Preferred temps at the end of flower

[MIhomegrown]

What’s everybody’s opinion on what the temperature should be at the end of flower? I’ve tried multiple ways of dropping temps, keeping it the same(78F) throughout, etc. Also I tried lowering light intensity with both cold and warm temps during the last couple weeks. Anyway I’m just curious to hear what people like or the results seen, thanks.

 

[Insomniac420]

I read it was 24c to 26c

 

[TychoMonolyth]

It's strain dependant. One thing we hear often is "know your plant".

Look up your strain's native habitat and go from there.

 

[AgentPothead]

Strain matters, but I've heard a good rule of thumb is 20-30C during veg and 18-26C during flower.

 

[TychoMonolyth]

It makes sense that temperatures drop in the fall. Sometimes a lot. Freezing even.

This is a leftover strawberry cough popcorn bud in late October. I wish I had waited to harvest.

BTW, I machine trim but this would have had a manual manicure.

 

[Douglas.Curtis]

I grow as little 'plant' as possible. I get almost zero stretch, so plants are vegged to size first. My goal is to grow the minimal structure necessary, to hold the maximum number of terpene/cannabinoid rich trichomes.

Incoming air: 68F/20C
Max Canopy temp: 70F/21C
Incoming RH: 20'ish

Frangible, terpene and cannabinoid rich cannabis with very little stem content. Flowers you can crush between your thumb and finger with a gentle pressure. A center stem which easily separates from the frosty, crumbly pile of cannabis flower. Soft, cool temperature smoke, with a smoking experience which is very much like inhaling a luxurious dessert.

 

[TychoMonolyth]

I grow as little 'plant' as possible. I get almost zero stretch, so plants are vegged to size first. My goal is to grow the minimal structure necessary, to hold the maximum number of terpene/cannabinoid rich trichomes.

Incoming air: 68F/20C
Max Canopy temp: 70F/21C
Incoming RH: 20'ish

Frangible, terpene and cannabinoid rich cannabis with very little stem content. Flowers you can crush between your thumb and finger with a gentle pressure. A center stem which easily separates from the frosty, crumbly pile of cannabis flower. Soft, cool temperature smoke, with a smoking experience which is very much like inhaling a luxurious dessert.

Damn... I have to get you to write my copy DC.

 

[PDX Dopesmoker]

Trichomes evolved to prevent frost from forming directly on the flowers, so you want cold temps for the last couple weeks

 

[MIhomegrown]

I grow as little 'plant' as possible. I get almost zero stretch, so plants are vegged to size first. My goal is to grow the minimal structure necessary, to hold the maximum number of terpene/cannabinoid rich trichomes.

Incoming air: 68F/20C
Max Canopy temp: 70F/21C
Incoming RH: 20'ish

Frangible, terpene and cannabinoid rich cannabis with very little stem content. Flowers you can crush between your thumb and finger with a gentle pressure. A center stem which easily separates from the frosty, crumbly pile of cannabis flower. Soft, cool temperature smoke, with a smoking experience which is very much like inhaling a luxurious dessert.

Holy smokes! After reading that I had to wipe my mouth and grab a piece of danish. Other than preserving terps have you notice and increase in trichome production with lower temps?

 

[Douglas.Curtis]

Dropping temps and humidity in late flower will have zero effect on increasing trichome production. All of your trichomes have started their development *before* the end of physical flower bulking.

Holy smokes! After reading that I had to wipe my mouth and grab a piece of danish. Other than preserving terps have you notice and increase in trichome production with lower temps?

Thank you, lol, the best runs have me constantly drooling as well.

Increase in trichome production from cold/dry conditions?

Short answer: No.

Long answer: What I see is significantly fewer plant cells growing "underneath the same number of trichomes." So, the more stretch you get during flower formation, the more plant cells you get between trichomes. The cooler and drier the conditions, the less plant growth you get and the flowers have a much higher trichome density.

Does that make it more clear? One of the most amazing upsides is the terpene preservation. I harvest, trim, dry and store at below 70F as much as possible. Huge difference in retained quality.

 

[TychoMonolyth]

Hey DC, how do you grow them small?

 

[Douglas.Curtis]

Hey DC, how do you grow them small?

Grow them small? As in growing small plants for micro-growing? As in smaller plants in general? Smaller trichomes?

My apologies, I'm unable to determine the context of your question. I'm the type who has issues with filling out paperwork, due to the questions seeming very ambiguous to me. lol Not your fault.

