Introduction

• Bulb crops : belong to class monocotyledoneae and family Alliaceae. Onion and garlic are major bulb crops cultivated commercially in Nepal as winter crops.
• Family : Alliaceae
• Botanical Name : Allimu cepa L.
• English/Common Name : Onion
• Choromosome Number : 2n =16
• Place of origin : North West India, Afghanistan and Soviet Republic of Tajik and Uzbek and Western Ten Shan, Mediterranean Region is the secondary centre of origin

Botany

• Onion is a herbaceous annual for the edible bulb production and biennial for seed production.
• It has bisexual flowers and is highly cross pollinated
• The flowers are white or bluish in color.