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In page Olive:

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In situations where extreme cold has damaged or killed the olive tree, the rootstock can survive and produce new shoots which in turn become new trees. In this way, olive trees can regenerate themselves. In Tuscany in 1985, a very severe frost destroyed many productive and aged olive trees and ruined many farmers' livelihoods.[3] However, new shoots appeared in the spring and, once the dead wood was removed, became the basis for new fruit-producing trees.[citation needed]