Here is a tip to avoid mildew from developing. When you use futon as a sleeping cushion on tatami mats, make sure that you fold it every time you have risen and do not leave it spread out on.

It is also advisable to air futon regularly to get it dried.

In Japan with high humidity, we do not leave futon spread out.

If you make it a habit to fold it after use and air out your room at right intervals, you do not get any mildew. 

Igusa series features a green color. Please note that igusa is a natural material, so it starts out green but over the years it changes into honey-color affected by sun.

Laying out tatamis of the same color in different directions alternatively offers staggered reflections in sunlight that make it look like you have two diffrent tone tatamis laid out―deep and light color tatamis. This type of layout is called “Ichimatsu-shiki (checkered floor).”