There are varying bits of advice on when onions should be planted, and
I just plant when the opportunity arrises!
"Plant on the shortest day, harvest on the longest day".
I always thought that applied to shallots. I heard it years ago from
Arthur Billett. Is that right? Can onions be planted at the same
time as shallots?
It can't apply to garlic, which is best planted in October.

Pam in Bristol