when i was in Maine, I worked occasionally in the Summer as a Blacksmith at King's Landing, New Brunswick, as a museum curator and on occasion helping out when there was a shortage of help at the Olsen House in Cushing Maine. the Olsen house was the house in the Painting: Christina's World, by Andrew Wyeth. One day, while waiting for a ride home, I dug a couple of sprouts out of the gravel driveway at that house. the result was these wonderful white Lilacs. I am afraid that the light was not strong when I took these photos, and all are a bit back lit.
These photos are Lilac: 'Krasavitsa Moskvy' or Pride of or Beauty of Moscow. The pictures do not do it justice. It is basically a white lilac, but it has a flush of orchid pink.
We have a purple lilac, but I cannot tell if it is on my side of the boundary or the neighbor's. I wish I could get a baby from Grammie's lilacs but if not, my next lilac will be Mr. Lincoln...very dark purple. Shelbourne Museum in Burlington has a large display of lilacs. They were among the most loved and widespread of plants in 18th and 19th century American yards, and very hardy in the coldest regions.