Native to tropical and subtropical parts of the Americas, Rhipsalis baccifera grows in humid forests, often above ground on tree branches. That habitat explains why it prefers a light, airy substrate that holds some moisture but drains freely, rather than dense, dry desert-style soil.
Its roots are relatively fine and adapted to quick access to air and moisture, not long periods in compacted, soggy material. The best soil for Mistletoe Cactus is sandy or loamy with plenty of organic matter, giving a balance of moisture retention, oxygen, and gentle acidity.