seedling elongation even under adequate lighting?

[Paper Hat Guy]

I popped 5 seeds the other day. All germed without issue. paper towel and plate.

I put germed seeds in perlite/coir with the light maybe 1.5 feet away. The heat was set on 80 but I came in the next morning and it was around 90. my mistake. I know the seedlings elongated bc of excess heat, but it there anything I can do to help them survive? One died. the others are round 2.5 inches and are bearing their first set of true leaves.

I've dropped the temp to 77 F and I've got around 26% humidity. I'm adding a small humidifier to hopefully get humidity up to 40%.

Is it even worth keeping these seedlings? I've got a couple more I could try if I had to..

 

[KryptoBud]

Burying the stem in the coco will solve the stretch problem. 90 degrees shouldn't kill them unless the medium dried completely.

 

[evergreengardener]

what is your lighting?

 

[Richard Drysift]

Dried out seedlings die quickly in the heat; especially in a coco/perlite medium. Survivability can be increased by helping the medium to retain moisture:
One cool trick for youngins is to cover them with a ziplock baggie or a humidity dome until they get big enough to stand on their own. You really shouldn't need an external humidifier unless you live in the desert. Cover up the stems with more coir/perlite to help them stand erect. Have a fan blowing on them gently once the ziplock bag is removed which will help thicken the main stems. Adding some vermiculite to your seedling mix can also help retain moisture; kinda too late now but maybe for next time.
Use a hand pump sprayer to water your plants as needed at this point; it's almost impossible to overwater them this way. Keep the medium as moist as a wrung out sponge at all times but never soaking wet.

 

[MichiganMedGrower]

Yeah you can bury them up to a 1/4” to the cots.

Everything below the soil will grow roots.

 

[Paper Hat Guy]

what is your lighting?

96 watt (no idea about par) t5 approx 1 ft from seedligns now. was maybe 2 ft away initially

 

[Paper Hat Guy]

I had no idea you could bury the seedlings! that's awesome. I'd read for hours and hadnt gotten anything about this. im such a noob. good looking out! i love this forum.

 

[legalcanada]

yeah bro it's no big deal, just bury the stem when you transplant... if it's already kinda woody you can scrape it so roots grow out faster

 

[Paper Hat Guy]

hell yeah! i knew you could do that with tomatoes among other things but i didnt even think about it with weed. you ever used worm castings on seedlings?

 

[MichiganMedGrower]

Here’s a pic of what I do. Lower right hand corner are 2 seedlings growing in plastic solo cups.

The one on the right has only been watered to saturation before planting the taprooted seed. The soil packs down a little at first.

When it comes time for the first watering 3-5 days after sprouting I fill the cup around the stretching seedling to the top of the cup and water gently to runoff.

They stay nice and compact with the stem buried and the 6500k t-5 lighting.

Plants are about 10 days apart in growth perpetually. The back 2 were planted together to fill a space in flower. The timing never works perfectly with seed plants. When a plant in the flower room is harvested. One of these that’s ready moves up.

 

[MichiganMedGrower]

96 watt (no idea about par) t5 approx 1 ft from seedligns now. was maybe 2 ft away initially

I keep t-5’s about 10” over seedlings and 6-8” over vegging plants.

They stretch a lot at a foot or more for me.

 

[Paper Hat Guy]

Here’s a pic of what I do. Lower right hand corner are 2 seedlings growing in plastic solo cups.

The one on the right has only been watered to saturation before planting the taprooted seed. The soil packs down a little at first.

When it comes time for the first watering 3-5 days after sprouting I fill the cup around the stretching seedling to the top of the cup and water gently to runoff.

They stay nice and compact with the stem buried and the 6500k t-5 lighting.

Plants are about 10 days apart in growth perpetually. The back 2 were planted together to fill a space in flower. The timing never works perfectly with seed plants. When a plant in the flower room is harvested. One of these that’s ready moves up.

View attachment 4054684

wish i could see picture man i dont think the link is attached but thanks for info!

 

[MichiganMedGrower]

wish i could see picture man i dont think the link is attached but thanks for info!

I just logged back in and it shows up for me.

Here it is again. I will leave it thumnailed for the viewer.

 

[Paper Hat Guy]

I just logged back in and it shows up for me.

Here it is again. I will leave it thumnailed for the viewer.

View attachment 4054724

gorgeous tent! What humidity do you maintain? thanks

 

[MichiganMedGrower]

gorgeous tent! What humidity do you maintain? thanks

Thanks man!

I use a whole house humidifier and dehumidifier to keep the plants and the people at 50-60% rh.

I have all the flowering plants in the spare bedroom next door in 12/12 at all different stages too so I use a stable temp and humidity for everything.

As a guideline. 76 degrees farenheight on average lights on. 66 lights off. I run ventilated so the seasons outside affect this a bit.

 

[Paper Hat Guy]

Thanks man!

I use a whole house humidifier and dehumidifier to keep the plants and the people at 50-60% rh.

I have all the flowering plants in the spare bedroom next door in 12/12 at all different stages too so I use a stable temp and humidity for everything.

As a guideline. 76 degrees farenheight on average lights on. 66 lights off. I run ventilated so the seasons outside affect this a bit.

Good details! I'm probably letting mine get a bit too hot. I've been avg 82-84F during the day and similar during night.

I'll follow you to keep up with what you've got going on. I'm fairly new to forums (and only been growing for maybe 6 months), but loving the community. thanks!

 

[MichiganMedGrower]

Good details! I'm probably letting mine get a bit too hot. I've been avg 82-84F during the day and similar during night.

I'll follow you to keep up with what you've got going on. I'm fairly new to forums (and only been growing for maybe 6 months), but loving the community. thanks!

Read ed Rosenthals book is my best advice.

Here is a ton free pot books originally linked by regulars here.

http://catnews.org/FREE Pot Books/

 

[Paper Hat Guy]

Dried out seedlings die quickly in the heat; especially in a coco/perlite medium. Survivability can be increased by helping the medium to retain moisture:
One cool trick for youngins is to cover them with a ziplock baggie or a humidity dome until they get big enough to stand on their own. You really shouldn't need an external humidifier unless you live in the desert. Cover up the stems with more coir/perlite to help them stand erect. Have a fan blowing on them gently once the ziplock bag is removed which will help thicken the main stems. Adding some vermiculite to your seedling mix can also help retain moisture; kinda too late now but maybe for next time.
Use a hand pump sprayer to water your plants as needed at this point; it's almost impossible to overwater them this way. Keep the medium as moist as a wrung out sponge at all times but never soaking wet.

duly noted and much appreciated!!

 

[Paper Hat Guy]

Read ed Rosenthals book is my best advice.

Here is a ton free pot books originally linked by regulars here.

http://catnews.org/FREE Pot Books/

I'm on it!!

 

[xtsho]

I had no idea you could bury the seedlings! that's awesome. I'd read for hours and hadnt gotten anything about this. im such a noob. good looking out! i love this forum.

http://rollitup.org/t/replant-those-long-stretchy-stems-its-easy.429767/

Two feet away is too far with a T5.