Plants use the following methods to get rid of excretory products:

• They can get rid of the excess water by transpiration.
• Many tissues in plants are made of dead cells, they get rid of by decaying leaves.
• Some excreted products are stored in the dormant xylem as gum.
• The excretory substances tannins, resins, and gums are stored in the bark and destroyed by the removal of the bark.