Hermies, every grow.. help!

SheeshM

SheeshM

Well-Known Member
Not sure what the problem is but temps are on the high side for flower, IMO. Sounds like you're already working on lowering the temp. GL!
 
coreywebster

coreywebster

Well-Known Member
Sort your temps out, why would it be that hot in winter? You running lights at night or day?
Where is your heat ventilated to?

Next thing, check there are no extension cables with LEDs on, tin foil over them if there are.
Check your timer isn't faulty, go in there every 15 min in both light and dark period and make sure its on when it should be and off when it should be.

Use cold water from the tap and let it come to room temp, not hot water cooling down.

Get a bigger extraction fan, that 4" S+P is probably up to the challenge of pulling through the filter
 
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Sfrigon 1

Sfrigon 1

Well-Known Member
coreywebster said:
Sort your temps out, why would it be that hot in winter? You running lights at night or day?
Where is your heat ventilated to?

Next thing, check there are no extension cables with LEDs on, tin foil over them if there are.
Check your timer isn't faulty, go in there every 15 min in both light and dark period and make sure its on when it should be and off when it should be.

Use cold water from the tap and let it come to room temp, not hot water cooling down.

Get a bigger extraction fan, that 4" S+P is probably up to the challenge of pulling through the filter
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Well said
 
Craigson

Craigson

Well-Known Member
My first feeling is too high of temps.
If thise are ambient temps at 34C then the temp directly under the lights is probably even hotter
 
UKGhost

UKGhost

Member
coreywebster said:
Sort your temps out, why would it be that hot in winter? You running lights at night or day?
Where is your heat ventilated to?

Next thing, check there are no extension cables with LEDs on, tin foil over them if there are.
Check your timer isn't faulty, go in there every 15 min in both light and dark period and make sure its on when it should be and off when it should be.

Use cold water from the tap and let it come to room temp, not hot water cooling down.

Get a bigger extraction fan, that 4" S+P is probably up to the challenge of pulling through the filter
Click to expand...
Thanks for the reply. I run the day cycle at night as its cooler and cheaper for electricity. I vent out to a window which is open and another window is left open to let fresh air in.

All cables are outside but I did tape the blue LED on my oscillating fan when I had that in a DR240. I had a digital timer which was coming on at random times so purchased an analogue one to stop that.

I use cold water from the tap, let it stand until room temp then feed.

I have a 5" S&P which I will look to use as I felt the 4' couldn't move enough air out even though it was only a 1m x 1m tent.

Even when the outside room temp was low the temps always got up to 34c, I believe the 600w HPS is hot no matter what, in summer it reached 38c on hot days.
 
coreywebster

coreywebster

Well-Known Member
UKGhost said:
Thanks for the reply. I run the day cycle at night as its cooler and cheaper for electricity. I vent out to a window which is open and another window is left open to let fresh air in.

All cables are outside but I did tape the blue LED on my oscillating fan when I had that in a DR240. I had a digital timer which was coming on at random times so purchased an analogue one to stop that.

I use cold water from the tap, let it stand until room temp then feed.

I have a 5" S&P which I will look to use as I felt the 4' couldn't move enough air out even though it was only a 1m x 1m tent.

Even when the outside room temp was low the temps always got up to 34c, I believe the 600w HPS is hot no matter what, in summer it reached 38c on hot days.
Click to expand...
Cool man, you got most bases covered, that fan is your weak link I think.
I used to run 3 x 600w hps in a 4x8 with an 8" fan and unless there was a heat wave I never had to turn it past 2nd speed of 3.
The bottom line is if the ambient air temp is lower than ideal temp then its just a matter of how much cfm you need to stay X degrees above ambient.
There are a lot of fans on the market that on paper look good and sound quiet but some of them shit a brick with the slightest impedance, some can lose 75% of the cfm with a meter of duct and a filter.
Its always going to be less work on the fan if the filter is bigger. I highly recommend getting a fan, you can pick up a second hand ruck on ebay pretty cheap.