In general, cool and dry grows smaller plants. For the same yield as hot/wet, I have to veg longer or use a higher plant count.

 

[Fitzera]

Dropping temps and humidity in late flower will have zero effect on increasing trichome production. All of your trichomes have started their development *before* the end of physical flower bulking.



Thank you, lol, the best runs have me constantly drooling as well.

Increase in trichome production from cold/dry conditions?

Short answer: No.

Long answer: What I see is significantly fewer plant cells growing "underneath the same number of trichomes." So, the more stretch you get during flower formation, the more plant cells you get between trichomes. The cooler and drier the conditions, the less plant growth you get and the flowers have a much higher trichome density.

Does that make it more clear? One of the most amazing upsides is the terpene preservation. I harvest, trim, dry and store at below 70F as much as possible. Huge difference in retained quality.

In other words, are you implying that the plant will only produce a set amount of trichomes regardless of plant size? So a smaller plant will in turn have a higher percentage of trichomes in a given size sample versus a larger plant?

 

[aridbud]

I liken it to growing tomatoes. Each mimics best time to grow/thrive. Plant tomatoes too soon, soil temps dwarf normal growth...same with autos (my illustration).

Pluck both at optimal conditions. 'o)

 

[Douglas.Curtis]

In other words, are you implying that the plant will only produce a set amount of trichomes regardless of plant size?

I believe what's most important is the amount of stretch between the time trichomes first begin forming, and the time the last trichomes begin forming. Once all trichome sites have been established, continued stretching will only decrease their density per square area.

So a smaller plant will in turn have a higher percentage of trichomes in a given size sample versus a larger plant?

Starting with two clones of the same mum. If the temp/RH is dropped or raised on one clone, as soon as the last trichomes have begun forming on both, you will see a difference in plant size. The cool/dry grown plant will be smaller, and have the higher density of trichomes per square area.

Make sense?

 

[TychoMonolyth]

Grow them small? As in growing small plants for micro-growing? As in smaller plants in general? Smaller trichomes?

My apologies, I'm unable to determine the context of your question. I'm the type who has issues with filling out paperwork, due to the questions seeming very ambiguous to me. lol Not your fault.

In general, cool and dry grows smaller plants. For the same yield as hot/wet, I have to veg longer or use a higher plant count.

My fault. I'm in the Dominican republic and have been high for 48 hours. Seems my communication skills have been affected.

And yes, I have seeds to bring home

 

[Fitzera]

I believe what's most important is the amount of stretch between the time trichomes first begin forming, and the time the last trichomes begin forming. Once all trichome sites have been established, continued stretching will only decrease their density per square area.


Starting with two clones of the same mum. If the temp/RH is dropped or raised on one clone, as soon as the last trichomes have begun forming on both, you will see a difference in plant size. The cool/dry grown plant will be smaller, and have the higher density of trichomes per square area.

Make sense?

It does makes sense, thank you for explaining. That's interesting. I'll keep this in mind as I observe the plants I grow in the years to come and make notes.

Upon revisiting my memories, I recall thinking to myself on more than one occasion that the small buds I observed that were so loaded with trichomes appeared much less frosty weeks later after they had grown further.

 

[Douglas.Curtis]

It does makes sense, thank you for explaining. That's interesting. I'll keep this in mind as I observe the plants I grow in the years to come and make notes.

Upon revisiting my memories, I recall thinking to myself on more than one occasion that the small buds I observed that were so loaded with trichomes appeared much less frosty weeks later after they had grown further.

Bingo! Hit the nail on the head.

 

[CannaRed]

Like a balloon with polka dots. If you inflate the balloon the space between the dots increase. Amount of dots stay the same.

Ive often wondered if this is the case.

The way you explain it with the "stretch" between first trichome developement, and final is interesting.

When are you seeing an end of new trichome developement? How many days in?
I'm guessing it's strain dependant.

What light do you bloom with d.c.?

 

[Douglas.Curtis]

I like the balloon analogy, it mirrors the effect of adding plant cells rather well. As for "the end of trichomes beginning to form," it's definitely strain dependent, and I've not taken the time to determine this exactly. Very good question, and one I'd like to know the answer to myself in more detail.

The last 15+ years I've been using HPS for bloom lighting. I'm done with HPS/HID, except where I need heat during a cold grow. When the LED spectrum is close to CMH or better, my limited experiences with LED are already making HID look silly as an option.