Notify USCIS within Ten Days of Moving. As a green card holder, you are required to advise the USCIS of a change of address within ten days of moving. Accordingly, one of the easiest ways to violate the law, even if it seems overly technical, is to fail to update your address with the USCIS.
The yerba mate plant is grown and processed in South America, specifically in northern Argentina (Corrientes, Misiones), Paraguay, Uruguay and southern Brazil (Rio Grande do Sul, Santa Catarina, ParanÃ¡ and Mato Grosso do Sul). Cultivators are known as yerbateros (Spanish) or ervateiros (Brazilian Portuguese).
There are many traditions regarding the mate. As you mention, not stirring the yerba is one of them. When you stir the yerba (usually with the bombilla) water pours in among the yerba sticks, washing away its flavor. That will lead you to a less tasty and more bitter mate. In that case, you would say that the mate estÃ¡ lavado (the mate was/is washed). You are required then to change the yerba.