củ
a rounded, swollen part of the stem of some plants, such as the onion or tulip, that stores food and from which a new plant grows
:
• Plant the tulip bulb in the fall for spring blooms.
Trồng củ hoa tulip vào mùa thu để có hoa vào mùa xuân.
• Onions grow from bulbs.
Hành tây mọc từ củ.