Hoya Callistophylla are epiphytic vines, meaning that they grow on the branches of trees in nature. The roots of epiphytes typically need very well-draining soil to prevent root rot. Hoyas will typically be happy with average household humidity but added humidity is a plus. This plant should be fertilized monthly through the spring and summer with a diluted general houseplant fertilizer. Cuttings can be rooted in water or soil. prefers bright indirect light. Brighter light will result in better color of the foliage but avoid direct sun which may burn the foliage.