By Liz Baessler Is lilac a tree or a shrub? It all depends on the variety. Shrub lilacs and bush lilacs are short and compact. Tree lilacs are trickier. The classic definition of a tree is that it is over 13 feet tall and has a single trunk. Tree lilacs can grow up to 25 feet high and have a tree-like appearance, but their many stems tend to get them classified as bushes. They are not technically trees, but they get big enough that you can treat them as if they are. Lilac Bush Varieties Lilac shrub or bush varieties can be split into two categories: large upright and densely branched. In the first category is the common lilac, a hugely diverse plant that comes in a wide range of colors and fragrances. This large upright shrub lilac usually grows to 8 feet in height, but some varieties can be
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