Leaves yellowing and falling off in flower

ddeck96

ddeck96

Well-Known Member
Right after my plant stopped stretching, the leaves started to turn yellow, and then a pale white color, then they fall off, working its way up from the bottom it seems. The tips of the yellow leaves seem a little blackish brown, and some of the tips are curling up/down. I thought it might be nitrogen def, so I upped my nutes, but I’m not totally sure if it’s helping.
Ph is good, measured 6.3 this morning
Strain is LSD autoflower by fast buds (57 days old) in fox farm ocean forest/happy frog mix
Rh is pretty steady at 40-45
Temps fluctuate between 78-82 degrees (although it has gotten up to 84 on hot days)

Any ideas what it could be and how to correct it? A bit worried here. Thanks. Pics below. (Also it’s slightly more yellow than it appears in pic)
 

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Budzbuddha

Budzbuddha

Well-Known Member
Yeah plant pulled whatever nitro it could from itself for stretch...thats why some growers keep a last veg feed going until stretch is over before introducing bloom nutes.

Completely yellow has lost pretty much its job of photosynthesis. You “ could “ help plant with a recharge - add a large scoop of FFOF to top soil and ph water in ... this is like a tea / soil drench .
FFOF can exhaust after 6 weeks or if you have very hungry strains. Even if you do this for remainder of grow at intervals , you will be able to keep plant pulling from the same medium ( and amendments ) that it is already used too.

Based on your grow date ... i would say you still have about 3 weeks ( + or - ) as most autos can go 70 days or so .


What nutes are you using?
And were you using them prior to this happening?
 
Dontjudgeme

Dontjudgeme

Well-Known Member
I would up your ph to 6.5-7. And it’s my understanding that bottle feeding isn’t necessary using FFOF. It has all the nutrients your plants need. What type of water are you using? Tap, distilled, RO. If not tap, get some calmag and add it to your water feeding. I’d get some blackstrap molasses while you’re at it, make sure it’s unsulphured if you do. It held with the micros in your soil.
 
ddeck96

ddeck96

Well-Known Member
Yeah I just thought it was weird cuz it didn’t really yellow til it had basically stopped stretching. I had also continued veg nutes through stretch (with a slight addition of bloom). I’m using Armor Si, CalMag, Flora trio, liquid Koolblood, Floralicious plus and Rapidstart. And yes, bottle feeding isn’t necessary with FFOF, but only for a certain period of time. After giving it many waterings you end up washing out some of the strength of the soil, so eventually you end up needing to bottle feed.
I’ve had some autos run 90+ days, I reckon I’ve got a good month left in this one. Since it’s lost a fair amount of leaves and some are yellowing do you think it’s gonna have an effect on the plants ability to produce buds? Will definitely try top dressing the soil with some more FFOF tho, thanks!
 
Renfro

Renfro

Well-Known Member
ddeck96 said:
Ph is good, measured 6.3 this morning
Click to expand...
Is this the root zone pH or the input pH? How was it quantified? It is common for the medium to end up with a lower pH that you input. Just something to check for.

Budzbuddha said:
Yeah plant pulled whatever nitro it could from itself for stretch...thats why some growers keep a last veg feed going until stretch is over before introducing bloom nutes.
Click to expand...
How does one determine when stretch starts with an auto? I would think that the common approach would be feeding with a veg feed until you see it produce flower. I never grew autos though. Is he even feeding or just using the soil that has become exhausted?
 
ddeck96

ddeck96

Well-Known Member
Renfro said:
Is this the root zone pH or the input pH? How was it quantified? It is common for the medium to end up with a lower pH that you input. Just something to check for.


How does one determine when stretch starts with an auto? I would think that the common approach would be feeding with a veg feed until you see it produce flower. I never grew autos though. Is he even feeding or just using the soil that has become exhausted?
Click to expand...

Pretty sure I checked the root zone PH. I waited until the nutes were pretty much absorbed from the last feed and ran 6.20 PH Ro water through and checked the run off, It came out at 6.25 PH, so I’m estimating the Ph to be around 6.30. Is that correct? And about the stretch, I’m not really sure lol. I’ve just assume it starts when it shows a few pistils and really starts to take on growth fast. Then I assume it’s stopped when the growth stops and the buds start to form and get bigger.
 