I thought you had said what your ambient temp was, but cant seem to see it now. If you tell me the air temp of the room the tents in on a night without lighting on I can tell you how many cfm you need to stay in a better range.
 
Calbrowno

Calbrowno

Well-Known Member
I had the exact same problem, grow area seemingly tuned in but poor results time and time again. I invested in some decent genetics and even things like light leaks (if minor) don't seem to make em hermie. I would just renew your genetic inventory and do a run with entirely new strains, see the difference
 
UKGhost

UKGhost

Member
So you think the weak fan allowing the temps to rise could be the factor? I have a 5" S&P fan which is powerful and would do s better job than the 4".

Ambient air temp outside room was 16c when tent off up to 19c when tent on. No matter how many fans running or windows open, it always went up above 30c when tent on.

I have taken the tent to the dump so no longer running it, if I start again I will use the room itself which is 3.3m x 3m.. not sure how much cfm/size fan I would need for that but it would have 1kw of HPS running via a 600w and a 400w unit.
coreywebster said:
Cool man, you got most bases covered, that fan is your weak link I think.
I used to run 3 x 600w hps in a 4x8 with an 8" fan and unless there was a heat wave I never had to turn it past 2nd speed of 3.
The bottom line is if the ambient air temp is lower than ideal temp then its just a matter of how much cfm you need to stay X degrees above ambient.
There are a lot of fans on the market that on paper look good and sound quiet but some of them shit a brick with the slightest impedance, some can lose 75% of the cfm with a meter of duct and a filter.
Its always going to be less work on the fan if the filter is bigger. I highly recommend getting a fan, you can pick up a second hand ruck on ebay pretty cheap.

I thought you had said what your ambient temp was, but cant seem to see it now. If you tell me the air temp of the room the tents in on a night without lighting on I can tell you how many cfm you need to stay in a better range.
Click to expand...
 
coreywebster

coreywebster

Well-Known Member
UKGhost said:
So you think the weak fan allowing the temps to rise could be the factor? I have a 5" S&P fan which is powerful and would do s better job than the 4".

Ambient air temp outside room was 16c when tent off up to 19c when tent on. No matter how many fans running or windows open, it always went up above 30c when tent on.

I have taken the tent to the dump so no longer running it, if I start again I will use the room itself which is 3.3m x 3m.. not sure how much cfm/size fan I would need for that but it would have 1kw of HPS running via a 600w and a 400w unit.
Click to expand...
For sure the bigger fan will help, as long as your not venting back into the room which recycles the air and gets warmer each pass through the tent.
One other thing would be not sticking your thermometer directly under the light, not that would make a shit bit of diff to having hermies or not but it would give you a false reading.

I have ran a 600w in the same space, or a mate did that I micro managed, I think we ran a 5" or 6" ruck for that set up. It also depends on the S & P fan model, some of the mixed flow versions really don't handle filters well at all, you can end up with 50% loss in cfm instead of 20%.

If you go with the bare room, same wattage it takes the same cfm to remove the same heat. The room warms slower but the total air exchange is less. Works out the same in the end. If you increase overall wattage you need to increase cfm.

Hope you get it sorted out!
 
Hydrowannabe

Hydrowannabe

Well-Known Member
Does one hermied crop often lead too future hermied crops if the room was not cleaned out well in between crops? Maybe that was your problem? I'm interested
 
G

Greybush7387

Well-Known Member
Make sure water isnt to cold shoot for like 68 if u cant test the temp or havent you def should or get aquarium heater. Even 1 watering to cold can make plants throw balls cause they think they dying.
 
Brandon137

Brandon137

Well-Known Member
I have similar issues in my grow and temps swing in mine to 16-18c lights off 20-24 lights on I have cheap 4" fan to in my 4x4 tent. I'm working on my 3rd grow and my first two both had hermies
 
Hydrowannabe

Hydrowannabe

Well-Known Member
Greybush7387 said:
U serious in a indoor environment? Of course it would add stress. Read any literature about cold water and herms.
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Adding stress and turning a plant are way different things. Good genetics can take a lot of stress before they start to hermie...is alls I'm saying.
 
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