1 out of 4 plants drooping, curling and has stunted growth

Hey everyone,

I'm kinda new to growing but I've done a fair bit of research and invested around £700 in a decent setup.

The problem I'm having is that 3 of the 4 plants I'm growing look lovely and have a great amount of growth per day but one of the little buggers is being a absolute pain.

I'm roughly 28 days in the grow and I am using biobizz light mix in 11l smart pots with 35% extra perlite added which provides excellent drainage, Ive purchused biobizz root juice/grow/bloom nutes and a big jar of unsulphered molasses and have a pH pen with concentrated up and down solutions.

I started them on a 1/8 of the recommended amount of root juice from the start which was applied in each water (when i put my finger in to the first knuckle and the soil appeared dry) until week 2 when I upped it to 1/4 and started to add 1/8 grow nutes.

It is now week 4 almost and the other 3 are loving the nutes so I've gradually increased the amount to the recommended usage and expect to increase further if they are happy with the current amount but the 4th plant really looks like its struggling and I've tried several things to combat the problems such as highering and lowering the light, flushing, increasing veg nutes and increasing the air circulation with more fans but nothing seems to be helping the poor thing.

Does anyone have any advice on what I could do to help her recover?

Here are some pics:

Bump

Decrease the nutes on that one would be what I'd do. Flushing isn't really good. Better to Feed with less nutes more often than giving more and needing to flush. I try only to give a plant what it needs to get to the next watering. This way I'm feeding every time with less and NEVER flushing. The PPMs might be low but there only at ZERO for the last watering for me. I've never used those nutes so I can't speak about them. But with some strains not each pheno thrives with the same amount of food. It's really hard to tell with that lighting. The other thing I can say is that leaf damage or abnormalities usually won't regain that "normal" look. Base your judgement as to whether it's correcting or not on NEW growth. Not on what those existing leaves become.

Ok I'll try that and the lighting is a 250w/400w/600w omega digital dimmable ballast with a 600w dual spectrum omega bulb which both support super lumen which increases it to 660w I think and thanks for the help its much appreciated

Did you start with clones or seeds? If you started with seeds there can be strong and weak plants and they will vary in size.

Buba Blend said:

Did you start with clones or seeds? If you started with seeds there can be strong and weak plants and they will vary in size.

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Got some midnight express seeds from freedom seeds n got some magnum seeds free so i had 8 in total but 4 didn't survive which is my fault i guess because I think I put em in a bit too deep tbh

my opinion too much potassium. when plants get too much potassium, the leaves start to molt like that, also the edge of the leaves should show signs of burns or yellow.

my soda water spray has some potassium in it, kept on spraying the plants with it, 3 times a day and it cause it to look like that plant. So I slowed down the co2 spray.

GOLDBERG71 said:

But with some strains not each pheno thrives with the same amount of food.

Ry16 said:

Got some midnight express seeds from freedom seeds n got some magnum seeds free so i had 8 in total but 4 didn't survive which is my fault i guess because I think I put em in a bit too deep tbh

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Like Goldberg says not all need the same feeding. I've had seeds that were all from the same plant that would take on different deficiencies. Of 8 plants one had a very minor a N def. Next to show two big ones wanted more mag. Then Three wanted more calcium at the 3 week into flowering. I should note I grow in soil. What I find best when a strain is new to me is to keep them happy, under fertilize, and let them tell you what they need more of. Not sure if that style works in hydro but it works for me.

BecauseIgotHigh said:

my opinion too much potassium. when plants get too much potassium, the leaves start to molt like that, also the edge of the leaves should show signs of burns or yellow.

my soda water spray has some potassium in it, kept on spraying the plants with it, 3 times a day and it cause it to look like that plant. So I slowed down the co2 spray.

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I'm not using any sprayes at all I just leave a bucket of water in the tent and the humidity stays at 55%-60% any idea on how I would reduce potassium intake?

Buba Blend said:

Like Goldberg says not all need the same feeding. I've had seeds that were all from the same plant that would take on different deficiencies. Of 8 plants one had a very minor a N def. Next to show two big ones wanted more mag. Then Three wanted more calcium at the 3 week into flowering. I should note I grow in soil. What I find best when a strain is new to me is to keep them happy, under fertilize, and let them tell you what they need more of. Not sure if that style works in hydro but it works for me.

