Help! Yellowing in center of leaves...

Just noticed this when checking the girls...

Only happening on one plant...so far, and appears to only be on the first set of true leaves.

This one is 6 days old (Blue Mystic):

View attachment 2616137


Using CFL's about 2" from plants on 24/- schedule...only have them under 150 actual watts right now.

Medium is a mix of peat, perlite and vermiculite and no nutes.

Watered when the soil dries out at 1" deep.

Temps are steady at 80* / humidity at 46%

Any ideas/comments/opinions are Greatly appreciated! Thanks!

what ph is your water your giving them. also i would just go by the weight of the pot for watering when it feels really light is when its time to water.

Water pH is 6.8.

I have read on here that using the pot weight is a good way to measure for watering and have been doing that. They are in small pots (5") right now so I tend to have to water them every day and a half when they feel really light.

let your pots dry almost completely for watering....NOT JUST AN INCH, IMO. I might have a plant in a solo cup take 3 days to dry before watering again!

your in a soiless mixture so you may want to water them with a little lower ph. maybe around 6.2 or so? could anyone else that uses similar mediums chime in?

I was getting ready to re-pot the plants and figured that since I have a lot of peat moss I would just grab a bag of perlite to mix in.

I got the only kind of perlite that HD had...which is MG.

Is this going to cause me a problem:

NPK is 0.04-0.01-0.06



Seems like low amounts but from what I have heard on RIU about MG I think I might return it and take a trip to the hydro shop...any suggestions?

Its fine man, thats trace amounts....Also, you should wash the perlite good anyways which will further eliminate that....Cut the bag open and fill with water, that dust is brutal

Mattemil said:

Its fine man, thats trace amounts....Also, you should wash the perlite good anyways which will further eliminate that....Cut the bag open and fill with water, that dust is brutal

Click to expand...

I had to go past the hydro store so I stopped in and picked up a bag of regular perlite but found out the hard way with the dust! Should have checked the thread first!

Thanks for the reply! I will keep the MG perlite on standby...

As I was checking everything out this afternoon, I realized that the plant with the yellowing is having more problems...and so is a second one.

The one that originally was having problems now has a couple spots on the tips of the next set of leaves (you can kinda see it in the pic) but here is what I'm dealing with now:




Also the smallest seedling is now starting to have problems...The cotyledon are losing their green color and turning a grayish yellow (which I know that they eventually yellow and fall off...but its too early for that yet)



Still no nutes...adjusted the pH down to about 6.2...using moisture meter so I don't over water

Should I try giving these two a drink of diluted nutes? (Earth Juice Grow 2-1-1)



My brain hurts - anyone have any ideas? I would love to hear them please!

Ideas anyone? Please?!?

No nutes! Way to early. The larger one looks burned but I'm not sure by what. The second one looks normal they loose the cotyledons.

If you have a hydro store near by go purchase some Sunshine Mix Advanced #4 or some other known good soilless mix (assuming you are running hydro). If not pick up some soil but I would transplant them both to a known good substrate.

I would say to flush with ph at 6.2 and give it a couple days and if you don't see a change add a little bit of nutes some plants are just real sensitive so just keep and eye on them but they should be fine.

Me personally, I'd try a couple of things, use an organic potting soil, and just later half an inch over what you've got- if you are only using peat and perlite. Second, I'd lay off the low pH. Peat is naturally acidic and it may be actually inhibiting root growth.

When you water with a fresh layer of good potting soil on the top, the water will dissolve some of the organics and soil, and bring it back down to the developing root ball. It may also help neutralize the soil a little so your seedling has a chance to recover. I'm not really an advocate of low pH soil and watering, because how do you know 100% if these strains were naturally adapted to low pH soils in nature? Low pH is fine if you know for sure that strain adapted naturally to acidic soil. Otherwise, the safer bet is to keep it all neutral till you can experiment. But now- you have seedlings that arent responding well to your watering. I would also try lifting the lights a couple more inches up. Could also be a little photonics radiation burn, especially if your tips are drying up on you.