Good article JOY, Iwould just add that the major problem with long day onions in the south is heat. They need the summer soltice to trigger bulbing and in most years and areas July and August are just too hot for onions. Last year we had a cool wet summer and the trial Spanish ( Golden Grande) onions did well. Of course growing onions in the winter for harvest in early spring has the added advantage of leaving space for hot weather crops like okra and southern peas.
Thanks for your input, Farmerdill. I've thought about that. All things being equal. The weather here has been so different each of the last few years things have been rather unpredictable.