Top leaves are yellowing in flowering-Nutrient deficiency or excess or lock out

First this is my first grow. I have no experience at all.

I am growing 3 Auto Haze plants. I think I am nearing harvest.
Many Trichomes appear cloudy. None are amber.
2023_01_21_09_59_27_510.jpg

They sprouted 11/3/22, so I am about 11 weeks out

A few days ago I noticed light green leaves on two of the plants and darker on the other.
PXL_20230118_112140396[1].jpg
I posted this as a question.
Some thought it was a phenotype difference.

It seems there is a nutrient problem.
Now one of the plants seems to be much more affected than the other one. The other plant looks is getting a bit lighter.
PXL_20230121_123525239.jpgPXL_20230121_123248243.jpgPXL_20230121_140231003.PORTRAIT.jpgPXL_20230121_123940444.jpgPXL_20230121_205604008.jpg
Watering has went well.
Ph around 6.7
Rh 45-55%
Temp day 72-80 night 62-70F

Soil is a mix of perlite and used flower soil and Nature's Living Soil
I use Fox Farms Trio about half recommended dose.
I have supplemented with 1/2 tsp Epson salt, tbsp wood Ash and 2ml Mg/cal/ gallon for a few feeds during flower.

Yellowing is mostly upper leaves and some mid leaves. Yellowing migrate from tips to base of leaf
Minor burning on the tips.
Stalks are purple but I noticed this months ago and this may be genetics.

Ignore curling of sugar leaves top cola. These also had light stress.

My thoughts are
1. possible Phosphorus excess. I use 2-3 ml/ gallon of PH down which is Phosphoric Acid.
I also gave them about 4 feeds which included tbsp of wood ash in water. This is supposedly 10% Potash which should give K+ and P+. I did read that Phosphorus excess is rare and it is hard to give too much.
2. ? K+ excess for same reason. Maybe the Ash.
a. Lower leafs I think should be involved and are not.
3. Sulfur deficiency
a. I have supplement w Epson salt so I doubt this and also the yellowing appears to begin near tips of leaves and migrate back the opposite of this appearance.
4. Maybe I have a nutrient lock out from salts but I only feed 1/2 dose fox farms 1 or 3 x a week

So far I have done a larger watering with no nutrients to help flush anything.
I didn’t do a real flush because I'm not set up for managing all the run off water and don’t want to lose all nutrients in the soil but I very well may be wrong.
I just gave them all a feed with the recommended Fox farm nutrients which is twice the concentration they normally get.

Any one with any ideas?

Do I really need to do a flush with gallons of water and get a shop vac?

Should I ride it out?

Should I harvest soon?
 

whelk

Well-Known Member
I don't grow autos but I wouldn't worry. You are close to harvest and plants get yellow often. Lot of great weed I've grown many leaves were yellow all the way through. Also, most people say flushing is unnecessary
 

sh0wtime

Well-Known Member
I don't grow autos but I wouldn't worry. You are close to harvest and plants get yellow often. Lot of great weed I've grown many leaves were yellow all the way through. Also, most people say flushing is unnecessary
I do not agree with the flushing, tho yellowing naturally happens his plants look abit overfed.
Harvest depends on the trichs, my friend - your opinion matters, not mine check 'em out under a lupe and decide!
 
Thank you. I have not done a real flush and just gave a little bit more water than normal during my last watering without any nutrients. Today I did give them nutrients and hopefully I'm not completely overfeeding them. But thanks. I guess we will see what happens. The first photo shows the trichomes. I took this with a 10 times microscope. I bought off Amazon and this links with my phone. I think they are showing mostly cloudy trichomes but I am not too experienced.
 
First this is my first grow. I have no experience at all.

I am growing 3 Auto Haze plants. I think I am nearing harvest.
Many Trichomes appear cloudy. None are amber.
View attachment 5251128

They sprouted 11/3/22, so I am about 11 weeks out

A few days ago I noticed light green leaves on two of the plants and darker on the other.
View attachment 5251121
I posted this as a question.
Some thought it was a phenotype difference.

It seems there is a nutrient problem.
Now one of the plants seems to be much more affected than the other one. The other plant looks is getting a bit lighter.
View attachment 5251122View attachment 5251123View attachment 5251124View attachment 5251125View attachment 5251126
Watering has went well.
Ph around 6.7
Rh 45-55%
Temp day 72-80 night 62-70F

Soil is a mix of perlite and used flower soil and Nature's Living Soil
I use Fox Farms Trio about half recommended dose.
I have supplemented with 1/2 tsp Epson salt, tbsp wood Ash and 2ml Mg/cal/ gallon for a few feeds during flower.

