Onions may look simple but have complex anatomy, hiding surprises within each layer.
To learn more about the morphology and habit of Onion plants, follow the article!
Overview of Onion Plant
Onion (Allium cepa) belongs to the family Amaryllidaceae, alongside Garlic, Leeks, Daffodils, and Shallots.
Hence, the basic structure of the family members is almost the same, with a few differences in their aroma and taste.
To look further at Onions, go through the table below.
|Naming & Growth Zones||Common Name
Common Onion & Bulb Onion
Long Day Varieties: 1-4
Intermediate or Long Day Varieties: 5
Intermediate or Short Day Varieties: 6-7
Short Day Varieties: 8-11
|Ecology||Habit: Annuals, Biennials, or Perennials
Native Range: Central Asia
|Morphology||Stem: Bulb or Tunicate Bulb
What Part of The Plant Is Onion?
Onion bulbs consist of a compressed central underground stem situated at the bottom.
Additionally, many layers of scale leaves or ‘cataphylls’ rise from the same stem giving it a bulb-like structure.
The lower part of the stem has fibrous roots, one of the characteristics of Onion plants.
Hence, harvesting the mature Onion bulbs may take 3-4 months if planted from the seeds.
But it only takes 20-50 days to harvest the Spring Onions.
From Editorial Team
Spring Onions are young versions of Onion plants with a milder flavor and aroma.
Hence, if you want to incorporate a light and sweeter tang in your dishes, harvest Onions early while they develop.