Taco shaped leaves

Hi guys been a while since I've been on here but need some help with my room.
Setup is
4x600 watt hps (rooms 3mx4m)
Planted in Canna Terra professional mix
Vented lights
Vented room
Lights around 70 cm from plants
Room temp 26-30 degrees ( depending on how hot it is outside but mostly around 28 degrees
Plants receive about 1 litres of water a day, depending on how heavy the pots are, I'm very careful about over watering.
Ppm level of soil 6.5, ppm of watering 6.5.
The issue I'm having is I'm getting taco shaped leaves on my plants. I've been adding Epsom salts to correct thinking it was a magnesium deficiency but that has not really helped and other plants are starting to experience the same issue.
From what I know this normally happens for 3 reasons 1) heat stress lights too close or fan blowing hot air onto leaves.( ruled this out as the tops of plants are fine the Taco shaped seems to start half way down the plant on older leaves.
2) magnesium deficiency ( been adding magnesium to my water mix and have cut right back on nutrients as not to get any soil lock up)
3) plant genetics ( grown this strain for years never an issue)
Nothing I seem to do is working. I've grown this same strain for years in the same setup in hotter conditions with no problems so I'm ruling out the room. It's has to be 1) water quality? Ppm is 6.5 out of the tap. 2) soil new packaging but the grow shop guy says it's the same as always( professional grade quality from canna)
I will try to upload some photos but the sites having some problems. The plants are 3 weeks into flowering.
Cheers in advance

30c is a little too warm for an indoor grow. try to get the temp down, no higher than 23c would be better. see what happens. if they continue to taco, you might be adding too much nutrients to the soil. go easy on adding nutrients in soil as you don't know how much is retained by dense soil over time. you don't have to feed every time you water or even close to it. people think that a feeding schedule, like water, feed, water is a good idea, then they come here saying they have problems. don't feed too much.

polishpollack said:

30c is a little too warm for an indoor grow. try to get the temp down, no higher than 23c would be better. see what happens. if they continue to taco, you might be adding too much nutrients to the soil. go easy on adding nutrients in soil as you don't know how much is retained by dense soil over time. you don't have to feed every time you water or even close to it. people think that a feeding schedule, like water, feed, water is a good idea, then they come here saying they have problems. don't feed too much.

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hi thanks for the advise but I don't think it's heat related because even my mother plant under a flu has started to show the same thing. Also haven't feed them anything other than a bit of epsons salt in water with a ph of 6.5 and only when the plants need water for the last 1-2 weeks, they are raised up so any excess drains away. That's why I'm stumped? I'm no newbie being doing this successfully for 8-10 years and never lost a crop or had this issue before if anything I use less nutrients than I did before as I found out that they only need half to a quarter of what the labels actually say and it's worked fine for me in the past with this exact same stain. Looking for ways to fix cause I've been feeding no nutrients with just Epsoms salt for the past week has not made any difference just got worse. I only water when I pick the pot up and it feels light so not overwatering have I got some sort of nutrient lockout? But how do I fix it tried letting dry out that did not work. Should I invest in some sort of plant fix it up food? Thanks for your help any other ideas peoples? Cheers

Taco or curling of leaves is usually the result of hi temps, not a nutrient problem.

Low RH with a lamp that's too close?

please only take pics of plants in white light, not sodium. what you have there looks like the result of room temp that's too warm. it's the air temp that matters, not so much what light they're under.

Taco leafs are almost always heat related. The other low percentage is usually in real late flower and just natural with some strains.

RH to low, Temp to high, light might be to close.

If you can’t get your temps down,
Think about adding CO2 then it’s ok to run hotter temps.
Or run your lights at night, so it’s cooler out side, and your fans don’t have to work as hard. Or use a bigger fan.

If temps/rh is good then the plant is too close to the light.

Hi guys
Quick update, I took on board what everyone said and made some changes but still an issue that I'm 100% sure is not heat related.
Room temp lights off during day time 19.5 degrees and 65% humidity/
Room temp lights on at night 21.5 degrees humidity 75%
I added a new exhaust fan to suck more fresh air into the room and am also taking the hot air out.
My lights are air cooled ( I can nearly touch the glass without getting too hot) plants are at least 75-100 cm below the lights. All this does not add up to heat stress! I have run this strain in 30 degree temps same room no problem.
PH soil and nutrients levels are perfect and the plants are not overfed.
Two other things I forgot to mention
1) sprayed with mite rid 4 weeks ago with lights off. Turned lights back on after 10 hours.
2) cleaned my glass inside and out with window cleaning spray( cool tube lights)
Really looking for some different answers as I'm confident it's not a heat thing even though it sounds like it.

Couple of the plants have turned a really light green and are tacoing leaves no sign of burn on the leaves just really light green and taco leaves.
I have been adding a seaweed mix to strengthen the plant leaves but no improvement at all probably got worse. Looking for an expert opinion I will provide new photos tomorrow with the room lights off so people can see better. If someone can find a fix I'm willing to pay a reward!!!!!

hells canyon genetics said:

Taco leafs are almost always heat related. The other low percentage is usually in real late flower and just natural with some strains.

