Syringa vulgaris 'President Lincoln' (Lilac)
Possibly the truest blue of any lilac, this French hybrid bears thyrses of single, medium blue flowers. It's a good grower that produces basal shoots readily. Rarely to never fed on by Japanese beetles.
Height: 8 to 10 feet
Spread: 10 feet
Shape: Upright
Exposure: Full Sun
Foliage: Green
Fall Foliage: Insignificant
Zone: 3-7