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Tips of fan leaves turning purple
- Thread starter Safe Gardener
- Start date
microbe621
Member
lumiere trop proche..?
Safe Gardener
Active member
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
Active member
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
Active member
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?
Safe Gardener
Active member
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.
Attachments
Safe Gardener
Active member
1. Cool temperatures.
It is October, after all. And...
2. Nitrogen deficiency
Flowering plants need more nitrogen.
Ca++
Well-known member
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
Real Cool temps during the night time and warm days.
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
Safe Gardener
Active member
Batteries replaced, I’ll have a high and low temp tomorrow. I run lights on 5PM -5AM, If I were to guess I’d say high temps with lights on is no more than 80F. Will update after a day with the thermometer/hydrometer in the tent. Air movement is less than I’ve provided in the past also. I’m only relying on air exchange from the 4” duct fan feeding my DIY 5 gallon carbon scrubber. Maybe add a fan in the tent?
Safe Gardener
Active member
I’m going to check daily highs and lows now that I’ve got new batteries in my thermometer hydrometer. I don’t think there have been any extremes though. Maybe 50’s as a low a few times and low 80’s as a high.
Safe Gardener
Active member
Back the light off as in turn it down to 80% from the 100% it’s currently set at or move the light up. I might be able to move it 3-5”.
I didn’t mention it but I usually (as in most of the time add 5-6ml cal-mag per gallon.
I’ll have to check the leaves at lights on next chance I get.
These roots have been through a lot. This plant lived in 1/2gal pot for over a year. I “pruned” the roots and added new soil a few times before finally transplanting to the current pot.
Drying out isn’t an issue here. I mentioned they go to wilting on occasion because I am a day or two late on a watering.
Thank you for the suggestions.
Either or both, as it will reduce the light intensity.
Were the plants growing healthy after your final transplant, before you put them into flower? (or in early flower) ? if not then that may have compromised them a bit. as would being completely rootbound before you transplanted them.
VG
Safe Gardener
Active member
I’ll know daily high and low temps soon. Just replaced the batteries in the thermometer/hydrometer.
I’d have expected the soil mix to be a little heavy on the nitrogen but I can add some if they continue to yellow.
