Garden Talk

In the blink of a few weeks the experimental green manure patch of Phacelia tanacetifolia has gone from this to this: The heat and drought has rushed the crop through to maturity.  So now what do I do with it?  Wait? Chop it up and fork it in? How long before I can sow again? Won't that patch be forever sowing itself with more phacelia?  Have I literally lost the plot? I have put this on Twitpic too and hope, hope, hope for some sage advice.