Hart's-tongue Thyme-moss (Plagiomnium Undulatum) is a perennial moss in the Mniaceae family with easy care difficulty. It requires high watering and partial shade or full shade or dappled_shade light in USDA hardiness zones 3-8. This plant is safe for cats and dogs. It can be grown indoors.

Plagiomnium undulatum is a moss species characterized by large, tongue-shaped, undulate leaves with a prominent nerve, growing on erect, branched stems.