Does CO2 reduce flowering time at all?

Justin Freidman

Well-Known Member
Hi Guys,

Just wondering if CO2 speeds up the grow at all? i.e. reducing flowering time?

I'm about to start a new grow tomorrow, but go away in 3 months, so cutting it a bit fine. Flowering time is 50-60 days (growing motivation from serious seeds)

J.
 

cindysid

Well-Known Member
If other factors are optimum (light, water, nutrients), then I feel that it speeds it up a bit. I ran my first cycle with Co2 recently and my Blue Dreams finished about a week sooner than without, plus the buds were larger.
 

Justin Freidman

Well-Known Member
Are you counting flower time from when you flip 12/12? Or once they start showing hairs?

I guess I must flip mine by 1st of June. So that gives me 4 weeks to see how the do from seed.

I have everything dialed in nicely from my last grow, this is my first time running CO2, will be running at 1000ppm.
 

Craigson

Well-Known Member
If other factors are optimum (light, water, nutrients), then I feel that it speeds it up a bit. I ran my first cycle with Co2 recently and my Blue Dreams finished about a week sooner than without, plus the buds were larger.
Is there any benefit to adding CO2 to a NON-sealed grow room?
 

cindysid

Well-Known Member
My room is only partially sealed and I'm able to maintain about 1200ppm without much problem. My room doesn't exhaust to the outside, but it does pull in air from the adjacent room through small gaps near the ceiling. I plan to seal those up soon. I'm running 2k hps in a 9x7 area with a 10k btu window a/c.
 

chemphlegm

Well-Known Member
Is there any benefit to adding CO2 to a NON-sealed grow room?
if the lack of fresh air is causing flowering plants to delay finish, then yes, addinfg c02 will speed up flowering for that grower.
no, c02 will not speed up flowering anymore than proper feeding and watering.

here's the deal=plants can use all 400 ppm's of ambient air, and around every surface of every plant the air is exchanged multiple times a second, refreshing the c02 supply-outdoors. Indoor we cannot move air like the outdoors does, and cannot replace the c02 at every surface of the plant as often.
In your non sealed room, assuming air is circulated with home/outdoor air as normal- your plants will thrive and you will enjoy a great experience, you will not be able to blame anything on the lack of c02.
In a sealed room like mine plants will also grow and thrive inside without the addition of fresh air, I dont use outdoor air for anything, there are no inlets , I am not anal about the entry door to the rooms and close it behind me mostly.

without c02 I can harvest normally but the weight is lighter, the smells are diminished, the plants are not as happy as I see them. I eel guilty when I dont replace the propane for a couple days even. A plant will grow to its weakest resource. lack of sun dammit thats my weakest resource and I dont want anymore weakest resources. I run identical cycles with same feeds, no ph, no chems and can clearly see what c02 does for me. Cost me 12 dollars every 45 days to feed the c02 gen. Thats the cost of one small bud maybe, and better bigger ones are made available with my c02 augmentation. hope that helps. I would not advise running a c02 generator inside living quarters. It literally is the same as lighting a propane bbq burner. the units have nice redundant safeties , tip over, o2 sensors, pilot sensor, etc....but still.
 

chemphlegm

Well-Known Member
You have to stop gassing for the last few weeks! Otherwise it can make it take longer! High Co2 levels inhibit ethylene gas from being produced by the plant. Ethylene gas is what ripens the buds....
sealed since 2009 I see awesome results with weekly harvests and gas on 12/12 since. the plants left without c02 for the last few never looked or performed better for me fortunate for me because I run a perpetual harvest flowering room, full time gas, and it rocks.
maybe "high levels" is not what I provide I dunno.
 

Dr. Who

Well-Known Member
sealed since 2009 I see awesome results with weekly harvests and gas on 12/12 since. the plants left without c02 for the last few never looked or performed better for me fortunate for me because I run a perpetual harvest flowering room, full time gas, and it rocks.
maybe "high levels" is not what I provide I dunno.
I had every high sativa x and landrace strains give me fits - till I shut the gas off for the last 3 weeks....

I quit gassing.....I can do everything I want to - without it.....Less work and stress overall too!

It can fill in those loose budding strains though.

My 2 cents on gassing.
 

chemphlegm

Well-Known Member
I had every high sativa x and landrace strains give me fits - till I shut the gas hoff for the last 3 weeks....

I quit gassing.....I can do everything I want to - without it.....Less work and stress overall too!

It can fill in those loose budding strains though.

My 2 cents on gassing.
. believe me I'd rather not use co2 if it didnt complete my resource list.
After reading the multiple growing issues here, jumping through hoops to achieve simple results... additives, special light schedules, tricks, illness, late finishers, no nose, stretching, deficiencie etc.... I notice the majority of these also choose not to make up their air with c02, all issues I dont have, you never know, could be all about the c02. did you know that burning propane to make c02 actually produces ethylene gas? ha!!! maybe thats the ticket to finishing on time?? as breeders also use c02 augmentation when they make reports, smoke, grow, uptake, and finishing times makes sense to me.



did you know that burning propane to make c02 actually produces ethylene?
and the chick that fills the tanks is hot, so....
 

Justin Freidman

Well-Known Member
I thought for the last few weeks of flower you just reduce your C02 to a normal level (300ppm) rather than stop gassing?
 

chemphlegm

Well-Known Member
the ppm's at my bush level is roughly 500ppm's full time, a scant 100 ppm more than my outdoor air on the other side of the wall.
I dont do well with pure sativas, go figure @ Dr. Who
 

Justin Freidman

Well-Known Member
I'm running a Centinel CPPM-4i in my room. It's very interesting to see how the C02 levels change day to day. When I built the room I hadn't sealed it and was running negative pressure with an exhaust fan.

