Onion growing tips?

Onion growing tips?

I am about to embark on my 2nd try at growing onions. This year, I've bought burgermaster. Last year, I tried growing them in my regular garden (Walla Wallas) and it took an extremely long time to grow and then they started to rot when they were very tiny. I was thinking about maybe trying to grow some in deep planters this time. I'd read somewhere that adding a little bit of sand into the soil is good for onions. Any opinions on this? Any other tips?
My Room

My Room

So I’m kinda

So I’m kinda

Tulips

Tulips

Ok, some random photos of my back yard… and a question for all you tree people.

Ok, some random photos of my back yard… and a question for all you tree people.

Help!

Help!

Our Little Apartment

Our Little Apartment