Do you need to cover the green onions in March?

Don't cover the spring onions in March. If you plant onions, you don't need an arch film to let them grow naturally. Anyway, the shallots you planted won't last long, but they will rot because of their limited growth period. The time for raising green onion seedlings can be during the Millennium and the vernal equinox. Before and after the vernal equinox, mix the soil evenly, then sow, cover the soil, buckle the plastic sheet and fix it.