What makes autos stop flowering?

[bippo]

Hi All,

I am having a few issues with 3 of my autos. I have 3 Dr Feelgoods and all them have stopped flowering. They are 5 weeks old (3 veg and 2 flowering) and last week they just stopped. The tops where the preflower commences have all gone light green wheres the rest of the leaves are dark green.

On one of them the pistils appeared for a week but now they are starting to turn brown. Theres been no new growth and it's like they have stopped flowering.

I have grown this strain a fair few times already and by about this stage i have always noticed a lot of new growth. So it's not a slow starter this atrain.


This has happened to me in the past with a few other autos, they simply stop flowering.

I am using canna coco as the medium
Nutes are all the usual canna line, so its rhiztonic, canna A+B and then boost a few weeks into flowering which i havent yet used.

My Ph is usually around 5.6 and i am giving them all day sun with about 4-5 hours of light. I need to do this because i have 2 phenos % weeks into flowering so i need the lights to stay at 12/12.

So what can i do to ghet them back to flowering? Or do i just not bother? I have this which i have been using in the past when i have had a few issues with N but dont know if it's any good for this issue i am having now?

 

[A4]

Put up some pics of the affected plants bippo, it is hard to tell what is going on without seeing exactly what you are talking about. Could be stunted but like I said, impossible to tell without pics.

 

[bippo]

ok will do once i get home from work.

 

[cabledawg]

not sure if i read that right, you are sitting them in sun for 4-5 hours then under a light ? no matter what type of light ya are running nothing matches the sun , I think you may have confused the poor girls and they dont know what to do.

 

[bippo]

Sorry I mean they are in the sun all day and then at night i put them under lights for another 6 hours, so they are getting a combined total of around 18 hours of light a day.

I came home and its much the same as its been for the last couple of days. No new growth and its just stagnet, trying to take pics.

 

[bippo]

Ok here are the pics.

http://imgur.com/a/5Q5xF

The girls look healthy and there are no signs of deficiencies from what i can tell. I LST them all as i now do with all my grows. Maybe they are taking their sweet arse time to flower BUT at this stage the buds have been a lot bigger and have swelled up. I grew this strain only a month ago as its all the autos i had left.

I checked my calendar and they were put into the coco medium on the 19th of August so they are 49 days from seed (not the 5 weeks i mentioned in the OP) and from exp at this stage they should already been hitting the home stretch. The weathers been crazy in my part of the world with a lot of grey cloudy skies and temps fluctuating from 27 the other day to 10 today. Its been stupid this year tbh but i have been forced to put them outside due to the phenos i am growing which are on 12/12 light cycle and because i have no room in the grow tent. The phenos are massive and keep taking up space..so i have had to built a rather ghetto and crapy temp growing box for these which i am using my old CFL set up. There is one 130W CFL and then 5 scattered 42W CFL. All warm side of spectrum for flowering phase. I have feed them according to the canna guide which i have done since switching over to canna-coco late last year without any issues at all.

As i said in the OP i have had several other autos do this to me, they reach a certain stage and then just stop. I had to just destroy the others because i tried cal-mag and all the rest but it didn't stimulate them to go back to flowering. Even tried a full dark cycle.

Should i persist or just give up on them? Have they have somehow turned into non autos? I am stumped and tbh after my experiences with this issue in the past it's actually my biggest fear atm growing as i seem to be doing everything else right and hardly have an issues with nute deficiencies or mould etc.

 

[Gonzo]

I can not say if changing light DID stop your plants from flowering but it brought some difficulties anyway.

Plants do not feed themselves as we do. We go around the city and pick this, that, today we eat vegies, tomorrow meat. Today we stay in the dark, tomorrow go on the beach.
Plants are much more simple, they adapt to their environment and stick with this habbits. If you offer them CFL light they slowly adapt to it not in the way that theyjust like it, they develop different chemical structure as if they would be under HID or LED. Plants use receptors on their leafes which are light sensitive and measure at least: duration of light, intensity of light, where it comes from, what kind of spectrum it brings. Plants are then built in accordance with these measurements. They try to go tall, they develop broad leafes, they develop more branches, turn themselves towards light or whatsoever. All because PARTICULAR NOT ANY kind of light is available.

And then you change light source suddenly, its whole chemistry is now wrongly set for this new source. Since there is no stable pattern (you change it 2 times a day) to stick with, plant is confused.
Besides you had put stressed plant under LST, perhaps lowering its terminal bud down and make new chemical desorientation.

If all these changes come in the times when plants change their chemistry because of need to produce flowers instead of veg growth someone might say: Houston, we have got problems.

I think that you just expected plants to be more adaptable as they really are.

 

[A4]

They look perfectly healthy bippo. I admit, they don't look like 49 day old plants but I wouldn't give up on them quite yet. What exactly are you feeding right now and for the past two weeks?

 

[bippo]

I have decided i will now just leave them outside and they can take their time flowering.

I am feeding them just the cana nutes and following the guide which has been successfull for me for the past 3 grows.

Canna A+B
Rhizo
and just started adding boost

I also use monstabud as an additive.

I am not over watering them and just giving them 2-3 litres of water/feed every 3-4 days.

I think i have confused them in terms of light, so its strictly sun from now on.