I am week 6 into flowering and half of my plant’s leaves dried out and died. The buds are still a little moist but mostly dried out too. The temps are 78-84 with a small oscillating fan so I don’t think it is heat stress. I’m using 2 HLG 550’s and they are about 10 inches above the canopy. Could that be too close for them? I use a portable AC unit with a inline fan sucking in the cold air and blowing it into the bottom of the tent. I’ve always used this set up and this is the first time this has happened. I am using the Advanced Nutrients line up.
Nutrient Burn or Light Too Close?
- Thread starter raviel
- Start date
New Age United
Well-Known Member
What's your RH, maybe put a bowl of water in the tent or a humidifier if possible.
RH is at 45% I am not sure if that is good enough or not. I live in New Mexico so our summers are really dry and hot.
New Age United
Well-Known Member
45% is very dry for those temps, ideally the higher the temps the higher RH you want. I would get a humidifier just a small one and put er in the tent.
Schwagg#12
Well-Known Member
Is that into 5 gallons of water
Yes into 5 gallons of water, sorry should have specified.
OldMedUser
Well-Known Member
Feeding at a way too high level especially this late in flower and from the looks you've been doing it all along.
What you got there is toxic salts buildup, TSB, and a raging case of it as well.
Nothing you can do now but stop feeding altogether and flush some of the excess nutes to slow the buildup.
I've used the AN nutes 3-part with just Big Bud and Rhino Skin for almost 20 years and have had that happen many times until I clued into how our low RH here in northern Alberta made it happen. I never fed as heavy as you are using the max amount and generally used only half with RO water but still got TSB. The plants suck up a lot of extra nutes with low RH and store them in the leaves until it reaches toxic levels around the middle of flower and then they all start going all thick and crispy like yours are doing. Keeps going right into the tiny bud leaves too. Hard water can make it even worse as those minerals in the water are also salts that add to the load.
Never go by the feed charts for any nute maker. They want you to use lots so you will run out faster and have to go buy more sooner.
What all are you using?
What you got there is toxic salts buildup, TSB, and a raging case of it as well.
Nothing you can do now but stop feeding altogether and flush some of the excess nutes to slow the buildup.
I've used the AN nutes 3-part with just Big Bud and Rhino Skin for almost 20 years and have had that happen many times until I clued into how our low RH here in northern Alberta made it happen. I never fed as heavy as you are using the max amount and generally used only half with RO water but still got TSB. The plants suck up a lot of extra nutes with low RH and store them in the leaves until it reaches toxic levels around the middle of flower and then they all start going all thick and crispy like yours are doing. Keeps going right into the tiny bud leaves too. Hard water can make it even worse as those minerals in the water are also salts that add to the load.
Never go by the feed charts for any nute maker. They want you to use lots so you will run out faster and have to go buy more sooner.
What all are you using?
OldMedUser
Well-Known Member
Actually 45% is just about right for late stage flowering. Lower nute levels are what is needed but that should have been happening all along to prevent his issue. I'm often at 20% in the middle of winter in my room.
Adding humidity now might just bring on bud rot to totally finish off those poor girls.
New Age United
Well-Known Member
No it's not too late these plants are extremely resilient. You should be between 68-82 degrees and 40-60% humidity, so at 45% your temps should only be about 72, now you do want higher humidity during veg and lower during flower especially late flower. I actually have my humidity as high as 75% during veg, but aim to keep it between 40 and 60% during flower.
New Age United
Well-Known Member
Ya that's right I was just thinking that his humidity is to low for that temp range. But yes now that hes this far into flower it might not be such a good idea to add humidity good point.Actually 45% is just about right for late stage flowering. Lower nute levels are what is needed but that should have been happening all along to prevent his issue. I'm often at 20% in the middle of winter in my room.
Adding humidity now might just bring on bud rot to totally finish off those poor girls.
Dang I never would have guessed it would have been the nutrients causing that. I will start flushing next watering and hopefully that slows down the crisping. Adding a little more humidity probably won’t hurt either at this point. I am using the AN Grand Master Grow. Next grow I’ll cut all the nutes in half. Thanks for all the great answers/advice guys.Feeding at a way too high level especially this late in flower and from the looks you've been doing it all along.
What you got there is toxic salts buildup, TSB, and a raging case of it as well.
Nothing you can do now but stop feeding altogether and flush some of the excess nutes to slow the buildup.
I've used the AN nutes 3-part with just Big Bud and Rhino Skin for almost 20 years and have had that happen many times until I clued into how our low RH here in northern Alberta made it happen. I never fed as heavy as you are using the max amount and generally used only half with RO water but still got TSB. The plants suck up a lot of extra nutes with low RH and store them in the leaves until it reaches toxic levels around the middle of flower and then they all start going all thick and crispy like yours are doing. Keeps going right into the tiny bud leaves too. Hard water can make it even worse as those minerals in the water are also salts that add to the load.
Never go by the feed charts for any nute maker. They want you to use lots so you will run out faster and have to go buy more sooner.
What all are you using?
OldMedUser
Well-Known Member
Don't add any more humidity. Too late for that and with weakened plants they are going to be susceptible to catching something nasty like botrytis. The dreaded bud rot aka Grey Mold.
I would do an actual flush just to get rid of some excess salts. Soak it good and let it sit for a bit then put an extra gallon at least thru to flush out most of the salts. Still lots in there for the plant to soak up along with the fresh water and make it worse.
Good luck!
Should I use the Flawless Finish or wait off on that? Also should I do flushes during veg or before going into flower?Don't add any more humidity. Too late for that and with weakened plants they are going to be susceptible to catching something nasty like botrytis. The dreaded bud rot aka Grey Mold.
I would do an actual flush just to get rid of some excess salts. Soak it good and let it sit for a bit then put an extra gallon at least thru to flush out most of the salts. Still lots in there for the plant to soak up along with the fresh water and make it worse.
Good luck!
OldMedUser
Well-Known Member
I've never used any flushing agents so can't really advise. Basically they are considered snake oil and don't really do anything other than empty your wallet. They will not remove salts from the plant but may help remove them from the pots tho good old water will do that fine.
If you lower your feed levels you shouldn't have to do flushes at all. If using hard water then lots of runoff at each watering is good to keep minerals in the water from building up in the pots or a bit of a flush every so often.