Long day. 100 days. The Sweet Spanish onion was grown in the U.S. at least as far back as 1916. Sweet Spanish Utah is from that early type, producing large, 3½"–5" globe-shaped bulbs with amazingly mild, sweet flavor. A long-day variety, it grows best in states north of the 37th parallel. Utah designated this onion the state vegetable in 2002.
This packet sows four 10-foot rows.