I am an industrial hygienist and am called to investigate many mold and poria problems here in southern, CA. A quality remediation contractor is the real key. Removing all infected wood, keeping the area dry (removing planters), treating surrounding non infected wood with Timbor or another similar product should do the trick. Email me if you have any questions.
I've seen about 12 houses so far in the past 2 years with poria. It sure is a destructive fungus.