Japanese onions

Is it too late to plant Japanese onions ?

 

Sets or seed, too late for seed but sets should be OK I would think.

 

Thank you both ... yes I meant sets. I haven't bought any yet, and wondered if it was worth bothering - I usually get them in September.
I'll buy some later in the week

 

I was even later with them last year and just grew them on in the greenhouse to speed things up a bit. I planted them in the ground in November and they did fine.