The potato onion (also known as an Egyptian onion, underground onion or multiplier onion) is a group of varieties
from ''Plants For A Future'' which Maud Grieve calls ''Allium'' × ''proliferum'' but has also been classed in the Aggregatum Group of ''Allium cepa'', similar to the

shallot The shallot is a botanical variety (a cultivar) of the onion. Until 2010, the (French red) shallot was classified as a separate species, ''Allium ascalonicum''. The taxon was synonymized with '' Allium cepa'' (the common onion) in 2010, as the ...

. It sometimes produces irregular-shaped or round

bulb In botany, a bulb is structurally a short stem with fleshy leaves or leaf basesBell, A.D. 1997. ''Plant form: an illustrated guide to flowering plant morphology''. Oxford University Press, Oxford, U.K. that function as food storage organs dur ...

s, which in some old English varieties may be large, although others may be less so. It is planted from bulbs, not from seed. It should be planted in the fall to early spring. Sources differ about planting depth, some saying shallow planting is appropriate and others calling for deeper planting.

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Onion cultivars Perennial vegetables {{vegetable-stub