Junior Marimo has the size of 2-3cm. Since marimo grows 0.5mm in 1 year, Junior Marimo is actually 4 years old.
You can expect it to grow into Giant ( 4-5cm ) in 2-3 years time. It is pretty interesting to have a pet that can grow with you and be passed over to the next generation if it is take good care of. Ever wonder how to make Marimo grows faster, check it out here.
Guess what, the biggest Marimo grows up to 95cm in 200 years.