Very poor flower production since changes to grow. Pics inside.

[Xanode]

Are you planning on adding cal/mag, or maybe just mag, to your feed?

If u take a look at the pic of the plant from the previus harvest, that was fed Tap, A/B, PK and it turned out decent, even got repotted after stretch and didn't miss a beat. So i know something works.

I'll stick with tap for now on plants i want producing and experiment with cal/mag and RO on little single cola plants

 

[Jhowemca]

Xanode, you said it was getting up to 34*C. (That is 93*F)!

Then you said it got to 45* a couple of days. (Thats 113*F)!

Way too HOT! The plant is stressed and trying to stay cool.
It's gonna stretch out its buds and be airy, instead of growing tight and dense.

My guess anyway, as well as a few others earlier in the thread.

Even with the airy buds it won't be a total loss. You can make hash or cook with it.

Good luck!

 

[Can of Bliss]

I'm not going to claim to be an expert, but basic diagnosis would lead me to believe it's temperature and nothing to do with nutes.

Something to consider is humidity. The hotter it is the higher relative humidity the plants will want. Review this chart, there is some debate about what is best for cannabis at different stages, but I have yet to hear any horror stories from people who have actually tried it.

https://www.icmag.com/ic/picture.php?albumid=51120&pictureid=1650202

Maybe you know about this, but I feel like typing, it'll help me learn. Vapor Pressure Deficit (VPD) is essentially the difference between the amount of water in the air and the most water the air can hold (100% humidity). The thing to remember here; air holds exponentially more water if it's hotter, so not a simple calculation.
Now why is this important?
Plants feel the humidity around them and react to it. VPD is the closest model of how plans feel it we have. On that note, it's important to remember that the temperature of the actual leaf and humidity directly around it should be what you look at for this. An accurate infrared thermometer would be useful.
The biggest problem (from what I've picked up from reading stuff) about a too high VPD (air too dry) is that plants will close their stomata (little holes that let CO2 in and water vapor and O2 out). The plant does this to protect itself, but doesn't grow much and can have lots of other problems because of it.
One dramatic problem that happens (that's applicable to you) is the plant will actually overheat more. Since the stomata are closed the plants isn't transpiring much. Without that evaporation releasing heat, things get ugly. Add to that too much oxygen inside the plant. Another thing to remember, calcium is only taken up when the plant transpires, it can't move around in the plant to where it is needed like some nutrients. It only flows from the root up by the pump of evaporation.

Remember also, if you run a hot humid room, come lights out: it'll cool down quick and humidity can quickly get way too high giving mold problems.

 

[Xanode]

yup ive also been reading up on VPD interesting stuff.

To update:

The plant seems to be flowering properly now and another younger plant is looking better also.

Just to complicate things a little more

2 things have changed at the same time that may have solved the issue,

Summer temps are on their way down now, and lights on temps have come back into range

And

I have switched back to tap water


was probebly alittle of both, lack of cal/mag and spike in temps.

 

[liquidcooled420]

Check your light timer.
I had this happen one time. I just happened to be home in the middle of the day when lights are supposed to be out, when i heard the ballasts kick on. Turns out one of the tabs on the timer was not pushed in all the way causing the lights to turn on in the middle of dark cycle for 15 min. At first glance the tabs were all good but it was just enough up to activate the switch.

 

[MrBungle]

check your timer for odd "on or off" times... and how old is your bulb?

 

[Douglas.Curtis]

I'm not going to claim to be an expert, but basic diagnosis would lead me to believe it's temperature and nothing to do with nutes.

Exactly.

Also, the largest variable with cannabis is Mg requirements. Try epsom salt first, before going with cal/mag. It's cheaper and doesn't have any 'extras' in it. Make sure it's actually magnesium sulfate, there are magnesium salts out there which perform poorly while still being labled epsom.

R/O makes things rock solid predictable while tap/well water varies throughout the year.

 

[Xanode]

Check your light timer.
I had this happen one time. I just happened to be home in the middle of the day when lights are supposed to be out, when i heard the ballasts kick on. Turns out one of the tabs on the timer was not pushed in all the way causing the lights to turn on in the middle of dark cycle for 15 min. At first glance the tabs were all good but it was just enough up to activate the switch.

Will do thanks for the tip.

check your timer for odd "on or off" times... and how old is your bulb?

Around 7 months, going to change it out at 12?

Exactly.

Also, the largest variable with cannabis is Mg requirements. Try epsom salt first, before going with cal/mag. It's cheaper and doesn't have any 'extras' in it. Make sure it's actually magnesium sulfate, there are magnesium salts out there which perform poorly while still being labled epsom.

R/O makes things rock solid predictable while tap/well water varies throughout the year.

I just happen to have a box of magnesium sulfate laying around, so ill give it a try on a tester.

Normal flowering has definitely resumed sine temps have drops and a return to tap water, its just started its bud swell and its looking promising, guess I should just be thankful it didn't herm..

Maybe this plant won't be total bunk... I'll post up a fresh pic when I get a chance.

Thanks again for everyone's help with this.

 

[Xanode]

Well sorry to be an annoying fuck, but the problem remains....

I thought it may have been corrected with the return to tap water from RO, but i jumped the gun, Same thing is happening on a younger plant too maybe even a worse extent.

The only difference now between this and last harvest(the good one) is the air cooled hood, i have gone back to dirty tap water, and temps are now with normal ranges

So if anyone can think of anything else it would be massively appreciated.