Cattail control?

Roy O'Bannon

Roy O'Bannon

Well-Known Member
2oth wk Auto. 2nd grow.
It has just been taunting me with foxtails and spindly unfilled trichomes in lots of spots.

The light sf1000 at 11-12". I dimmed tp just above 60% yesterday. Dropped 100ppfd basically.
Temps are 75-78. rh 50.

18/6 light cylce right now. Just lowered it to 14/10, hasn't cycled that yet though.
Maybe dim the light? Idk
What do you think?
 

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Wizzlebiz

Wizzlebiz

Well-Known Member
1 shortening the light cycle isn't the answer.

2 instead of dimming the light raise the light higher.

3 increase temps to 81-85 for led grows.
 
Roy O'Bannon

Roy O'Bannon

Well-Known Member
Wizzlebiz said:
1 shortening the light cycle isn't the answer.

2 instead of dimming the light raise the light higher.

3 increase temps to 81-85 for led grows.
Click to expand...
I have a new tent for the next grow. I have the cables up over the bar in this one, I'm out of vertical space.

On the temps being higher. I could easily raise them, but am I worried about my rh going over 50? I would need 60rh to match a vpd chart at higher temps.
Is 60rh ok in late flower? I always see people saying the less the better, as in 40-50 tops late flower.
 
Wizzlebiz

Wizzlebiz

Well-Known Member
Roy O'Bannon said:
I have a new tent for the next grow. I have the cables up over the bar in this one, I'm out of vertical space.

On the temps being higher. I could easily raise them, but am I worried about my rh going over 50? I would need 60rh to match a vpd chart at higher temps.
Is 60rh ok in late flower? I always see people saying the less the better, as in 40-50 tops late flower.
Click to expand...
My RH stays under 50 at 85 degrees. Get a dry towel in there daily to combat it if you don't have a dehumidifier.
 
Roy O'Bannon

Roy O'Bannon

Well-Known Member
I mean vpd chart says that I would have to have a 5 degree leaf temp diff to run that. How are you getting that difference. My leaf temps are always air temp with my light. I even tried it really close once to see if it raised them.
Here is what I'm looking at.
www.dimluxlighting.com

Vapor Pressure Deficit VPD Calculator - Dimlux Lighting - The Best Grow Lights

Vapor Pressure DeficitCalculator Calculate both Room VPD and Leaf VPD automatically Just enter the value below to generate the VPD values for your room and your plants. You’ll need to know the room’s temperature, relative humidity, and the plant’s temperature. We recommend calibrating your...
www.dimluxlighting.com www.dimluxlighting.com
 
Star Dog

Star Dog

Well-Known Member
Fwiw 50% rh is the absolute lowest I can hope to reach and it's a novelty, humidity around here is a cunt.
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55/62% is nearer the normal and i've not seen botrytis in years now.
 
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