When does Cannabis stop producing thc?

DankTankerous

Well-Known Member
The title says it all. I believe my plant has 3-4 weeks left, but the resin production is lacking, imo. The resin is there but then again it's an autoflower and the lights are cfl's.
 

hotrodharley

Well-Known Member
Thc is nature's sunscreen and it protects the Plant from harmful uvb rays. Simply add more uvb and your plant will naturally produce more resin.
And the source of this UV-B is . . . . . ? Good luck with that. Buy a cheap HID light. CFL doesn't cut it unless you have a boatload of them.
 

Machiavelli_719

Active Member
And the source of this UV-B is . . . . . ? Good luck with that. Buy a cheap HID light. CFL doesn't cut it unless you have a boatload of them.
A uvb reptile bulb. BTW the glass that is on an air cooled hid hood blocks most of the UVA UVB rays so unless your going bare bulb your losing out on thc production. I would admit 75 percent of the thc production is genetic related but the remaining 25 percent is growing conditions and quality lighting. If you lower humidity to 20 to 25% and add a reptile uvb bulb you're almost always going to see a difference in thc production. Just my experience.
 

DankTankerous

Well-Known Member
A uvb reptile bulb. BTW the glass that is on an air cooled hid hood blocks most of the UVA UVB rays so unless your going bare bulb your losing out on thc production. I would admit 75 percent of the thc production is genetic related but the remaining 25 percent is growing conditions and quality lighting. If you lower humidity to 20 to 25% and add a reptile uvb bulb you're almost always going to see a difference in thc production. Just my experience.
Thanks for the ADVICE rather than criticism. yeah my humidity is a little high, like the 40's and I don't have any idea's on getting it lower, unless you do. I'll look into the reptile bulb though. Cheers!
 

Blue brother

Well-Known Member
I use an Arcadia d3 (I believe) difference is night and day. I'm not sure whether u mean resin or thc, but they are not the same thing, true resin almost always contains thc but thc is found elsewhere also.
Resin is the plants natural defence to harmful uv-b rays, thc is believed to be th plants natural defence to anything that may try to eat it.

Get yourself a magnifying glass and inspect the trichomes. This will give u a good idea of when to harvest if that's what you want.

While low humidity does force the plant to produce more resin I don't think 40 is bad at all for flower.

Without going into much detail about it why do you think cfl is better for u than hid? I reckon I could argue hid over cfl for every situation, other than tiny tiny spaces or if your growing somewhere you can't exhaust hot air from (in which case youl never be happy)
 

Machiavelli_719

Active Member
I use an Arcadia d3 (I believe) difference is night and day. I'm not sure whether u mean resin or thc, but they are not the same thing, true resin almost always contains thc but thc is found elsewhere also.
Resin is the plants natural defence to harmful uv-b rays, thc is believed to be th plants natural defence to anything that may try to eat it.

Get yourself a magnifying glass and inspect the trichomes. This will give u a good idea of when to harvest if that's what you want.

While low humidity does force the plant to produce more resin I don't think 40 is bad at all for flower.

Without going into much detail about it why do you think cfl is better for u than hid? I reckon I could argue hid over cfl for every situation, other than tiny tiny spaces or if your growing somewhere you can't exhaust hot air from (in which case youl never be happy)
Yes you're correct I meant resin but I just typed thc because the OP typed thc in the question. And yes hid is always gonna top CFL when it comes to all aspects of growing besides heat. But to each his own.

-Machiavelli
 

DankTankerous

Well-Known Member
I use an Arcadia d3 (I believe) difference is night and day. I'm not sure whether u mean resin or thc, but they are not the same thing, true resin almost always contains thc but thc is found elsewhere also.
Resin is the plants natural defence to harmful uv-b rays, thc is believed to be th plants natural defence to anything that may try to eat it.

Get yourself a magnifying glass and inspect the trichomes. This will give u a good idea of when to harvest if that's what you want.

While low humidity does force the plant to produce more resin I don't think 40 is bad at all for flower.

Without going into much detail about it why do you think cfl is better for u than hid? I reckon I could argue hid over cfl for every situation, other than tiny tiny spaces or if your growing somewhere you can't exhaust hot air from (in which case youl never be happy)

Ah got it! I'm growing in a PC for right now until I can upgrade to something bigger. It's personal use and I don't need too much bud. However I'd love to grow different strains at the same time. But for now it's a PC Grow
 

Blue brother

Well-Known Member
Hey so just curious, when all the trichromes are cloudy do you start flushing then? and for 2 weeks?
nah I don't wait that long it's usually about half cloudy half clear, the trichs mature a lot quicker under the Arcadia and with the lower humidity. It's not unusual to notice newer clearer trichs towards the end. I reckon it's the plants last ditch attempt to conserve water.
 

Blue brother

Well-Known Member
nah I don't wait that long it's usually about half cloudy half clear, the trichs mature a lot quicker under the Arcadia and with the lower humidity. It's not unusual to notice newer clearer trichs towards the end. I reckon it's the plants last ditch attempt to conserve water.
sorry I went off there. My advice to you would be to wait until atleast half are cloudy then start ur flush, I give mine 2 weeks cos that's what it takes to get them to really use up everythin. You may find ur system/strain require different. Air on the side of flushing for too long there's nowt worse than bud with a noticeable amount of fertilizer stil present.

Another thing to look for is the pistils turning orange/brown, it should appear as if they are being swallowed up by the expanding calyx. When that happens you usually don't have long left.

Obviously this is all strain dependent and environment dependent.
 
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