If my workers were in the office next door, it would raise the levels in my grow room to 600+

Now it's completely airtight.
 

Dr. Who

Well-Known Member
. believe me I'd rather not use co2 if it didnt complete my resource list.
After reading the multiple growing issues here, jumping through hoops to achieve simple results... additives, special light schedules, tricks, illness, late finishers, no nose, stretching, deficiencie etc.... I notice the majority of these also choose not to make up their air with c02, all issues I dont have, you never know, could be all about the c02. did you know that burning propane to make c02 actually produces ethylene gas? ha!!! maybe thats the ticket to finishing on time?? as breeders also use c02 augmentation when they make reports, smoke, grow, uptake, and finishing times makes sense to me.
did you know that burning propane to make c02 actually produces ethylene?
and the chick that fills the tanks is hot, so.
...

You forget I ran greenhouses? That's all covered in Nelson's Greenhouse guide......

It can. Only by incomplete combustion or the use of contaminated gas.
So then, are you pushing the gas out at a rate higher then a regulator allows? Is the propane you buy contaminated?

The amounts produced are small. The problem is build up. If you have this problem in a greenhouse - you see it in winter.
If you had this problem, you would know! Ethylene is a growth hormone. The plants would not get tall. You would get yellowing you could not control and you could not propagate clones in area's with that problem....

THIS is exactly why a "sealed" room,,,still should have the air turned over with fresh air. I used to do it every 2 hrs during lights on.... Funny how those grow gods of writing books. Never seem to mention that!

I understand you like your Co2. I still say you can learn to do with out it....

I didn't jump through any "hoop" to do this - That "hoop", includes CO2 use!

20161102_095818.jpg 20170127_121349.jpg
 

thumper60

Well-Known Member
You forget I ran greenhouses? That's all covered in Nelson's Greenhouse guide......

It can. Only by incomplete combustion or the use of contaminated gas.
So then, are you pushing the gas out at a rate higher then a regulator allows? Is the propane you buy contaminated?

The amounts produced are small. The problem is build up. If you have this problem in a greenhouse - you see it in winter.
If you had this problem, you would know! Ethylene is a growth hormone. The plants would not get tall. You would get yellowing you could not control and you could not propagate clones in area's with that problem....

THIS is exactly why a "sealed" room,,,still should have the air turned over with fresh air. I used to do it every 2 hrs during lights on.... Funny how those grow gods of writing books. Never seem to mention that!

I understand you like your Co2. I still say you can learn to do with out it....

I didn't jump through any "hoop" to do this - That "hoop", includes CO2 use!

View attachment 3934855 View attachment 3934857
if ethylene is being produced theres some thing wrong with the burner, that comes from incomplete burn, life long gas man here. if ethylene levels get high enough u can smell it kind of sweet smell,i deal with it all the time folks putting in there own propane apliances,an not setting the burner correct
 

chemphlegm

Well-Known Member
You forget I ran greenhouses? That's all covered in Nelson's Greenhouse guide......

It can. Only by incomplete combustion or the use of contaminated gas.
So then, are you pushing the gas out at a rate higher then a regulator allows? Is the propane you buy contaminated?

The amounts produced are small. The problem is build up. If you have this problem in a greenhouse - you see it in winter.
If you had this problem, you would know! Ethylene is a growth hormone. The plants would not get tall. You would get yellowing you could not control and you could not propagate clones in area's with that problem....

THIS is exactly why a "sealed" room,,,still should have the air turned over with fresh air. I used to do it every 2 hrs during lights on.... Funny how those grow gods of writing books. Never seem to mention that!

I understand you like your Co2. I still say you can learn to do with out it....

I didn't jump through any "hoop" to do this - That "hoop", includes CO2 use!

View attachment 3934855 View attachment 3934857
thusfar I dont have any of the issues mentioned. no long flower times, no shorties, no ripening probs, no yellow, good clones...I dont mess with the propane, just hook it up and spark it. I dont ever give ethylene gas a consideration here. I dont purposely exchange air, but of course it isnt an air tight autoclave, just a room with no vents. I leave the door open incidentally occasionally too, I think thats the real key here, because it works well lol.
I hate my c02 btw. I wish it didnt complete my resource list and show worthy improvements in my finished product. Itf I had any of those issues and you told me it was the c02 I'd be on it ;)
.great results deserve a repeat
 

Dr. Who

Well-Known Member
... but it is one of the stars needed to fall into alignment for optimization, which not only decreases "flip to ripe", but also quintessential in quality control. I've mentioned this before, amongst many other benefits, increased CO2 elevates a plants light saturation threshold.


@Dr. Who "Breadcrumbs".
Later light saturation point! Yeah Odin! I've stated before that's what Co2 use does. Gives back a bunch of the plants effective use of the light provided.....Everything has to be rather tightly balanced for that increase in Co2 to actually work...."Breadcrumbs".....
 

Dr. Who

Well-Known Member
thusfar I dont have any of the issues mentioned. no long flower times, no shorties, no ripening probs, no yellow, good clones...I dont mess with the propane, just hook it up and spark it. I dont ever give ethylene gas a consideration here. I dont purposely exchange air, but of course it isnt an air tight autoclave, just a room with no vents. I leave the door open incidentally occasionally too, I think thats the real key here, because it works well lol.
I hate my c02 btw. I wish it didnt complete my resource list and show worthy improvements in my finished product. Itf I had any of those issues and you told me it was the c02 I'd be on it ;)
.great results deserve a repeat
Quite true - If it works for you!

It only took some time to find out how to not use it, and still reap the same type of reward!
 
Top