Garlic, shallot and onion query

 This year my onions have been excellent, my shallots mediocre and garlic
b***** awful. As they have been grown in the same conditions, side by
side, why should that be please?
--
Residing on low ground in North Staffordshire

 
It's not just you, my onions have been ... well, I /thought/ they were
terrible, but I dug through the weeds of where I thought they had all
failed, and found a load of huge ones!  But the garlic has all rotted.  I
think it may be a heavy year for white rot, perhaps.  Or maybe the strange
weather just confused them.

In order of poor performance, I seem to have: garlic, white onions, brown
onions, red onions

 Vicky wrote ...

Onions hate weeds around them , if you weed only one thing it has to be the
onions.

-- Regards
Bob Hobden
W.of London. UK

 
They were really well weeded for quite a while, then I turned my back for a
week and they got to the point where they'd just taken over.  I think the
hot then rain then hot then rain just gifted the weeds.  :-/

The potatoes are the same.  I swear I weeded it clear less than a month ago,
have been chipping away at them on the weekends since, and now the damned
things are 5' tall!  Fortunately the potatoes are all growing in bags, so
the weeds aren't actually affecting the potato plant growth, they just look
ugly.

 

Garlic is frog food, ergo only does well in frogland.
My onions are so so.