Hardy perennial, edible bulb.
Description: Head of small lavender flowers appears in summer followed by clusters of new onion bulbs at the top of the green stems.
Habit: Medium green leaves, reaches 12 to 24 inches high.
Culture: Prefers full sun and moderately fertile, well drained garden loam.
Hardiness: USDA Zones 3 through 9.
Top Onions were grown by Thomas Jefferson in the Monticello kitchen garden, and these bulbs were harvested from there. The deep red bulbs are strong-flavored, and good for stews and other cooking, while the leaves are used like scallions. New clusters of bulbs are formed in the flower heads, and can then be planted in early autumn to increase stock, or allowed to fall to the ground and root on their own.