Scientific Name: Allium cepa
Eatable portion: Bulb
Preferred Temperatures (°F): 55 – 77
Preferred pH: 5.5 – 6.5
Plant spacing: Seed – ½ inches deep, spread in a row and thin as needed when they get larger. Sets – 3-4 inches apart.
The onion is actually all leaves. The scale portions (the part we peel off before chopping) are foliage leaves and the inside are storage leaves. The foliage leaves are formed 80 – 170 days after planting depending on the cultivar.
Onions are ready to harvest when the tops have died back naturally. Lift the bulbs gently to harvest. If storing, cut the top excess off and let them dry naturally before storing them in a cool dry place.