Knight's Plume Moss (Ptilium Crista-castrensis) is a perennial moss in the Pylaisiaceae family with moderate care difficulty. It requires moderate watering and partial shade or full shade or dappled_shade light in USDA hardiness zones 2-7. This plant is safe for cats and dogs. It can be grown indoors.

Ptilium crista-castrensis is a moss species known for its feathery, plume-like appearance, commonly found in boreal forests.