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Word of the Week: Vernalization

Vernalization: In some species, flowers are formed in spring as a result of the plant […] being given a cold treatment, close to or at freezing temperatures, for several weeks. The physiological process is called vernalization (from Latin for “belonging to spring”).*

Spring bulbs, like these Allium christophii, require a vernalization period in the ground over winter. That’s why they’re planted in autumn.

 

*Capon, B. (2005). Botany for gardeners (Revised ed). Portland: Timber Press.

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