I've grown Wallas for many years here in Zone 4a. I start them 2 weeks after the storage onions on March 15. Storage onions I start March 1. I also plant them 2 weeks later than the storage onions. They don't seem to be quite as hardy.
I just inventoried my trays and stuff and many of my covers are broken. I think i got some new ones last year, but I didn't finish that part of the inventory.
Just one month and I will be starting stuff too...
It is exciting to try different plants and I am hoping for a nice onion crop. I am still trying to figure out where to plant them all. I may have to make another raised bed just for them in a real sunny spot. lol Sometimes I regret taking out my largest garden as I was trying to cut back on the work involved. Now, I am trying to grow in a much smaller area with the increase in food these days. Have a great weekend.
I’m assuming you know onions are day length sensitive. I once tried to grow them on the west side of the gardens and they just didn’t do well due to the shading in late afternoon.