| I don't know--it depends on a few things. First, it has to produce viable seeds. Next, it has to be able to reseed in a temperate climate. Tropical is no good, but sub-tropical isn't so iffy and does have fluctuating temps with distinguishable seasonal difference. Freezing is not needed for Winter Sowing---though many people believe so. It's named for the season, not the freezing climate. I've so far WSed Corn, Oats, Rye, Wheat, Quinoa, Millet, Amaranthus. I haven't done rice or barley yet. I do believe that time will prove our most common grain staples can grow globally. There surely are pockets of limiting Bounded Hybrids Zones, but that would be specific occurences in specific regions of specific natural or manmade crosses. So, disregarding these few bounded hybrids, there are going to be naturally thriving and established grains for every region and zone across the continents. To put it simply, if you know of a rice that reseeds in a temperate climate, you've got a good chance of success for WS germination. However, a long-season grain WSed in a short season climate, may not fully develop its seeds before you want them to. Choosing is important. My equivalent would be getting a letter from Northern Greenland that 90 day toms sprouted fine but were still green when winter returned. It would be better to sow SubArtic Plenty, Matina, Moscow or Early Girl, etc, instead of late season toms like Goliath or Hawaiian Pineapple. To quote Mister Spock ~ "It is not logical." Oryza is a Poa, as you knoa, so when you soa, make shoa it don't groa everywhere. T--who would like to add a cautionary word about growing Quinoa. DON'T! It's a Chenopodium and looks and grows like 6' high Lambs Quarters on Steroids. It reseeds like it too. | 
