onions and shallots

i,m thinking of growing some onions and shallots in a 3foot by 4foot by 2foot deep container.
will it be
a.big enough and deep enough
b.ok to use compost in the container or will i have to get hold of some top soil
thanks in advance

 

yes big enough.. does it have some drainage holes?
compost will be better than soil i think

 

As long as you don't want to grow loads it should be ok, I think the norm for sets is about 4" apart and a foot between rows probably more space for shallots

 

My January sown onions which were started in the green house, then moved to a cold frame three weeks ago, should acording to the packet be ready fo hardening off now, but as the weather is still very cold is there a risk of bolting later if they go out now?

 

I would be inclined to leave them in the cold frame, but open the lid during the day for a couple of weeks, plant them out at he end of april, weather permitting

 

Thanks for that Rossco, will hold on then until end of April, with a bit of luck the weather will have warmed up by then.