Shallot, onion and garlic are common bulb crops, belonging to the Family Liliaceae. Shallots (Allium ascalonicum L) are grown mainly for their immature leaves, stems and bulbs. Our spring onions are actually immature shallots, commonly called “small onions”. Garlic (Allium sativum L) is also grown for its immature leaves and bulbs. Only onions (Allium cepa L.) are grown for bulb production.
After 5 weeks of planting, our spring onions are ready for harvest. Watch out for root rot, which is a common disease for spring onions. A fantastic versatile crop which we used for our fried rice and noodle garnishings; spring onion and ginger stir-fried chicken.
(Source: Grow your Own Vegetables by Lee Chew Kang)