Heat stress?

[Itsasecret]

I have got some tacos at the tops of my plants. Do you think this is heat stress from my lights or something else? Also new growth has turned very bright green over the last couple of days. Thanks in advance 🙂

 

[vostok]

it is heats stress but in truth the air is too dry check your Humidistat,

tho the plant can handle high temps for a short time 2-4 hours dry air twists the leaf margins as such

cool her down, check your Rh hourly keep her 55-65% or until the margins relax

good luck

 

[Itsasecret]

Thanks for the advice, appreciated as always. I do suffer from low RH. It seems to be around 40/45% most of the time. I’ll work on trying to raise it up somehow. I was going to buy a mini humidifier but I was told not to if I have LED lights in my tent? I keep putting damp sponges in there and a bowel/glass of water, which helps a little bit, not a lot though. How else can I raise my RH without adding a humidifier/mister? Or was I misinformed about humidifiers damaging my LED grow light?? I’m confused again 🤷🏼‍♂️😂

 

[JDU]

My RH is holding steady at 42 these days. In the Winter when we run the furnace it has gotten as low as 11 but is usually low 20s.

 

[Jordann]

I guess it depends on the light itself lots of quantum boards are ip67 waterproof so they would be a o k. But even with my blurple lights I've used humidifiers without any problems.

 

[9fingerleafs]

If it’s light driven it’s because the plants closest to the light are requiring more nutrients but that “spiked” look they got (not actually taco leaf) and the yellowing point more to a deficiency. Environment does have an impact but I would start at the roots. It’s drinking the same water? What kind of yellowing? Looks like iron def? What’s the ph you water at? What you feeding?

 

[D.A.A.S.69]

If mine, I'd try raising my lights a little, looks like light bleaching to me ,in flower, you want low humidity, like 30-45percent, especialy if you want hard, dense buds, you don't want high humidity in flower.
Nice plant, good luck.

 

[Itsasecret]

Think I might have a few issues with this plant. I’m thinking it might be a combination of heat stress, overwatering, a possible nitrogen abundance, possibly a phosphorus/potassium and or iron deficiency? Maybe all of these problems together. Some of which are probably from overwatering. I have moved my lights up a lot compared to where they were. I’ve also improved air circulation.
Here are some photos that capture all the leaves together.
Am I thinking along the right lines? Ph of run off was 6.4 last time I checked. Will check ph again next time I water.
Thanks again for any advice. 👍🏻

 

[9fingerleafs]

Maybe the roots are rotting so none of the nutes can be absorbed. When you are feeding but still getting all the symptoms the roots are not taking them inside the plant. I recently had an issue with pythium and got it resolved using another fungi called trichoderma.

 

[CaptainWiese91]

What about a nutrient lockout maybe ? From all the salt buildup in the medium?

 

[Itsasecret]

Thanks. I’ll check for root rot tomorrow by trying to have a look through the drainage holes, maybe cut another small drainage hole to see the hidden roots? Also will give plain ph’d water again next time with a decent amount of run off. (I gave plain ph’d water last time I watered her). Hoping to try and resolve this issue quickly if possible as this is an auto flower. This is my first grow, don’t mind admitting that I’m not sure what’s best to be doing at this stage. Will be good to find out the root of the problem or if the roots are the problem.

 

[9fingerleafs]

When salt build up occurs the ec starts to rise and you get tip burn all over the plant and leaves start to get hard and crispy. Are you able to lift or tilt your pot in order to guess how heavy it is? It’s the best way to make sure the plant actually needs water. Over watering is common. Let the pot dry before the next water. What soil you using? And what nutrients how often. Everything you can tell me will help narrow the possibilities

 

[9fingerleafs]

Btw the best way to detect rot is by smell. Dig up a bit of soil and smell it. When you water recover some runoff and smell it. Smell the bottom of the pot if you can.

 

[Itsasecret]

I’m leaning towards Nute burn/Nute lock out from salt build up. I feel like I’ve watered this plant prematurely a few times and with not enough run off.
I’m growing in Canna Terra Professional (not plus) with a little extra perlite. I started feeding (very lightly) around day 25 with Biobizz grow @ 0.25ml per litre. I have gradually increased the dosage up to 0.5ml per litre. I started to feed bloom a week into flower at 0.5ml per litre. I’ve given them molasses once but only a teaspoon per 5L.

 

[Itsasecret]

I always ph the water down to around 6.3/6.4 after adding nutes. When I’ve checked run off ph in the past it’s been around the same coming out as going in.

 

[9fingerleafs]

I find that very unlikely. You’ve been feeding low doses and the soil you are using only has nitrogen in it. I’ve never used biobizz but I’ve seen many people have issues with them. Regardless of how this plant recovers if the nutrients are the issue then this will happen again. I don’t think it’s rot. I think you need calmag. Iron calcium. You could also use other brand of calmag or any micro nutrients like big bloom if you wanna go organic.

 

[Itsasecret]

Sorry forgot to say that I’ve given Vitalink CalMag 🤦🏼‍♂️
I started that around day 30.
0.5ml per litre every other watering. I increased the dosage slightly to 0.75ml per litre just before the issues started. At first I thought it was too much Nitrogen. I really should have mentioned this! Quite an important thing I missed out. I’ve also given Biobizz Topmax at 0.25ml per litre from day 30. That’s everything that’s been added apart from Ph down. I don’t think I was getting enough run off when I was watering.
The pot still has some weight to it so unfortunately not ready for watering yet. I think it would benefit from being watered with plain water with a decent amount of run off? Soon possibly because it’s starting to look worse.

 

[Itsasecret]

I haven’t got time to get any new nutrients. They will probably take a few weeks to get to me. Everything I’ve had to order recently has understandably taken a while. Not sure what move to make next? The plant is looking worse every day and it’s still not ready for any water. The roots look and smell good. Leaves look very unhappy. Getting dry and crispy on the tips. Some curling up some curling down. All kinds of issues. What would you do? (This is an auto flower) Day 44.

 

[Itsasecret]

I’m using the same nutrients on my other two plants and they are doing well so far. 🤞🏻

 

[Itsasecret]

I’ve added the photo of all 3 plants together. All 3 are the same (GSC auto’s) all fed with the same nutrients. Only one plant has gone to 💩