Can northeast green onions be planted before and after Qingming?

Onions are generally planted in the northeast in the autumn of the first year, around the Millennium solar term, and can be transplanted around May of the second year, and grow into green onions in the autumn. Onions that can be planted before and after Tomb-Sweeping Day can only be transplanted in July, and will not grow too big in autumn. If you want to plant onions around Tomb-Sweeping Day and grow up in autumn, you have to plant Zhangqiu's "Zhangqiu Onions" in Zhangqiu, Shandong. This kind of onion grows fast, has high water content and is not spicy. It can be planted before and after Tomb-Sweeping Day.