Leeks

Not a leek expert but those look fine to me, if they are outside and hardened off you could plant them in a raised bed, if your weather is similar to what I am getting its quite possibly the cold that is holding them back, so plant and cover with some fleece, I have onions growing some covered others open and the covered ones are looking bigger which I think is due to the protection from the cold

Cheers Spec

They've been outside for as long as I can remember!