1 Pain that does not diminish with rest, and pain that may be worse at night than during the day. 2  Back pain along with constitutional symptoms, such as loss of appetite, unplanned weight loss, nausea, vomiting, or fever, chills or shakes.
Unstable chemicals. Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.
If you planted late, you could still get huge onions if you have lots and lots and lots of rainfall which causes the onions to grow more quickly. You also can compensate for late planting by feeding your onions a big dose of nitrogen early on, something like ammonium nitrate (33-0-0)or ammonium sulfate (21-0-0).