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Hi mate I added some more info really looking for some ideas on how to fix cause heat does not seem to be it and I've grown this strain for 3 years off the same mother ( from seed) with no issues before I have a mate growing the same at the moment in pretty much the same conditions.
Cheers

whats the RH in your room? you said it gets up to 30C...are you at around 55-60% rh? i actually don't recommend that high RH during flower, i like to stick around 30%, but you get a little leaf curl at 30%...you just don't get pm or bud rot

Roger A. Shrubber said:

whats the RH in your room? you said it gets up to 30C...are you at around 55-60% rh? i actually don't recommend that high RH during flower, i like to stick around 30%, but you get a little leaf curl at 30%...you just don't get pm or bud rot

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Hi mate
Thx for your reply first. Room temps are now down to 21.5 degrees during lights on humidity is around 70%. Lights off 19.5 humidity 40%.
It's a well vented room as when lights are on temps only increases by 2 degrees. Plants are at least 1metre away from lights. I washed the leaves with warm water tonight just in case there was any left over miterid left on the leaves I treated the plants 3 weeks ago with lights off giving them a good spay( I might have left the fan on in the room) Really starting to think this is the issue as new leaf does not seem to be affected. Just strange it's still having an effect on the plants still. Hoping a good rinse with Luke warm water might help. With the conditions of the room I've all but ruled out heat from lights or warm air as dropping the room by 8.5 deg has not changed anything. Cheers

Taco's can be heat or light related. Usually that is the case.

I have seen some browning/tacoing of leaves from too much pk though, when light/heat is on the upper margin. The symptoms didn't show until I over fed a pk booster accidentally. And then only on certain strains/pheno's.

If you are in soil, it may take a week or more for the change to be noticed, and any effected leaves may not improve, though new growth will look better.

Lowering temps is a good step. Also look at your feed regiment and maybe lighten up on anything you are running hot with.

I have leaves tacoing leaves, color is great it just happened out of no where. As far as lights being too close I just have a small set up with some 60 watt Walmart led grow lights you can touch em and not feel jack so they are pretty close like close close. Think that’s what it is?

Macncheesehaze said:

I have leaves tacoing leaves, color is great it just happened out of no where. As far as lights being too close I just have a small set up with some 60 watt Walmart led grow lights you can touch em and not feel jack so they are pretty close like close close. Think that’s what it is?

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tacoing is usually a response to either too much light, or too much air flow/low humidity....if you're lights aren't too strong, it's probably either too windy, or you rh is too low, or both. don't have fans blowing directly on your plants, aim them at the wall behind the plants, so they get the backwash. if you have low RH, go get a cheap cool mist humidifier, start it on low, and slowly turn it up over a couple of days till your plants start to respond.

Roger A. Shrubber said:

tacoing is usually a response to either too much light, or too much air flow/low humidity....if you're lights aren't too strong, it's probably either too windy, or you rh is too low, or both. don't have fans blowing directly on your plants, aim them at the wall behind the plants, so they get the backwash. if you have low RH, go get a cheap cool mist humidifier, start it on low, and slowly turn it up over a couple of days till your plants start to respond.

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Yeah it’s gotta be the rh

I'm having the same issue.
10ft x 20ft grow tent, temp is usually 75-82 and RH is 60-70. I've got 36 plants in the room of 10 different strains and only 3 of them (all Orange Sherbert) are showing this severe taco effect. 2 of them are severe and 1 is borderline. They're middle of the road height so I wouldn't think it's heat stress or other plants would show the same thing. However, they are closest to a 16" oscillating fan. Taco leaves are on all new growth all over the plant, not just close to the fans.

I noticed the problem a week ago and moved 2 of the plants away from the fan, cut down on nutes (flushed a couple gallons of water through the soil and skipped 2 nute feedings). PH is 6.5 input and runoff. 1 plant looks mildly better, 1 looks worse and the 3rd one that was slightly tacoing is still right there. I'm stumped.

Near Fan - Noticed the problem


1 week later (away from fan and water flush)

POSTIE said:

Hi guys been a while since I've been on here but need some help with my room.
Setup is
4x600 watt hps (rooms 3mx4m)
Planted in Canna Terra professional mix
Vented lights
Vented room
Lights around 70 cm from plants
Room temp 26-30 degrees ( depending on how hot it is outside but mostly around 28 degrees
Plants receive about 1 litres of water a day, depending on how heavy the pots are, I'm very careful about over watering.
Ppm level of soil 6.5, ppm of watering 6.5.
The issue I'm having is I'm getting taco shaped leaves on my plants. I've been adding Epsom salts to correct thinking it was a magnesium deficiency but that has not really helped and other plants are starting to experience the same issue.
From what I know this normally happens for 3 reasons 1) heat stress lights too close or fan blowing hot air onto leaves.( ruled this out as the tops of plants are fine the Taco shaped seems to start half way down the plant on older leaves.
2) magnesium deficiency ( been adding magnesium to my water mix and have cut right back on nutrients as not to get any soil lock up)
3) plant genetics ( grown this strain for years never an issue)
Nothing I seem to do is working. I've grown this same strain for years in the same setup in hotter conditions with no problems so I'm ruling out the room. It's has to be 1) water quality? Ppm is 6.5 out of the tap. 2) soil new packaging but the grow shop guy says it's the same as always( professional grade quality from canna)
I will try to upload some photos but the sites having some problems. The plants are 3 weeks into flowering.
Cheers in advance

Click to expand...

I had the same problem on one outdoor plant but, because it was only happening to one plant and not the others, I knew it wasn't a nutrient deficiency. I looked carefully at the leaves and couldn't find any sign of insect damage or ovipositioning. I figured that the only thing left was something eating the roots. It made sense that the leave were shriveling because they weren't getting enough water because the damaged roots weren't absorbing it. I applied beneficial nematodes on 6/19 and by 6/23, problem solved. The old taco leaves looked about the same but the new growth looks perfect. Hope that helps.

P.S. Excessive heat didn't make sense either because only one plant was affected and they are all getting the same amount of sun.