October. The guava is a winter fruit, ripening in October in Guangdong and Fujian, and in mid to late August, July to September in summer, and December to January in winter in Taiwan and Hainan, respectively. The guava is a tree plant in the myrtle family, with white or yellow flesh and many seeds, and is mainly found in North America, New Zealand, and China's Hainan, Guangdong, and Fujian regions.