Any idea what's up with these seedlings?

[MGD420]

What do you have that has potassium? Most supplements with K also have N and it looks like there is enough N.

I'm a big fan of Plantation Unsulfured Blackstrap Molasses (other brands like it) because the potassium is 600mg/tbs, it also has 200mg calcium and other minerals as well. Read the label. There is some iron in there as well so, if it is an iron issue this should help. You can get more detailed information on nutritional websites. Briar Rabbit Unsulfured Blackstrap Molasses has 450/mg per TBS(21g). It is also missing a bit of the other goodies as well.
You should look at the potassium amount. Their are some brands that are better than others. Maybe a drive to the supermarket to see what they have.
Generally 1 TBS/gallon is what is used.
Did you say the other ladies had some dermatitis? spotting?
"calcium deficiency, the main symptom that you’ll be able to notice is brown or bronze splotches or spots on your leaves. It is also often associated with yellowing (though leaves don’t always turn yellow). Occasionally the splotches may appear purple especially under LEDs. Calcium deficiencies are often caused from low pH at the roots, but also occasionally from growing in soft/filtered water."
Heck, give them a little juice too. Just be careful not to over do it. I hear some plants are temperamental.
p.s. I force my plants to see things my way or I threaten them with Lollipopping in the middle of flower. I did it once just to show them who's in.... never doing that again. LOL. Once was enough.

A couple of the plants had some spotting on the lower leaves but they haven't gotten any worse. The only plant that seems to be showing new signs of some sort of deficiency/leaf damage is the one I posted the two pics of.
I over did my last plants with the nutes and they turned out fine, leaves were a little dark and only started yellowing nearer harvest.
Cost me a fortune though as the nutrients I was using weren't the cheapest.
Not sure if they sell a lot of the stuff you mentioned here if you reside in the US or Canada. I'm a UK grower and a lot of the stuff other growers use on here they don't seem to stock in the UK.
I'll take a look at the labels on the bottles of nutrients a bit later, im in the middle of decorating. The joys, I enjoy decorating as much as I enjoy watching paint dry.

If it helps the nutrients I'm using at the moment is Canna - A & B.
I've also got terpinator which I've only started using.
I was using Canna Vega A & B but due to the loft grow being stripped down I'm no longer going to be recirculating nutrients.
From what I've read though the canna vega and flores can be used in the same manner but they were designed to be recirculated.
Canna
2.5ml part A
2.5ml part B
Per litre.
Total 50Ml

Terpinator
10ml per metric gallon
I rounded it off to 50ml total
I calculate my feedings by litre and there's 5.28 metric gallon in 20 litres.

 

[MGD420]

Here's the labels for Canna part A & B

 

[MAK1]

Here's the labels for Canna part A & B

OK, I'ma start this by saying IMHO this is heavy on Nitrogen with lots of other goodies in there.
Just for comparison purposes. Calculate the actual amount (in milligrams) of a specific mineral that you are giving.

Look at the weight of the bottle. 975grams
Potassium is K2O @0.7%, we subtract the molecular weight of the Oxygen and have 0.6% Potassium ion.
975 grams x 0.6% (0.006) = 5.85 grams per bottle (5,650mg K)
1000ml/bottle @ 5ml per serving = 200 servings

5,650mg/200 servings = 28 mg K+/serving
A tablespoon (21 grams) of molasses has 250 mg K+
A tablespoon of Blackstrap molasses has 450 mg K+
A tablespoon of the best black strap molasses has 600 mg K+ and 200 mg Calcium.
What do you limmies have for molasses?
You might find your way to a garden store 'because next your going to want some type of triple phosphate. Any garden center here in the States has it. Usually in with the specialtiy stuff for roses and tomatoes. Something like 0-54-0. A small box about 1-5 pounds. You only need 1/4 tsp per gallon and only for part of the grow. I do a drop in the start. A dose 1-2 week before 12/12 flower and hammer on it in late flower with K+ and phosphorous.
I like to find some companies nutrient profile and then emulate it as best I can.
I am still new and building my supplies all the time. Working my way up to superior soil.

 

[MGD420]

OK, I'ma start this by saying IMHO this is heavy on Nitrogen with lots of other goodies in there.
Just for comparison purposes. Calculate the actual amount (in milligrams) of a specific mineral that you are giving.

