need erosion help

Dear wise ones,
We recently had a large part of our 2 acre property regraded and are
facing erosion problems waiting for grass seed to grow.  We have an area
just in front, and to the side of, 1/3 acre of trees (at the back of the
property) that slopes down about 8' over 30', and the eroding area is
about 50'x50'.  We'll probably be putting up some erosion fencing this
weekend to contain runoff as much as possible. 
We are considering putting some large rocks back there and interplanting
with anything fast growing, fast spreading, relatively inexpensive and
not in need of mowing.  I have a mass of rudbeckia (sp?) from another
garden that might help. Any suggestions beyond that?  The area is
visible from the house but won't be part of the regular and frequent
"walk about the yard to see how things are doing".
Thanks in advance!
Barb  (Southeastern PA, zone 6/7, where bleeding hearts are blooming and
I'm happy!)
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