Bill,
You're mixing Apples and Oranges here.(Sorry I couldn't resist)
The trees(Yes they are both trees)are Hedge Apple and Trifoliate Orange.
The Hedge Apple is Maclura pomifera (AKA Osage Orange)
The Trifoliate Orange is Poncirus trifoliata (AKA Hardy Orange)
Both would make spiny hedges, though I think the Osage Orange
would be a little large for that purpose cuz it can get 50' tall and
40' wide. Trifoliate Orange is about 20' high and 10' wide. It is hardy
to -20F. so zone 6a is about as far North as I'd try to grow it.
Bill Nourse wrote in article
<MOD$990228.15254@rec.gardens.ecosystems>... > > Several years ago, I remember reading about a "living fence" that was > used as a security/perimeter planting at certain sensitive government or > military installations where high-impact barbed-wire or chain-link fence > might not be appropriate or cost effective. It seems to me that the > shrub was a relative of the Osage Orange and was called "trifoliate > something-or-other," but I haven't been able to find anything on the Web > about it. > > It had thorns about 3" long and was supposed to be an effective barrier > against human intruders and larger animals if properly planted and > developed. It flowered in the Spring, did not bear edible fruit. Over > time, it would grow into a dense shrub that would actually stop a > vehicle if it got big anough and intertwined with adjacent shrubs. I > think it was touted as "living fence" by some industrial security > professionals. > > Does anyone know what I'm talking about, and where/if it is available > commercially? > > -- > Charles W. ("Bill") Nourse, Ed.D., CPP > Memphis, Tennessee USA > ICQ # 28643422 > http://personal.mem.bellsouth.net/~nourse > > "Establish yourself in God and then you will be helpful to others." > -- St. Seraphim of Sarov > > >