Look at the weight of the bottle. 975grams
Potassium is K2O @0.7%, we subtract the molecular weight of the Oxygen and have 0.6% Potassium ion.
975 grams x 0.6% (0.006) = 5.85 grams per bottle (5,650mg K)
1000ml/bottle @ 5ml per serving = 200 servings

5,650mg/200 servings = 28 mg K+/serving
A tablespoon (21 grams) of molasses has 250 mg K+
A tablespoon of Blackstrap molasses has 450 mg K+
A tablespoon of the best black strap molasses has 600 mg K+ and 200 mg Calcium.
What do you limmies have for molasses?
You might find your way to a garden store 'because next your going to want some type of triple phosphate. Any garden center here in the States has it. Usually in with the specialtiy stuff for roses and tomatoes. Something like 0-54-0. A small box about 1-5 pounds. You only need 1/4 tsp per gallon and only for part of the grow. I do a drop in the start. A dose 1-2 week before 12/12 flower and hammer on it in late flower with K+ and phosphorous.
I like to find some companies nutrient profile and then emulate it as best I can.
I am still new and building my supplies all the time. Working my way up to superior soil.

Limey that made me chuckle a bit.

The rest of what you said just went straight over my head.

I could always have a look in the garden stores near me and see if they sell molasses and the other stuff that you mentioned for roses and tomatoes. It won't be anytime over the next 2 or 3 weeks as the wallets a bit empty at the moment.
I'm pretty sure all the stuff you mentioned can be bought in the UK just brand names are hard to find but they normally will have something similar.

 

[FelipeBlu]

Terpinator is potassium sulfate. But before that..
I have seen this kind of leaf curl due to heat or low humidity. What are your environmental conditions like?

 

[MGD420]

Terpinator is potassium sulfate. But before that..
I have seen this kind of leaf curl due to heat or low humidity. What are your environmental conditions like?

What you mention is more in line with what I was thinking.

At the moment the temp is 27C and humidity is at 64%
Temp ranges from anywhere from low 20's haven't seen it go above 29C and humidity lowest I've seen it go was around 43% and highest around 69%

 

[FelipeBlu]

Okay, that doesn’t sound too bad. Let’s see, 29 is about 84 - yep, that looks okay.

So let’s get back to a possible K def. What’s your current levels of Canna A and B again?

 

[MAK1]

What you mention is more in line with what I was thinking.

At the moment the temp is 27C and humidity is at 64%
Temp ranges from anywhere from low 20's haven't seen it go above 29C and humidity lowest I've seen it go was around 43% and highest around 69%

I did not think environmental stress because:
He is in the UK. There weather is very stable compared to almost anywhere in the US this time of year.

The leaves otherwise look rick and healthy, only a little curl.
Early photos show tips brown all the way down.
The serrated edges are now turning brown as deficiency continues
Part A + B is NPK 5-4-3 and 4-0-1. It's heavy with N leaving his plant shortened on other stuff....Early lite spotting looks like a touch of calcium deficiency.
It could be something else.
I normally grow food. This is my first "grow".
It's kind of like animal nutrition. Animals and plants generally have about the same needs, hold the phosphates.
p.s. I have been giving my excess feed drain water to my canna lilies. Wow did they flower!

 

[FelipeBlu]

I did not think environmental stress because:
He is in the UK. There weather is very stable compared to almost anywhere in the US this time of year.

It’s a tent - with lights and uncertainties regarding ventilation, heat can always be a factor - which has now been easily eliminated as an issue.

And yes, there have been previous K and Mg defs.

 

[MGD420]

Okay, that doesn’t sound too bad. Let’s see, 29 is about 84 - yep, that looks okay.

So let’s get back to a possible K def. What’s your current levels of Canna A and B again?

What about the humidity is that fine. I think the plants are in early flower at the moment.

 

[MGD420]

I did not think environmental stress because:
He is in the UK. There weather is very stable compared to almost anywhere in the US this time of year.

The leaves otherwise look rick and healthy, only a little curl.
Early photos show tips brown all the way down.
The serrated edges are now turning brown as deficiency continues
Part A + B is NPK 5-4-3 and 4-0-1. It's heavy with N leaving his plant shortened on other stuff....Early lite spotting looks like a touch of calcium deficiency.
It could be something else.
I normally grow food. This is my first "grow".
It's kind of like animal nutrition. Animals and plants generally have about the same needs, hold the phosphates.
p.s. I have been giving my excess feed drain water to my canna lilies. Wow did they flower!

It depends on what you mean by stable
The weather in the UK is definitely unpredictable especially in the part of the UK where I stay. One minute it could be raining hailstones then rain and 10 minutes after the sun could be out splitting the trees. Its not as extreme as the sort of weather you get in the US regarding heatwaves etc though.
Only reason I was thinking it was more on the lines of possibly environment is that I read a lot online to try learn about the plants, I then ask questions on here before attempting to correct any issues as a second opinion from more experienced growers.

Most of the plants are quite healthy some deficiency early on but it's more or less the one plant that has the curling leaves.

Just checked on them now, they look quite happy.

 

[bluter]

keep watch for it showing elsewhere on the plant. if it keeps going or continues to appear on other leaves it will need to be addressed.

i suspect you grew through a bit of a nute issue, with some heat/humidity on top, and grew through it as you bumped nutes.

i wouldn't get complacent, but you are likely through it. keep us informed. good job.

