What are those?
Out of the 60+ plants I have in my home these guys seem to get all the attention. The Marimo Moss ball- but actually not a moss at all! These guys are actually a form of macro-algae, like aquatic algae or seaweed. Commonly found in cold, freshwater lakes throughout the Northern Hemisphere. Within its natural habitat this algae gets its shape as floating pieces are caught within the current which rolls them around; ultimately resulting in the spherical shape you are use to seeing. But did you know that this is not the only way they grow? A large number of them can also be found growing on lake beds creating almost a carpet like appearance; covering everything from rocks to debris. 

Care Guidelines to Follow:
  • Keep in an open container to allow fresh air exchange.
  • Low-bright indirect light will do just fine, but avoid direct sun as this can scorch the filaments.
  • Always use cold water, and replenish every 1-2 weeks depending on algae growth (dirty water).
  • I always recommend rotating these guys daily, or every other day. This will ensure that all parts are actively photosynthesizing, and will also help maintain its shape. 
  • When changing the water I also rinse each Marimo to get rid of any debris that might be on them. I then roll them in my hands to help encourage the round shape in case any have started to unravel (which is perfectly normal since we can't provide those natural currents that roll them). Therefor, we gotta do what we can do help them out!
  • Ever notice the Marimo browning? This could occur if one side hasn't been exposed to light long enough. Or if it's very dirty. Adding some aquarium salt to the water may help bring back it's greener hue! 
    • 1
    Erin I love the way you've displayed them!