brownthumb78 wrote: I like the PVC idea. It seems like that would work well with the sandy soil here. Also how do I know when my onions are ready to be harvested? I don't know which kind. The top tube looking leaves grew to 8-9" so I cut those back to just above the soil (I read that if u trim those then the bulb gets more energy to grow) then I dug down to check the bulbs but they're only the size of a small marble. I planted these at the same time as all the other plants & they already produced stuff but the onions aren't making it. Any suggestions? I put the peat moss, manure, mulch & fertilizer on them but its not helping. Where did I go awry?