Syringa 'Belle de Nancy'The Syringa vulgaris Belle de Nancy is a deciduous tree more commonly known as a French Lilac Tree. This variety has heart shaped green foliage which is accompanied by highly fragrant double flowers, these panicles are pink and purple. The Syringa vulgaris Belle de Nancy has an upright habit; this variety is hardy and will thrive in most soil types. The French Lilac Tree is best planted in a full sun or partially shaded location.