Date: Thu, 10 Jun 2010 09:29:12 -0400 (GMT-04:00) From: Allison Weakley Subject: trifoliate orange I concur with Al and Sam that trifoliate orange is an invasive plant in Chatham County.  This species (Poncirus trifoliata, aka Citrus trifoliata) has invaded floodplains along Robeson Creek in Pittsboro (where it forms dense thickets),Continue Reading