Korean Lilac (Syringa palibinaian) grows Hight and Spread about 5 ft, compact free flowering and here in UK is usually grown in rockery beds ect,, lilac coloured flower and grown in bunches / panicles about 1-2 inches longs from May-June.
Very pretty shrub for the right place, sun or part shade, fertile soil or add compost manure to planting hole.
Depending on your zone, these shrubs can be damaged at the tips of branches by hard frost.
Hope this is the one your looking for, it is a lovely shrub, Good luck. WeeNel.
Totally hardy here in zone 3 and very good, carefree shrubs here. (Curious that they would be grown in rockeries there, as they are very large shrubs (5 -6 tall and as big around)... ?) I posted some pix of the flowers and overall plant, I think, to the PF entry a while back .
You could but it would be much, much better if you didn't. Most people are not very skilled at pruning (hence all the abominations one sees on any neighborhood street). Aside from that, creating a maintenance necessity where there wasn't one to begin with is a bad idea.
If you want a small tree, it's really best to choose a small tree - this is a multi-stem shrub.