This plant prefers full sun. In the shade the flower production will suffer. The plants in my yard are getting shaded and only bloom on the top branches because of the shade.
Moisture
average
Soil & Site
average
Flowers
dark purple buds, lighter two tones when in bloom, single flowers, blooms after the more commonly grown Lilacs
Fruit
beaked dehiscent capsule
Leaves
simple, green leaves, not as glossy as many other Lilac, little if any fall color, may suffer from powdery mildew in the fall, best planted where it has good air circulation, multiple stems
Dimensions
up to 10 feet, the plants in my garden are slow compact growers as is stated in the literature, too large for use near the house, best used as specimen plants or in shrub borders, can be used in corner plantings as long as given 6-8 feet from the corne
Maintenance
Since Lilacs bloom on next season’s wood, prune after they are done blooming. There are many different ways to prune a Lilac. The most drastic is to cut them down to the ground. I have had ones sucker back and regrow while others that didn't make it using this method. You can cut out the old stems and let the new suckers fill in thinning them to the desired amount. On many old plants we have removed all the suckers and left a few of the old stalks. Pruning them up to bare base stems, turning the plant into a small tree. Drastic pruning may delay flowering a few years
Propagation
dividing off a sucker, soft softwood cuttings, grafting
Cultivar Origin
Isabella Preston, Central Experimental Farm, Ottawa Ontario Canada, 1936.
Misc Facts
Has been placed in the Vilosa group. (syn. Syringa x prestoniae 'Royalty')