 

[bluter]

i should have added i suspect it was potassium. potassium begins with leaf edging but does not curl on it's own.
thinking the curl is the leaf reacting to the def and a bit of heat combined. keep watch.

 

[MAK1]

It depends on what you mean by stable
The weather in the UK is definitely unpredictable especially in the part of the UK where I stay. One minute it could be raining hailstones then rain and 10 minutes after the sun could be out splitting the trees. Its not as extreme as the sort of weather you get in the US regarding heatwaves etc though.
Only reason I was thinking it was more on the lines of possibly environment is that I read a lot online to try learn about the plants, I then ask questions on here before attempting to correct any issues as a second opinion from more experienced growers.

Most of the plants are quite healthy some deficiency early on but it's more or less the one plant that has the curling leaves.

Just checked on them now, they look quite happy.

Stable? Nearly everywhere is more stable than where I am. 95 degrees on Thursday and 55 on Saturday. 25-30 degrees change is normal and the humidity fluctuates from 40% to 100%. -40 winter to 95 summer.

 

[MGD420]

keep watch for it showing elsewhere on the plant. if it keeps going or continues to appear on other leaves it will need to be addressed.

i suspect you grew through a bit of a nute issue, with some heat/humidity on top, and grew through it as you bumped nutes.

i wouldn't get complacent, but you are likely through it. keep us informed. good job.

Hi bluter. Thanks for the reply.

I've been checking them on a regular daily basis to see if any leaves and newer growth is going the same. Other than the one plant the rest only have some yellowing spots on the lower leaves.
The last couple of weeks things were a mess with taking longer than anticipated to set the loft up then having to take the whole lot back down due to the electrical inspection. The plants were in pots far too small for their size and I wasn't able to get the pots I enitially wanted to start the seedling in elsewhere other than buying them online but possibly having to wait a week or so for delivery then there was the nute issue with not giving them enough. The beginning of the grow was a disaster.

I will do, I'm sure you'll be tagged in a few posts asking for advice as the grow continues.

 

[MGD420]

i should have added i suspect it was potassium. potassium begins with leaf edging but does not curl on it's own.
thinking the curl is the leaf reacting to the def and a bit of heat combined. keep watch.

Is there anything regarding potassium that could be used to correct the issues if they happen again using what I have at the moment. Not sure what can be used with what but the following is what I have at the moment.


Canna A & B
Canna vega A & B
Canna flores A & B
Canna calmag agent
Advanced nutrients pH perfect
Grow, micro and bloom
Advanced nutrients big bud
Advanced nutrients overdrive
TA Calcium magnesium 1.0.0 Ca 0.4% mg 0.1%
Shogun Zenzym
Terpinator.

Thats everything I have. I can post labels if needed at any point.

 

[FelipeBlu]

Terpinator is the only item you have that is just potassium. You could start with 1ml/L and see how that goes. Don’t overdo it though - excess K can cause Mg def.

 

[MGD420]

Terpinator is the only item you have that is just potassium. You could start with 1ml/L and see how that goes. Don’t overdo it though - excess K can cause Mg def.

Thanks for the reply FelipeBlu.

Last feed they got roughly 10ml of terpinator per metric gallon.
I mix in 20 litre batches, there's something like 5.28 gallons so mixed in 50ml of terpinator for the entire batch.
Would I be better ditching that batch and mixing a new batch at 20ml total

Thanks again.

 

[FelipeBlu]

When did you do this? It will take some time for the plant to take up the K and improve. Remember, existing leaf damage will not repair. I would not increase to 20ml yet (if ever).

Also, I’d like to point out that another environmental factor that can cause leaf curl is if your fan is blowing on them too much. That lowers humidity on the leaf surface and the leaf curls to protect itself.

 

[MGD420]

When did you do this? It will take some time for the plant to take up the K and improve. Remember, existing leaf damage will not repair. I would not increase to 20ml yet (if ever).

Also, I’d like to point out that another environmental factor that can cause leaf curl is if your fan is blowing on them too much. That lowers humidity on the leaf surface and the leaf curls to protect itself.

Last night they received a big feed, I only feed them every couple of days since they're in hempy until I get at least 20% run off.
I have been topping them off with a light feeding every other day just because they have just been transplanted and their roots most likely haven't reached the bottom yet. I planned on doing that for around 1 - 2 weeks as I've noticed the roots reach the bottom fast in perlite.
I was going by the label on the terpinator bottle thats why I added 10ml for every us gallon 3.78 litres. Terpinator recommended dose for veg is 5 - 10ml per gallon.
I added 50ml to 20 litres so 2.5ml per litre.

The fan is blowing towards the plants and the plant that has the curling leaves is on the side closest to the fan also.

Thanks again for the reply