Commensalism occurs as one species lives in a direct association with another, gaining shelter or some other environment requisite for survival and not causing harm or benefit to the host.
Parasitic plant-plant interactions are harmful to the host. ... Strangler fig is a tree that germinates high in the host tree and sends roots to the ground, eventually killing the host when the fig roots and vines surround and strangle the flow of sugars in the host
