When properly cared for, a bonsai tree can be a wonderful addition to your home and family. A single tree can live for a century or more, while ever so slowly expressing its own personality through its growth and changes over the years.Unfortunately, like others in your household, a bonsai can fall prey to a number of common ailments. The good news is that these trees are relatively hearty, and most common diseases can be taken care of. As with all living things, the key is to be …