Just read that it's now time in my area (southern CA) to begin drying the onion plants. This is the first time I've grown onions, and I have a conundrum. Instructions said to quit watering, and when the tops turn brown, bend them down to complete drying till autumn. However, my onions are in a raised bed with tomatoes and other veggies, all of which receive automatic watering. Can't stop watering the onions without killing the other stuff. Tried putting plastic bags over the onions overnight (when the water cycle comes on), but that's impractical for the duration. Ideas??