I had quite a few hot peppers in plastic cups i reused . I notice for a few weeks all had stopped growing or most at least. So i took a cup with a young congo from trinicoolie boy and i looked at the bottom a small root strand was poking out of the hole i poke in it for drainage. There was my problem the root were all-ready grown to big for the small pot. So i checked the others it was the same case. The goat pepper i have is only 2 inches tall literally and has 4 leaves about ready to put out its 5th leaf and has a killer root system ! the roots are out of the cup at the bottom.! I had a Bahamas finger planted in a bad are and it was producing peppers and that root system was 1/4th the size of a ping pond ball and so i moved it to the side of the house and the peppers are ripening now. I put some epsom salt ferts on it but its a little droopy but it'll be ok i hope.. Now i'll be looking for some bigger pots for my peppers. My naga was a mont old and a centimetre high i was expecting the same root to much idea but ther root system was not imprssive just like that of a sprout which it looked like except it was growing for a montha nd a half at this point. I t died but not only did i get another naga to sproout today ; two days affer i got a letter i planted scorpion seeds in i cup and in 2 days all four srouts were up and now i have 3 scorpions . Yay me !!!!
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Now i know why they stopped growing
- Thread starter peppermanbaha
- Start date
I had the same problem as I only brought 3" and 5" pots. In 4-5 weeks my sprouts went from 1" to 5-6" and I had roots about 1" long outside of the bottom of the 3" pot. Someone suggested that I skip the 5" pot and just go to a much bigger pot as I would end up having to replant in a few weeks anyway. I'm waiting for bigger pots to arrive in the mail and a few of my 3" plants have roots 2" long comming out of the bottom. I was just not prepared for the amount of growth I would get under MH grow lights 
Update. The plants that where planted up from 2" pots to 5" pots have grown to twice the size of the plants that didn't get potted up because I ran out of pots. I really need to take a picture of them side by side. It's amazing how much larger the plants are even though they where the exact same size less than 2 weeks ago. It's almost like the plants that didn't get potted up have stopped growing completly.
It always amazes me how they grow when they have room. Good luck on their continued growth.