10 day old seedlings - issues! pls help

Hi all. 2nd grow, coco, 15L pots

2x Sour Orange Diesel Kush auto
1x Blue Treacle auto

Lights - DormGrow 240W LED/Mars Hydro 190W UFO LED
Tent - 60x60x140
Nutes - just seedling nutes from Canna start

Problems - environment - Humidity is fluctuating a lot. Added the LEDs the other day, made the grow room RH 35-45%, as well as average temps being 26-29c, so I added a mister in a tub of cool water (just about visible on bottom right of grow room pic).

When the mister is in action it brings temps down slightly, as well as increasing the RH to 70-80%. The problem is, after 20 minutes/half an hour of being off, it's back down to 40-ish%. I haven't got the extractor on as this would worsen the problem, though I have got an intake fan active as without it temps rocket.

Should I give the plants a steady environment by not using the mister, or is it better to keep raising the humidity and letting it fall? I currently have it set to turn on for 15 minutes every hour.

Also, could someone confirm the marks on one of the plants is a bit of nutrient burn? I'm going to ease off next water, especially in this environment. I also think I may have overwatered the other two plants due to the droopy leaves - correct call? Been spraying them a lot too, might ease off that too.

All any any advice would be appreciated.

I apologise for the awful quality photos. Just quickly took them with my phone to get some help.

Cheers

mine are 8 days from seed...i havnt used any nutes besides what comes in the soil already.
not quite sure what you did.

did you over water or something?

No nutes for at least the first 3 weeks. Or until you start to see signs of deficiencies.

LED growing gives off less relative heat than HID growing. Therefore the water in the soil evaporates less quickly in LED.

Fluctuating RH shouldn't cause major problems, just as long as you keep air circulating around your babies.

see4 said:

No nutes for at least the first 3 weeks. Or until you start to see signs of deficiencies.

LED growing gives off less relative heat than HID growing. Therefore the water in the soil evaporates less quickly in LED.

Fluctuating RH shouldn't cause major problems, just as long as you keep air circulating around your babies.

Click to expand...

yeah what he said. u shouldnt of given them any nutes yet.
id turn of the mister or whatever, my rh is around 30-45 and i have no issues

The leaves look a little yellow which makes me think there may be some use for cal-mag? Maybe next watering should just be plain ph'd water with some cal-mag? Being in coco, there are no existing nutrients in the medium for the seedlings to use, which is not the case in soil. Would you still advise not feeding for three weeks? Last grow I fed all the way through and got decent results, and everything I've read and seen seems to suggest the same but at lower doses.

Hopefully some stability will enable them to kick on, it's just trying to find that happy medium in regards to RH, temps and the rest!.

that's a tiny baby u don't need nutes on that yet,give it GOODph water 5.8 relax give it a few days

see4 said:

No nutes for at least the first 3 weeks. Or until you start to see signs of deficiencies.

LED growing gives off less relative heat than HID growing. Therefore the water in the soil evaporates less quickly in LED.

Fluctuating RH shouldn't cause major problems, just as long as you keep air circulating around your babies.

Click to expand...

This is the worst advice I have ever heard. If he waits 3 weeks to feed, he 's going to save a lot on nutes, because the plant will probably be dead. Coco is completely inert and contains no nutrients. I start mine off on 1/8 strength nutes from the start and increase as it grows. About the only time that coco can be overwatered is when a very small seedling is in a very large container, like yours. Maintaining the right water to oxygen ratio for roots that small in a container that large is going to be a challenge for you until it grows a bit. The reason the other guy's plants look so much better than yours at almost the same age is because he started his in 18 oz. solo cups instead of 15L pots. You can water almost everyday in a container that size. I would water around the plant every couple of days - don't saturate - just make sure it is moist around the stem, until it grows a bit more - then increase the watering.

MickFoster said:

This is the worst advice I have ever heard. If he waits 3 weeks to feed, he 's going to save a lot on nutes, because the plant will probably be dead. Coco is completely inert and contains no nutrients. I start mine off on 1/8 strength nutes from the start and increase as it grows. About the only time that coco can be overwatered is when a very small seedling is in a very large container, like yours. Maintaining the right water to oxygen ratio for roots that small in a container that large is going to be a challenge for you until it grows a bit. The reason the other guy's plants look so much better than yours at almost the same age is because he started his in 18 oz. solo cups instead of 15L pots. You can water almost everyday in a container that size. I would water around the plant every couple of days - don't saturate - just make sure it is moist around the stem, until it grows a bit more - then increase the watering.

