Tips of fan leaves turning purple

[Safe Gardener]

Hi guys and gals. Anyone have any thoughts on these fan leaves? Plant is 33 days in flower.

 

[mr.brunch]

Cool temps?

 

[microbe621]

lumiere trop proche..?

 

[Safe Gardener]

Cool temps?

To be honest I haven’t been monitoring temps this round but I’d be surprised if they are getting below 65f during light out. I’ll get a thermometer/hydrometer in there tonight.

 

[Safe Gardener]

lumiere trop proche..?

I had to translate that one. But light being too close is a definite possibility. The light I’m using for this round is slightly more powerful. 50 watts of LED sq/ft where I was closer to 40 watts LED sq/ft before. Also this round of flower the light is probably 6” closer to the canopy.

 

[Safe Gardener]

Some googling suggested a phosphorus deficiency due to lack of drainage. Could cause purpling of leaves. I’m give the soil a good flush with the next watering.

 

[mr.brunch]

Some googling suggested a phosphorus deficiency due to lack of drainage. Could cause purpling of leaves. I’m give the soil a good flush with the next watering.

If it’s lack of drainage I wouldn’t flush- they may be waterlogged if they’re not draining.
Maybe try repotting or raising pots slightly off the ground to allow them to drain better?
I’m guessing they’re in soil?

 

[Ca++]

I'm thinking P, but something is rattling around in my head. If it drops out, I will pop back.

 

[Safe Gardener]

If it’s lack of drainage I wouldn’t flush- they may be waterlogged if they’re not draining.
Maybe try repotting or raising pots slightly off the ground to allow them to drain better?
I’m guessing they’re in soil?

Flushing might still be the wrong idea, but I didn’t want to do it because of lack of drainage. More because of my lack of watering. I frequently let my plants dry out to the point of wilting. Not as a growing technique (though I do think stressing the plant can tell you a good bit about it) but as I get busy and they are down on the priority list. I was thinking a hearty watering might clean them out a bit? Right now I’m watering about 2/3-3/4 gallon every few days.

 

[Ca++]

Is that like a model railway cannabis plant or something?

 

[Safe Gardener]

Is that like a model railway cannabis plant or something?

This one had been around for a while.

 

[TanzanianMagic]

Hi guys and gals. Anyone have any thoughts on these fan leaves? Plant is 33 days in flower.

1. Cool temperatures.

It is October, after all. And...

2. Nitrogen deficiency

Flowering plants need more nitrogen.

 

[Ca++]

To be honest I haven’t been monitoring temps this round but I’d be surprised if they are getting below 65f during light out. I’ll get a thermometer/hydrometer in there tonight.

Daytime temps would be interesting. The signs are at the upper extremes of the plants, yet those in question, are mobile elements. This strongly suggests an environmental issue. These signs are more related to outdoor plants than indoor, which offers more clues

 

[Creeperpark]

Hi guys and gals. Anyone have any thoughts on these fan leaves? Plant is 33 days in flower.

Real Cool temps during the night time and warm days.

 

[VerdantGreen]

I had to translate that one. But light being too close is a definite possibility. The light I’m using for this round is slightly more powerful. 50 watts of LED sq/ft where I was closer to 40 watts LED sq/ft before. Also this round of flower the light is probably 6” closer to the canopy.

I would back the light off a little, LED's are strong these days and they may be getting too much light and struggling to keep up nutrient delivery to match... Always use calmag with modern LED's too.
If at the end of the lights -on period the leaves are curling down as if they are trying to avoid the light then that is a clue... another possibility is damage to roots from fungus gnat larvae or similar, if the soil has stayed on the wetter side through the grow then that encourages them more. They want to dry out a bit between watering
VG