Ophiopogon plan Black dragon has to be one of the toughest and most indestructible garden plants there is, It's fully hardy and no maintenance is required at all. Despite being called a 'grass', Ophiopogon is in fact a strappy leaved perennial. It is one of the very few so-called 'black' plants that are actually black – a year-round matt black backdrop to set off bolder and brighter garden features. It is a very slow-spreading, carpet-forming plant, and can remain undisturbed for years, eventually forming a fair-sized clump. You can then chop it up with a spade in spring and create many more plants for free!