Click to expand...

Thanks for all the replies. Mick, that's what I thought in regards to coco. Being an autoflower, the last grow I made the mistake of transplanting from a smaller container into the autopot, and that severely stunted her growth, which is why I've started them in these. So you think I should give them a small watering tomorrow? Plain or with nutrients?

Thanks for all your help, keep it coming!

I would water around the plant with weak nutes pH'd to around 5.8 to 6.0 or so. Remember - not to saturation. If transplanted properly the roots should not even be disturbed, and the plant should transition into the new pot without missing a beat.

MickFoster said:

This is the worst advice I have ever heard. If he waits 3 weeks to feed, he 's going to save a lot on nutes, because the plant will probably be dead. Coco is completely inert and contains no nutrients. I start mine off on 1/8 strength nutes from the start and increase as it grows. About the only time that coco can be overwatered is when a very small seedling is in a very large container, like yours. Maintaining the right water to oxygen ratio for roots that small in a container that large is going to be a challenge for you until it grows a bit. The reason the other guy's plants look so much better than yours at almost the same age is because he started his in 18 oz. solo cups instead of 15L pots. You can water almost everyday in a container that size. I would water around the plant every couple of days - don't saturate - just make sure it is moist around the stem, until it grows a bit more - then increase the watering.

Click to expand...

I'm not going to get into a pissing contest with you, but easy on the rhetoric.

I've successfully grown several dozen harvests from seed, and the majority of the time, I feed my seedlings only water for the first 21 days. I've done so successfully with coco, super soil, under current, hempy buckets and a few others, all without feeding them, or doing a very light feeding.

Also please note, "Or until you start to see signs of deficiencies." -- Which, depending on the strain, can be anywhere from 7 days to 21 days roughly.

Autos tend to be a little more sensitive to nutrients, and therefore you tend to go light on them.

Anywho, to each their own. Just try not to be a total dick, mmkay?

milkman raise your lights...

Icannabis said:

milkman raise your lights...

Click to expand...

The LEDs are 19" above the seedlings. DormGrow recommended 16-18" for this model at seedling stage, but I thought that might be a bit close, would you raise them further still?

you need to let them stretch up alittle get the leafs away from the soil...without getting to technical double the distance then wait a few days see if they move...I'll up load a picture tonight because I have some seeds I start couple days back...Good growing

Icannabis said:

you need to let them stretch up alittle get the leafs away from the soil...without getting to technical double the distance then wait a few days see if they move...I'll up load a picture tonight because I have some seeds I start couple days back...Good growing

Click to expand...

Thanks that would be appreciated! I have raised them by about 4" we'll see how they react overnight!

heres mine day 10

keppt light probably 6" this whole time, i just moved it a tad further today as ill be topping soon anyways and they look just a TAD crinkly

see4 said:

No nutes for at least the first 3 weeks. Or until you start to see signs of deficiencies.

LED growing gives off less relative heat than HID growing. Therefore the water in the soil evaporates less quickly in LED.

Fluctuating RH shouldn't cause major problems, just as long as you keep air circulating around your babies.

Click to expand...

I agree with all but the last point -- fluctuating RH will absolutely cause serious problems particularly later in veg and flowering. Issues like PM aren't usually a result of simply having high humidity, but rather big swings in humidity.

lawlrus said:

I agree with all but the last point -- fluctuating RH will absolutely cause serious problems particularly later in veg and flowering. Issues like PM aren't usually a result of simply having high humidity, but rather big swings in humidity.

Click to expand...

my veg room is currently 24 and my flowering room is 35, no issues really

cbuts05 said:

my veg room is currently 24 and my flowering room is 35, no issues really

Click to expand...

What does this have to do with the post you just quoted? Your statement doesn't mean anything here unless you qualify it with another statement to correlate to the point made in my post.

lawlrus said:

I agree with all but the last point -- fluctuating RH will absolutely cause serious problems particularly later in veg and flowering. Issues like PM aren't usually a result of simply having high humidity, but rather big swings in humidity.

Click to expand...

Right, I agree, fluctuating RH does affect outcomes during later stages of VEG and FLOWER, however we are talking about the SEEDLING stage, where fluctuating RH is not as big a deal. I know a few growers who keep their seedlings under humidity domes for 2 weeks after sprouting, and their plants turn out just fine, every time.