last fall i bought some red onion sets and put them in the ground. it was probably around the end of october (the halloween decorations were out). they sprouted and the book i have says they are ready "when the tops fall over." what does that mean, exactly? it's been six months, they are going to seed and when i dug a few out as testers, they are more leek sized/shaped than bulbous. is this normal/am i doing something wrong? fyi. im in zone 8.