Jjgrow420
Well-Known Member
OK. I don't think I was looking for an answer on what it was. I was giving some information that included scientists talking about reasons it happens. But thanks?
Is the praying leaves a bad thing or good thing?
- Thread starter AlmightyJumpman
- Start date
Hollatchaboy
Well-Known Member
If you have praying leaves at lights on, and droopy leaves at lights off, it means you're giving it too much light.
Poltrack
Member
Everybody know what is cloning and how to do it. Not everybody know what is a callus and how to boost its formation.
It's a bit the same thing, just the layer you're looking at.
Phototropism is not "fixed", all along the day (24hrs) the plant take different positions. This video show well what happens with healthy plants :
(start at 4:30, the link reboot the video)
It's just basic phyto about sap and cells, nothing fancy or "mysterious".
I'm pretty careful about ChatGPT but I "chatted" with this question:
"What are some of the reasons for the leaves of a cannabis plant drooping at the end of the photoperiod?"
I'd thought it was mainly a turgor issue with light coming in at second place but there could be a variety of issues. What throws me off about blaming PPFD is that I grow plants at DLI's of 70-80 and haven't seen leaves droop. I grow in hydro with temps in the low to mid-80's (in veg).
It "might could" be a combination of factors, I'm thinking.
The text below is from an AI agent. Note that there are no references.
Drooping cannabis leaves at the end of the photoperiod (especially in the light cycle of a 12/12 or 18/6 schedule) are usually not a cause for concern—in fact, they often reflect normal circadian behavior. However, several factors can contribute, ranging from natural rhythms to environmental stress. Here's a breakdown:
1. Circadian Rhythms- Plants droop naturally toward the end of their light cycle as part of their internal clock.
- This is more pronounced in healthy, vigorous plants and typically resolves shortly after lights come back on.
- Similar to how humans wind down at night.
If drooping is excessive, progressively worse, or lingers after lights on, consider these:2. Overwatering
- Roots stay too wet and oxygen-deprived.
- Leaves droop and feel limp.
- Gets worse over time, not just at lights-off.
- Lack of water leads to cell turgor loss.
- Leaves droop and may feel dry or papery.
- Recovers quickly after watering if this is the cause.
- Roots too cold (<65°F) can reduce uptake and cause droop.
- Roots too hot (>75–77°F in hydro) may cause oxygen depletion.
- High PPFD (light intensity) or canopy temperatures (>85°F) can stress plants by day.
- Leaves may droop toward end of photoperiod due to cumulative fatigue.
- High EC can reduce water uptake through osmotic resistance.
- In hydro, poor balance or too frequent feedings can cause this.
- Low humidity or high temps = high VPD → too much transpiration.
- Plant may "close down" and droop to reduce water loss.
What to Check
- Do they perk back up within 1–2 hours of lights on? Normal.
- Do they stay droopy during lights on? Problem.
- Do pots feel heavy or light? Check for over/underwatering.
- Leaf feel: Limp and wet (overwatering) vs. dry and floppy (underwatering).
- Look at root zone temps and light levels. Adjust if excessive.
Let me know your grow setup (media, watering schedule, EC, light intensity, etc.) and I can give you a more tailored diagnosis.
Hollatchaboy
Well-Known Member
I don't normally have a problem with drooping leaves. Normally my plants stay praying all thru lights on. I have had a couple strains, that did droop today's end of light cycle. I just figured it was strain related, and backed off the light some. Usually ends the droop. It could've affected yield and potency though, but I'll never know. LolI'm pretty careful about ChatGPT but I "chatted" with this question:
"What are some of the reasons for the leaves of a cannabis plant drooping at the end of the photoperiod?"
I'd thought it was mainly a turgor issue with light coming in at second place but there could be a variety of issues. What throws me off about blaming PPFD is that I grow plants at DLI's of 70-80 and haven't seen leaves droop. I grow in hydro with temps in the low to mid-80's (in veg).
It "might could" be a combination of factors, I'm thinking.
The text below is from an AI agent. Note that there are no references.
Drooping cannabis leaves at the end of the photoperiod (especially in the light cycle of a 12/12 or 18/6 schedule) are usually not a cause for concern—in fact, they often reflect normal circadian behavior. However, several factors can contribute, ranging from natural rhythms to environmental stress. Here's a breakdown:
1. Circadian Rhythms
- Plants droop naturally toward the end of their light cycle as part of their internal clock.
- This is more pronounced in healthy, vigorous plants and typically resolves shortly after lights come back on.
- Similar to how humans wind down at night.
If drooping is excessive, progressively worse, or lingers after lights on, consider these:
2. Overwatering
3. Underwatering
- Roots stay too wet and oxygen-deprived.
- Leaves droop and feel limp.
- Gets worse over time, not just at lights-off.
4. Root Zone Temperature
- Lack of water leads to cell turgor loss.
- Leaves droop and may feel dry or papery.
- Recovers quickly after watering if this is the cause.
5. Heat or Light Stress
- Roots too cold (<65°F) can reduce uptake and cause droop.
- Roots too hot (>75–77°F in hydro) may cause oxygen depletion.
6. Nutrient Stress / Salt Buildup
- High PPFD (light intensity) or canopy temperatures (>85°F) can stress plants by day.
- Leaves may droop toward end of photoperiod due to cumulative fatigue.
7. VPD Issues
- High EC can reduce water uptake through osmotic resistance.
- In hydro, poor balance or too frequent feedings can cause this.
- Low humidity or high temps = high VPD → too much transpiration.
- Plant may "close down" and droop to reduce water loss.
What to Check
- Do they perk back up within 1–2 hours of lights on? Normal.
- Do they stay droopy during lights on? Problem.
- Do pots feel heavy or light? Check for over/underwatering.
- Leaf feel: Limp and wet (overwatering) vs. dry and floppy (underwatering).
- Look at root zone temps and light levels. Adjust if excessive.
Let me know your grow setup (media, watering schedule, EC, light intensity, etc.) and I can give you a more tailored diagnosis.
StonedGardener
Well-Known Member
One thing is for sure, when praying, they are definitely reducing surface area to light exposure.