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Ok nice I'll see how it goes but the other 3 seem to be ok so they should yield enough to last until the 2nd grow hopefully and they are autoflowering too

When I start seedlings I use a 1kw HPS 12/12. The light is fixed at 44" from glass to growing medium, throughout the grow. This allows me time to get a non-flowered snip from each seedling for cloning. If any plant gets too close the the light and is blocking others, it gets LST'ed into an appropriate position.

Ry16 said:

I'm not using any sprayes at all I just leave a bucket of water in the tent and the humidity stays at 55%-60% any idea on how I would reduce potassium intake?

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nah im saying my soda water had potassium in it, which i thought would I get potassium toxicity if I kept spraying on it, and it did. Actually don't worry about what I said.

This is potassium def, the picture below. Looking at it and your plant, im not even sure you have potassium def or tox.

Just flush the plant, as one of the poster stated. Mix up a weaker solution next time for that plant. Also make sure you pH is right and not off. 3-5 days she'll be sweet. Psst buy a bottle of soda water. Spray it once a day in the morning, and tell me how your plant turns out. In about 1hr, you'll see the change. They'll all look alike plant number 4. All leaves looking up.

You got any fan blowing at the light? The heat from the light could be affecting the plant. I don't see any nutrient issues on that plant.

BecauseIgotHigh said:

nah im saying my soda water had potassium in it, which i thought would I get potassium toxicity if I kept spraying on it, and it did. Actually don't worry about what I said.

This is potassium def, the picture below. Looking at it and your plant, im not even sure you have potassium def or tox.

Just flush the plant, as one of the poster stated. Mix up a weaker solution next time for that plant. Also make sure you pH is right and not off. 3-5 days she'll be sweet. Psst buy a bottle of soda water. Spray it once a day in the morning, and tell me how your plant turns out. In about 1hr, you'll see the change. They'll all look alike plant number 4. All leaves looking up.

You got any fan blowing at the light? The heat from the light could be affecting the plant. I don't see any nutrient issues on that plant.

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I have a fan blowing I between the light and top of the plants an have a thermo/hydrometer with a probe which is now suspended between the light and the top of the plant which gives a reading of 24.4 celcius so the heat shouldn't be a issue to be fair but to be honest I think it did have a little heat stress in the first few weeks which doesn't help.

When you say soda water do you mean carbonated water?

I've just checked it now and after I added the 3ml/litre veg nutes it seems to have new light green healthy growth and has grown about an inch so hopefully it will recover now.

I'm gonna use less nutes as advised and will definitely try the spray.

Thanks for the advice buddy!

yeah carbonated

BecauseIgotHigh said:

yeah carbonated

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Ok nice I just got a 2 litre bottle and will give it a try tomorrow n will update asap.

Thanks again

BecauseIgotHigh said:

nah im saying my soda water had potassium in it, which i thought would I get potassium toxicity if I kept spraying on it, and it did. Actually don't worry about what I said.

This is potassium def, the picture below. Looking at it and your plant, im not even sure you have potassium def or tox.

Just flush the plant, as one of the poster stated. Mix up a weaker solution next time for that plant. Also make sure you pH is right and not off. 3-5 days she'll be sweet. Psst buy a bottle of soda water. Spray it once a day in the morning, and tell me how your plant turns out. In about 1hr, you'll see the change. They'll all look alike plant number 4. All leaves looking up.

You got any fan blowing at the light? The heat from the light could be affecting the plant. I don't see any nutrient issues on that plant.

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Have you compared soda water spray to a yeast, sugar co2 generator? I would love to dump the yeast rig for something else if it is as good.

A.K.A. Overgrowem said:

Have you compared soda water spray to a yeast, sugar co2 generator? I would love to dump the yeast rig for something else if it is as good.

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can't really give a good comparison. could only say that the spray bottle was less work and a cheaper method. I'm still using the same 1L soda bottle id bought. don't have the room for co2 burners and haven't tried co2 tanks yet. more for veg growth. havent tried on flower yet.