And they are subject to the forces of nature, and so will need to be pruned, lopped or topped from time to time, and may become diseased, or dangerous, or die.
Maent hefyd yn ddarostyngedig i rymoedd natur, felly bydd angen eu tocio neu eu brigdorri o bryd i'w gilydd, a gallant ddod yn afiach, neu'n beryglus, neu farw.