110 days. Allium cepa. Plant produces giant 4kg sweet white onion. The Kelsae Sweet Giant Onion holds the Guinness World Record for the Largest Onion in the World at at nearly 15 lb 5.5 oz and 33 inches diameter! It has a unique mild sweet flavor. Impress your neighbors and try growing a World Record size onion. Long day variety suitable for Northern regions.