days ago that an early sign is deformation of new leaves. This was happening for weeks to new leaves - they were just really fat and only 3 leafed - my silly head told me it was because it was a cross and these where the more indica leaves - I see now it was a sign... I cause this by pHing down too much