What do many spring flowering bulb crops require in order to flower?

Many spring flowering bulb crops require vernalization to flower because this process stimulates flowering by exposing the bulbs to a period of cold temperatures. Vernalization typically occurs in the winter months, during which time the bulbs undergo physiological changes that prepare them to bloom in the spring. This is essential for many species that have evolved to require this cold treatment to trigger the flowering process, ensuring that they bloom at the appropriate time when conditions are suitable for their growth and reproduction.

In contrast, chilling refers to a broader range of cold treatments and is not specifically linked to the flowering requirement of bulb crops. Germination pertains to the initial sprouting of seeds, which is not relevant for bulbs that are already established and have accumulated energy reserves for flowering. Rooting deals with the development of root systems, crucial for growth but not directly tied to the floral initiation in spring-flowering bulbs.