Early Yellow Globe is a popular yellow bulb onion and grows well in northern states. Grow the yellow Buffalo onion for an early harvest. The Ebenezer onion is either white or yellow. They grow very well from sets. White Portugal is an excellent option to grow by seed. Use this onion quickly after harvest. Yellow and White Spanish are popular onions for northern states. They produce large bulbs but have a later harvest. Sweet Sandwich is a yellow hybrid onion that stores well. Walla Walla Sweet is a popular long-day onion.