Seedlings are leggy and in a tray under the dome. ...

They are stretching because they are 36 inches away from the light source, that's too far away. Get them closer, that's what the seedlings are trying to do, get closer to the light.

Hello @DKBJJ ! The number one reason for seedling elongation is the lusk of light whether its a week light or it si too far from the seedling. The second reason is a bad spectrum. More blue spectrum will keep the seedlings shorter. Although i grow with HPS from the beginning ( which has red spectrum ) and never had problems. Heat and humidity has literally nothing to do with elongation. If that was the case my plants should be 1 meter tall at the seedling stage since i live at a very hot country and i am currently growing at 34 °C. Also you don't need to put them outside the propagator. Propagators are made for seedlings too and young seedlings love warm and humid environment. The perfect conditions for seedlings are 26-28 °C and 70%-80% RH. Also a little breeze will not stop the elongation but it can make the stem fatter and harder. When the air bends slightly the stem little fibers are braking and then the plant regenerates more. Just like how muscles fibers brake when you work out and then your body regenerates more by using proteins. And finally DO NOT bury them deep when you transplant them . I know that a lot of people tell such things in the forums but it is very very wrong.Cannabis is not like solanum species like tomatoes and potatoes that you can bury the stem deep and they make roots.It can make some little roots but it doesn't worth the risk because you are raising very much the possibility of pythium development and once you have pythium there is no way to save the plant.Anyway the elongation that you have is at acceptable limits but if you see that it keeps goingjust place your lights a little bit closer to the plants (not to the point you will burn them, always checking the temperature...) and give them that little breeze if its possible inside the propagator. If not, support them with a little stick. Happy growing! 👊

Get them out of the dome, only use that till the seedling pops through the soil! Get a small fan or gentle breeze blowing over the plants, support the stem if they are too flimsy! When you come to transplant her bury the plant/stem deeper to help support her 😊 i hope this help, give me a message if you need more info ✌️💚

Hi @DKBJJ! Well, my guess is that those babies suffered from heat and too much humidity in the air. Do you measure the temperature inside or outside the dome? For your information, domes are made for clones, not for germinating seeds. Seedlings don't need high relative humidity, they might even stop growing in a constantly wet environment. Now about your light, yes you can use the 900W LED, just make sure the plant<--->light distance is safe and double-check that your apical summits are not getting too much heat (hand test). Finally, if you don't want them to stretch anymore, you may consider using a tiny fan. A slight continuous breeze helps in building strong (and non-stretchy) stems. Hope this will help, keep us up-to-date and happy growing 👊

hey man your ladies are doing well, probably shot up because of the quality of the genetics, i would say even dim your lights a bit for a couple of weeks because when they're so young they can get stressed even just for too much lights. Try to maintain that distance, maybe they'll pipe down. Also check all your lights are working and you're getting a full veg spectrum. You can probably also turn on your bloom lights to get a bit of extra spectrum on there. I see you're using sugar daddy, this has loads of carbs in it, maybe just having enough nutes to grow is making these seedlings really go? If this doesn't really change anything, then why not buy a cheap flood light - it should double your lux easily. Good luck dialing all this in man, you got it ! 🚀

Yes, I’d recommend you either get them under stronger light or get them closer to your existing lights. If you can’t bring the lights any lower you may be able to raise the tray instead. You can also bury the plants lower in the soil when you transplant into larger pots. Good luck 👍