Each year I plant onion sets and Green Onions without any luck. The onion sets never get big nor does the green onions very grow they die. What am I doing Wong? Just how do you grow BIG ONIONS? Just how do you grow GREEN ONIONS? What do you use for fertilizer? What kind of fertilizer grows the biggest onions? It is very up setting every year, you set out onion sets and green onions and end up getting nothing. Can someone help me in growing these?