Yellowing is mostly upper leaves and some mid leaves. Yellowing migrate from tips to base of leaf
Minor burning on the tips.
Stalks are purple but I noticed this months ago and this may be genetics.

Ignore curling of sugar leaves top cola. These also had light stress.

My thoughts are
1. possible Phosphorus excess. I use 2-3 ml/ gallon of PH down which is Phosphoric Acid.
I also gave them about 4 feeds which included tbsp of wood ash in water. This is supposedly 10% Potash which should give K+ and P+. I did read that Phosphorus excess is rare and it is hard to give too much.
2. ? K+ excess for same reason. Maybe the Ash.
a. Lower leafs I think should be involved and are not.
3. Sulfur deficiency
a. I have supplement w Epson salt so I doubt this and also the yellowing appears to begin near tips of leaves and migrate back the opposite of this appearance.
4. Maybe I have a nutrient lock out from salts but I only feed 1/2 dose fox farms 1 or 3 x a week

So far I have done a larger watering with no nutrients to help flush anything.
I didn’t do a real flush because I'm not set up for managing all the run off water and don’t want to lose all nutrients in the soil but I very well may be wrong.
I just gave them all a feed with the recommended Fox farm nutrients which is twice the concentration they normally get.

Any one with any ideas?

Do I really need to do a flush with gallons of water and get a shop vac?

Should I ride it out?

Should I harvest soon?
A few pictures from this morning after ordering about 20 hours ago
 

Attachments

Grow Monster

Well-Known Member
Yep autos do that boating with leaves when overfed. No need to flush just cut back but still feed regular. Pluck the large fans that are yellowing. At this point in its life they're using alot of energy that could be used elsewhere. U got plenty of leaves for photosynthesis. Looks like maybe 3wks or so til finish. U can't fix damaged leaves so just ride it out. U gd trust me. Should be nice harvest. For a newbie you're doing a stellar job.
 
Yep autos do that boating with leaves when overfed. No need to flush just cut back but still feed regular. Pluck the large fans that are yellowing. At this point in its life they're using alot of energy that could be used elsewhere. U got plenty of leaves for photosynthesis. Looks like maybe 3wks or so til finish. U can't fix damaged leaves so just ride it out. U gd trust me. Should be nice harvest. For a newbie you're doing a stellar job.
Thanks Grow Monster! Very encouraging!
 

Southernontariogrower

Well-Known Member
First this is my first grow. I have no experience at all.

I am growing 3 Auto Haze plants. I think I am nearing harvest.
Many Trichomes appear cloudy. None are amber.
View attachment 5251128

They sprouted 11/3/22, so I am about 11 weeks out

A few days ago I noticed light green leaves on two of the plants and darker on the other.
View attachment 5251121
I posted this as a question.
Some thought it was a phenotype difference.

It seems there is a nutrient problem.
Now one of the plants seems to be much more affected than the other one. The other plant looks is getting a bit lighter.
View attachment 5251122View attachment 5251123View attachment 5251124View attachment 5251125View attachment 5251126
Watering has went well.
Ph around 6.7
Rh 45-55%
Temp day 72-80 night 62-70F

Soil is a mix of perlite and used flower soil and Nature's Living Soil
I use Fox Farms Trio about half recommended dose.
I have supplemented with 1/2 tsp Epson salt, tbsp wood Ash and 2ml Mg/cal/ gallon for a few feeds during flower.

Yellowing is mostly upper leaves and some mid leaves. Yellowing migrate from tips to base of leaf
Minor burning on the tips.
Stalks are purple but I noticed this months ago and this may be genetics.

Ignore curling of sugar leaves top cola. These also had light stress.

My thoughts are
1. possible Phosphorus excess. I use 2-3 ml/ gallon of PH down which is Phosphoric Acid.
I also gave them about 4 feeds which included tbsp of wood ash in water. This is supposedly 10% Potash which should give K+ and P+. I did read that Phosphorus excess is rare and it is hard to give too much.
2. ? K+ excess for same reason. Maybe the Ash.
a. Lower leafs I think should be involved and are not.
3. Sulfur deficiency
a. I have supplement w Epson salt so I doubt this and also the yellowing appears to begin near tips of leaves and migrate back the opposite of this appearance.
4. Maybe I have a nutrient lock out from salts but I only feed 1/2 dose fox farms 1 or 3 x a week

So far I have done a larger watering with no nutrients to help flush anything.
I didn’t do a real flush because I'm not set up for managing all the run off water and don’t want to lose all nutrients in the soil but I very well may be wrong.
I just gave them all a feed with the recommended Fox farm nutrients which is twice the concentration they normally get.

