Originally Posted by JoeLindley
In general, with microbial mixes like WLP670, a starter is not recommended. Yes, going with the 670 in primary for 5 months and then 1 month in bottles should give you what you want.
WLP670 is not a 'microbial mix', it is just a mixture of 2 yeasts. The sacc will be the dominant strain and reproduce aerobically, while the slower brett will be slow and be left to reproduce anaerobically ... which is what you want.
Making a starter will just strengthen the sacc (which is what you want) while the brett will not change much. For a sacc/brett mix like WLP670, I would recommend a starter; you still want the beer to get off to a decent start.