"Georgetown Tea." I too thought this rose was Mme Lambard by comparison with a photo; others now say it's Mme Antoine Mari, but it seems to me on slight evidence that the Mari has fewer petals than this not-full rose..A final, probably faulty conclusion is that it's a sport or seedling from Mme Lambard.
Plan plenty of room for this monster. It has many of the virtues attributed to it: flowers large and many, health, ease of propagation (this an accident--it touched the ground & a new plant started). No need to spray. The flowers are almost 'full', this not showing the strong fragrance ascribed in other mss here.
The best flower colors come in autumn. Not a show rose, too few petals.
In about 15 years mine grew 20' across (it grows along a stone terrace), by about 10'. It covered a Japanese maple on the terrace below it--one I disliked (wrong plant, wrong place)--, its roots probably were the killer of a nice Mons. Tillier, and was impenetrable beneath, sheltering a grove of pokeweed, hellebore which self-seeds mercilessly, a 3' volunteer ailanthus, and other interlopers.. While its thorns are ordinary in length and number, there was too much of it to escape a good stabbing, so that after gardening your skin looked like you had measles. I age. I can't dance around it or play Tarzan, must simplify. This year I cut it to the ground.
However: If you live in a warm climate, want a huge Tea plant with lots of flowers as a center yardpiece, esp. Spring and Fall, just to one-up the neighbor's new magnolia, & not really planning to be a constant gardiner, try Georgetown Tea.