Magnesium definciency starting?

Calling on some experts to verify my guess of magnesium def. The 3 finger on the right. Lower finger is twisting a bit too. Didn't look this way 9 hours ago. I know it's not from the light. She's 17 days old. Just tap water until today. There's ~4lbs of hot soil below the coco in the 5g bags. Her sister is a nice deep green so I'm guessing she breached the soil already.

Oh, wise and all knowing personages of the interwebz, what say you?

it does show potential for magnesium def but;

im not sure that 3 fingered leaves are a symptom of magnesium def...are they?

and id be surprised you have magnesium def so early in the plants life with such a large pot unless its not a balanced soil mix or if it was potting soil (not hot)

im not sure id do anything yet if the others look healthy

maybe post some update pics in a few days so we can see how it progresses

theres nothing to lose and no potential for harm if you spray it/them with 1/4 to 1/2 tsp per gallon of epsom salt 1 or 2 times over a week and see if that makes her look better

it should take the twists and cupping out almost over night if its magnesium def

Thanks for the response.

That leaf started yellowing between the veins. Feeling confident the roots are still just in the coco.
I'm going to be patient and hope she hits the soil real soon. If more leaves show the same signs, I'll follow your advice, mix up a spray.

Thanks again for your time and advice. Here's to hoping any future pics in this thread are happy ones.

ah ok

I get it; I was slow

you where in coco and transplanted into soil
I must have missed that

so your thinking shes hungry if the roots haven't spread out

id say let her be hungry... her roots will spread out looking for food and water
let her get good and dry between waterings and the root swill search

You are switching modes from synthetic to organic. This will be easier if the transition is slow. I'd keep feeding like it's in coco, but slowly back off until you are down to water or nutrient tea only. The plant will "encourage" the rhizosphere with extra sugar so it can break down organic ferts & make them available to the plant.
Think about bone meal. What is it?
Bone is mostly calcium phosphate, which is something plants can't use. Microbes in the soil process it to make the calcium & phosphorus available to the plant. But those microbes have to eat & the plant is what feeds them. According to Harley Smith (Hodor), a plant can use up to 30% of its daily sugar production just to feed microbes. That's significant as hell and explains a lot.
This is why plants grown in organic soil require bigger pots than soilless mediums.
It's also why plants grown in soilless mediums grow much faster. There's *way* less overhead.

Very much appreciate the help here guys!

Update: Plant on the right was the issue. Leaf at bottom of pic.

So, I did nothing Monday night after posting. Read the newer replies in the morning, smacked myself in the forehead and moved a fan directly on that pot. Never occurred to me to make her search for water. (and this is why I'm here. lol) I was too concerned with the possibility of the coco getting so dry it would leach water from the soil below.

No water for 2 days (I did spray JUST that 1 leaf with the epsom salt mix Tues,Weds,Thurs and it made the spots more pronounced but stopped it from continuing).

Yesterday morning I dumped a quart of water in the tub and let it soak into the soil below the coco (one bonus for these fabric pots). She was looking thirsty by Weds night. She woke right up over night.

New growth looks great. No signs of deficiency but not quite as dark as her older sis on the left (confident she grew into the soil over a week ago, she's a bit darker than the pic shows). I do have the runt of the litter doing the same thing now so she's on the same hunt for water to get to the soil.
Looks like I'll be putting a little more soil under the coco next time. I have to admit my estimation was pretty close there. Now we'll see if I used enough soil to feed them most of what they need for the journey.

Thanks again guys!!

Started LST today as well.

the yellowing on the lower leaf is not a magnesium thing and has nothing to do with magnesium

ignore that one leaf .. its old

they look great

the magnesium def is very very minor

if you look at the pic from a few days back you can see the tops leaves are folding up on the edges like a taco
that's the earliest sign of magnesium def or magnesium lock out

spray them (the entire plant) with 1/4 tsp per gallon Epsom and watch the leaves flatten back out and loose the margin curl

1/4 tsp is very very light.... and wont cause any issue

Thanks. She's getting better by the hour. Took that pic about 2 hours ago and her new leaves are going nice and flat stretching for the light!

This basically boils down to the coco and tap water for too long, correct? No nutes available when she needed them? It is something I was concerned about but I assumed they'd reach soil faster.

If I were to grow this way again (will only happen if this soil gets these autos to their destination) would it be advisable to use a super light mix of go box nutes or the like at around 2 weeks? Probably not necessary as I can adjust for less coco but knowledge is knowledge. lol

Love your posts btw. I've been compiling a bunch of the tips you been giving the hydro guys. Good stuff.

Creature1969 said:

Calling on some experts to verify my guess of magnesium def. The 3 finger on the right. Lower finger is twisting a bit too. Didn't look this way 9 hours ago. I know it's not from the light. She's 17 days old. Just tap water until today. There's ~4lbs of hot soil below the coco in the 5g bags. Her sister is a nice deep green so I'm guessing she breached the soil already.

Oh, wise and all knowing personages of the interwebz, what say you?

Click to expand...

Mag.def is an old plant issue most of the time
unless the grower has been using RO water in which the minerals have been removed

also removing any natural magnesium in that mix too

however switching mediums is a big issue and is much underrated

and often takes rime to resolve