Hello, Geo.
I have two mock orange shrubs (Philadelphus lewissi 'Blizzard')that I planted in the spring of 2005 and are hardy to Zone 3. Came back quite nicely this year; in fact, they are blooming right now. Not a mass of blooms for the first year, but enough to know that this is a fragrant variety as the nursery promised me.
Not sure where you live, Geo, but I picked these up at a Thunder Bay nursery - Landale.
Hope that helps.
Margaret

I have had a mock orange bush here for years. Don't know the proper name though, but it is blooming now. It grows like a weed too!

Debbie