aerial-roots banyan banyan-tree columnar-tree competing competitive constricting distinctive epiphytes external ficus fig growing growth power powerful root-system Roots strangle strangler strangler-fig strangling strength strong sub-tropical tree trees tropical clinging contrast contrasting creeper foliage greenery interconnected interlinked intertwined interwoven leaves light shadows shapes spread spreading sunlight sunshine surface surfaces vegetation vine wood woody abstract background care caution close-up colors colours contours groundcover hazard hazardous layers surfaced texture textured textures tripping-up twisted twisting uneven walking-hazard