Compassion literally means to feel with, to suffer with. Everyone is capable of compassion, and yet everyone tends to avoid it because it's uncomfortable. And the avoidance produces psychic numbing -- resistance to experiencing our pain for the world and other beings.
My father always told me that plants and flowers have souls. How else could wise King Solomon have spoken to them? He wouldn't have had much conversation with them if they hadn't had souls! We have to respect all growing things even if we do not understand their ways.