Probably not ideally suited for your climate. They may be root hardy there but PA is hardly Corsica :-) Or Sardinia. They dislike winter wind and probably not all that happy with much of a snow pack. And they tend to bloom quite early - several months earlier than x hybridus in my climate - so flowering could be easily impacted negatively by cold. And I would consider this a full sun plant.

Don't know how many other Mediterranean-type plants you grow in PA, but I would not think that a great climate for those sorts. Especially this past winter!

Did you ever notice if the bloom buds form in the fall and then freeze dry in the spring?
I think some of the hybrids I have share argutifolius genes and the blooms don't look too good this spring, dried up and dead. The plants do fine but some years (especially this one) I don't think I'll see any flowers make it.

I grow it successfully here in zone 4, six years running. I throw a bucket of leaves over the top of the plant and the flower scape (they do set their flowers in the fall), and then put a piece of plastic over that which I weigh down with rocks at the four corners. Takes about 3 minutes per plant. I remove the plastic first, then the leaves a week or so later whenever I guess that spring has arrived. Works like a charm.

this stemmed species is bud hardy to zone 7, but if temps are real low for a long period as with this past winter, the stems become damaged. I lost one but another, covered with snow and leaves MOST of the winter is blooming very nicely. This one does not live as long as the orientalis.