Most request soil that is not allowed to dry out but is never wet, just moist. A complex organic soil mix is always appreciated by the philodendron. Organic fertilizers work very well. Here's a vine type climbing a tree. The selloum can be used in the sun but adapts even to deep shade.
Partial sun is best in appearance of leaves.
Philodendron speciosum looks similar to the sellom, but is larger and more robust. In the selloum, the leaves can be huge, as much as 4- 5 feet tall and almost as wide. The leaves grow off of heavy trunks that send down many thick strong aerial roots which stabilize the trunk's posture. Over time in the open landscape, this becomes a mass in the soil and above ground as well. However, most landscapers and landscape architects plant too many too close, often 2-3 feet on center.