LILAC

 Did you know that Lilac trees have a female and a male and if you plant one and there is not one of the opposite sex fairly close by, they will never bloom?! 

LILACS

PURPLE AND WHITE LILACS in a GREEN VASE ; SYRINGA JOSIKAEA

My search for Hungarian Lilacs turned up information that the plants bloom about 2 weeks after the Lilacs bloom in France.  How about this link BACKYARD GARDENER - HUNGARIAN LILACS for more information?

LILACS NEED MATES

My father tried to get a lilac tree going in our yard, and this particular lilac tree never grew, never died, never had blooms.  How disappointing! We wanted this tree because we had seen and smelled the glorious blooms of other trees in other yards.  Then one day someone told us that the tree would not bloom because it did not have a mate nearby enough.  We came to understand that with lilacs there are "males" and "females" (which we had, I do not know) and that they needed to be close by each other for one of them to bloom.