Hi, I've seen today (second week) that 3 of t...

Looking at the pics i would say it's because they've been kept to wet and starved you're roots of oxygen, causing the problems. If you're in soil you're P.H wants to be a little higher ( 6.0 - 7.0 ) and let pot dry every time before watering until you get 10 - 20 % extra run off, you can measure this to keep P.H and E.C at acceptable levels at root ball !! Try here for more info, Hope this helps !! http://www.growweedeasy.com/how-often-water-marijuana

Based on the pictures it’s hard to say. Are they always that wet or was this a watering day. In general the mesh will hold the roots in for a few days and that might have been why you didn’t see all of them breaking through.

Hey brother! In my opinion, and beeing right true with you, fuck jiffys bro. They just bring trouble to the little seedlings. And you can see that by now ;) You have some burned seedlings, probably cause the acid ph that they bring, and thats not so good in this stage. And I see some other things you shouldn't do. 300w for seedlings bro... is too much light. They don't need all that amount, and you're just spending money in electricity that you dont need to spend by now. Some t5s will do the job till the plants have some 4 pairs of leaves. Another thing... NO nutrients by now. You can kill them with an hell of a burn and your soil will have the nutrients they need now. You can cause a lot of stress on your little seedlings and they cannot handle so much trouble... Take care mate. Any question just ask ok? People are here to help and share knowledge :) Keep it up mate, take it easy ;)

I stopped using jiffy's because they always gave me trouble. They stopped growing because they are rootbound. At 10 to 15 days I usually transplant from 16 oz (470 cc) cups to 2 liter pots, and the cups are completely filled with roots. I also have seen seedling stop developing roots in jiffys, I've even read about some seedbanks recommending not to use them because, since they are made out of pure peat , their pH is too acid (this happened to me and that was the last time I used the things). Many times, seedlings will not brake the fine mesh in the jiffys. What I recommend you to do is to prepare your pots to transplant the seedlings, then carefully cut and remove the mesh and put them inside your previously prepared pots. Once they have more space they will explode with growth.