American holly (Ilex opaca) does quite well in NW NJ. Growing them from seed is
another matter. In general, the seed takes a LONG time to germinate. American
holly cuttings are pretty easy to root. If you want to plant a holly forrest I
suggest you concentrate on rooting cuttings.

I've done both, grown from seed and cuttings, feel free to email if you want more
info.

--beeky