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Abscission What is it? Abscission is the process in which plants lose leaves, flowers, and fruit. These things break off the stem at a place called the abscission zone when the plant cuts them off with a waxy substance called suberin. The process of abscission is controlled by plant hormones. Give me an example! After the leaves fall off of a tree, examine the spot where they were attached to the branch. This is the abscission zone. You will notice that a leaf scar has formed out there, and it is made out of waxes like suberin. This leaf scar prevents the plant from losing moisture and prevents infection by parasites. Copyright ©2010, PCS Edventures, Inc. All Rights Reserved.