Beautiful flowers and the trademark fragrance of lilac mark spring in many parts of the world. Hardy shrubs growing in USDA zones 3 through 7, they tolerate most soil types and make showy specimen plants.
Factors Affecting Growth
The International Lilac Society lists more than 2,000 cultivars with varying growth rates. Proper siting, soil condition, hours of daylight available, fertilising and watering are necessary for each type to achieve its best growth rate.
Fast Growth Rate
A fast growth rate is 25 inches or more per year, according to the Arbor Day Foundation. Chinese lilacs and hybrid cultivars S. x prestoniae and S. xjosiflexa are listed as fast growers.
Medium Growth Rate
Syringa vulgaris (common lilac) and Syringa reticulata have medium growth rates. According to the Arbor Day Foundation, this equals 13 to 24 inches per year.
Slow Growth Rate
Cultivars with slow growth rates put on 12 inches or less per year, according to the Arbor Day Foundation. Syringa meyeri Palibin (dwarf Korean lilac) and French lilac cultivars are listed as slow growers.