Any one with any ideas?

Do I really need to do a flush with gallons of water and get a shop vac?

Should I ride it out?

Should I harvest soon?
my guess is cal lockout. If using city water drop calmag for mag sulphate. Enough cal in water. Too much will cause plant to lockout. Epsom salt is good mag additive at 50 to 75 ppm. Can always spray with Epsom salts also for faster reaction. This is only my opinion. But I'd bet on it. I would ride it out!
 
my guess is cal lockout. If using city water drop calmag for mag sulphate. Enough cal in water. Too much will cause plant to lockout. Epsom salt is good mag additive at 50 to 75 ppm. Can always spray with Epsom salts also for faster reaction. This is only my opinion. But I'd bet on it. I would ride it out!
I am wonderi
my guess is cal lockout. If using city water drop calmag for mag sulphate. Enough cal in water. Too much will cause plant to lockout. Epsom salt is good mag additive at 50 to 75 ppm. Can always spray with Epsom salts also for faster reaction. This is only my opinion. But I'd bet on it. I would ride it out!
I think I locked calcium out with too much magnesium as I fed probably 3 to 4 times as much Epson salt as I did Cal mag
 

Grow Monster

Well-Known Member
Nope. Just drop calmag and don't overdo the Epsom salt. To much of a gd thing is bad.
Also put the loupe away til your hairs have all retracted in and turnt burnt orange. When it makes new ones its just your buds way of fattening up.
 

Southernontariogrower

Well-Known Member
I am wonderi

I think I locked calcium out with too much magnesium as I fed probably 3 to 4 times as much Epson salt as I did Cal mag
50 to 75 ppm of epsom isn't much at all. Is a pinch in a 5 gal bucket. How much Epsom you giving them. Outdoors I topdress Epsom pretty heavy but is in veg. Make fruit taste better.eg. tomatoes. So why not bud. I've fed Epsom pretty liberally without issues so my guess is cal lockout. City water? If so can use the mag but Id ditch the calmag. Since ditching calmag I've had less issues personally. I use Epsom every few waterings.
 
50 to 75 ppm of epsom isn't much at all. Is a pinch in a 5 gal bucket. How much Epsom you giving them. Outdoors I topdress Epsom pretty heavy but is in veg. Make fruit taste better.eg. tomatoes. So why not bud. I've fed Epsom pretty liberally without issues so my guess is cal lockout. City water? If so can use the mag but Id ditch the calmag. Since ditching calmag I've had less issues personally. I use Epsom every few waterings.
Thanks. I used a half to a whole teaspoon per gallon for more than 50% of feeds and watering since flowering.
 
Wanted to give everyone an update on how it turned out.

2/13/2023 harvest
2/24 temp 60 RH 62. Temp variable from 58 - 69. RH 48-70

2/25 Trim

Small Plant

Plant 2

Plant 3 (yellow plant)

Total

Dry Bud

97g

105g

100g

202g

Trim

28g

32g

17g

67g


After weighing used 2.5 gms of not carbed Bud and grinded and mixed with Brownie. I figured Brownie neede 40 min at 325F so it should decarb while Brownie is cooking.
I made 1 lb cannabutter from 15 gms of trim and 15 gms of Bud.
During this I sampled a couple hits in the Bong. This is completely uncured so I was expecting it to be harsh. It was wasn't bad. Should improve over the next few weeks. Felt something within 5 minutes.
I then took about 4 rips from my Rogue by Healthy Rips. It had a great taste. Sorry that’s my only adjective this morning. I usually don’t feel much the morning after, but consumption was on the high end yesterday. I will be consuming more from this method.
As the munchies set in I used some leftover butter matted weed, and made a cream cheese and weed Bagel. I only ate half but it hit hard about an hour later.

Some of the things I have learned is
  1. Don’t stress too much at the end of flower. Your plant is dying and it doesn’t look as good as a few weeks before Harvest. (I will still try and avoid nut lock out in the future.)
  2. Don't train Auto's! It stunts them! The plant that got by far the most attention had the lowest harvest weight. (I know some disagree. But I am sure those who do are better and more experienced growers and trainers then me.
  3. Be careful with Epsom salt and go light on salt nutes as it may lock out other nutrients.
  4. If you travel try and get someone to look in on your plants.

Anyway thank you everyone for your input and help with my first grow and new hobby!
 
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