Renfro

Renfro

Well-Known Member
ddeck96 said:
And about the stretch, I’m not really sure lol.
Click to expand...
With photos the first 10 - 20 days of 12/12 is stretch, then it starts making bud. With autos I wouldn't have a clue when that phases starts, the key would be as you said, wait for it to stop going up and to start making buds, then switch to a bloom feed.

Whats your feed EC? Hopefully it's up around 2 - 2.2
 
Renfro

Renfro

Well-Known Member
ddeck96 said:
ran 6.20 PH Ro water through and checked the run off, It came out at 6.25 PH, so I’m estimating the Ph to be around 6.30. Is that correct?
Click to expand...
It could be correct, I never really trust runoff. For example I have seen water go in at 6.5 and come out at 6.0 but the medium tested at 5.2 with a meter.
 
ddeck96

ddeck96

Well-Known Member
Renfro said:
With photos the first 10 - 20 days of 12/12 is stretch, then it starts making bud. With autos I wouldn't have a clue when that phases starts, the key would be as you said, wait for it to stop going up and to start making buds, then switch to a bloom feed.

Whats your feed EC? Hopefully it's up around 2 - 2.2
Click to expand...
I’ll prob buy a meter then. I assume you mean one with a spear tip that penetrates the soil to take measurements?

and Nah I’ve been feeding around 1.6 EC cuz autos can be sensitive. I’ll try raising it to 2.0 and see how it does. Thanks
 
Dontjudgeme

Dontjudgeme

Well-Known Member
ddeck96 said:
Yeah I just thought it was weird cuz it didn’t really yellow til it had basically stopped stretching. I had also continued veg nutes through stretch (with a slight addition of bloom). I’m using Armor Si, CalMag, Flora trio, liquid Koolblood, Floralicious plus and Rapidstart. And yes, bottle feeding isn’t necessary with FFOF, but only for a certain period of time. After giving it many waterings you end up washing out some of the strength of the soil, so eventually you end up needing to bottle feed.
I’ve had some autos run 90+ days, I reckon I’ve got a good month left in this one. Since it’s lost a fair amount of leaves and some are yellowing do you think it’s gonna have an effect on the plants ability to produce buds? Will definitely try top dressing the soil with some more FFOF tho, thanks!
Click to expand...
The yellowing of the leaves won’t have any effect on bud production. My leaves start to yellow when I’m close to harvest, that’s nothing more than the plant getting all the nitrogen it can by feeding off of itself. Nothing to be too worried about because we intentionally deprive the plant of nitrogen during flower anyway. Now all of your leaves turning yellow is a different story, which doesn’t seem to be your case. I grow both organically and bottle feed. I see more of the yellow leaves on my organic grows than I do my bottle fed grows, reason being, the liquid Nutes still have a little nitrogen in it, something my amendments don’t have. Only way i can make sense of it.
 
Mr. Cheetah

Mr. Cheetah

Well-Known Member
Budzbuddha said:
Yeah plant pulled whatever nitro it could from itself for stretch...thats why some growers keep a last veg feed going until stretch is over before introducing bloom nutes.

Completely yellow has lost pretty much its job of photosynthesis. You “ could “ help plant with a recharge - add a large scoop of FFOF to top soil and ph water in ... this is like a tea / soil drench .
FFOF can exhaust after 6 weeks or if you have very hungry strains. Even if you do this for remainder of grow at intervals , you will be able to keep plant pulling from the same medium ( and amendments ) that it is already used too.

Based on your grow date ... i would say you still have about 3 weeks ( + or - ) as most autos can go 70 days or so .


What nutes are you using?
And were you using them prior to this happening?
Click to expand...
agree, veg nutes for the first to weeks since start shooting hairs, big up @Budzbuddha
 
ddeck96

ddeck96

Well-Known Member
Awesome. Thanks all who have taken the time to comment and help me out! Much appreciated!!!!
 
Renfro

Renfro

Well-Known Member
ddeck96 said:
I assume you mean one with a spear tip that penetrates the soil to take measurements?
Click to expand...
The analog ones lie and are useless. The bluelab digital soil pH meter is a good one, it will measure liquids also. Make sure to poke the hole in the soil with the probe cover, then gently insert the probe. Always store with the KCl solution in the cap or the probe life is in jeopardy.

For EC you just measure the liquids, the blue lab truncheon is as reliable as they come.
 
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