Like many other Philodendron species, the Philodendron Subhastatum also likes a warm environment and high humidity. Give the plant some water once a week and you don’t have to do more! Is the plant growing fast? Then it is advisable to re-pot the plant to a larger size and give it a moss pile. In wild nature, the plant often grows against trees. A mossy pole will certainly appreciate the Philodendron Subhastatum.
In short, the Philodendron Subhastatum is one for the real Philodendron collector.