What to do now with my onion and shallot seedling?

I've got a tray of onion seedlings and one of the shallots. They are about 2" (5cm) high. What to do next? I see that some folks get these veggies going in the autumn. Am I a bit behind the curve here?

I'm a "no-dig" gardener and try to keep the application of fertilizers (other than my wormery liquor and annual composting) at bay.

Any hints and suggestions (like start in the autumn!) would be welcome.

 

I would plant them out as soon as the weather permits, they might be ready for harvest a bit later, but should be ok.

 

I've always sowed onion seeds around the end of January, plant out in mid April, they usually mature late August or in wet years early September.
I don't go for large onions, just normal sized ones.

2 ins is probably a bit too small to plant out yet.

 

Just wondering are these seed grown or sets?

 

Thanks for all the replies. They were seed grown in Melcourt Multipurpose compost. They sort of look like they need a boost now!

 

A weak feed might help but I think it has more to do with amount of daylight.
They pick up quickly from now on.

Without lights I don't think sowing earlier would make much difference.