When Do Syringa Bloom?

The syringa, or lilac, is a spring-blooming, deciduous shrub, native to Poland and Russia, which was introduced into the United States in the 17th century. The fragrant varieties of syringa number into the hundreds, with differing sizes, flower types and colors.

Time Frame

Bloom time for syringa is from late April to mid-June, depending on the variety, and flowers last only a couple of weeks. Enjoy the beauty and fragrance for a longer period by using several varieties that bloom at different times.

Types

There are many types of syringa, from compact bushes to tall lilac trees. The varieties include Japanese tree lilacs (Syringa reticulata), which bloom May through June and grow up to 30 feet in height, with branches spreading up to 25 feet across. The Peking lilac (Syringa pekinensis) blooms in June, producing fragrant white flowers against dark green foliage and growing up to 18 feet tall. Miss Kim Korean lilac (Syringa petula) reaches 8 feet tall, has dark green, dull foliage and blooms in May, producing long, purple flowers.

Blooming Tips

To produce the best blooms, provide a location for lilacs that offers full sun and soil that drains well. In early spring, fertilize lilacs with 5-10-5 nitrogen-phosphorus-potassium content to encourage blooming. Higher nitrogen content may produce more foliage and fewer flowers. Deadheading and annual pruning will keep syringa looking well-groomed.

References

• Cornell University Cooperative Extension Nassau County: Home Grounds Fact Sheet - Lilacs (Syringa)
• Oregon State University Department of Horticulture: Landscape Plants - Images, Identification and Information - Syringa patula "Miss Kim"
• Virginia Cooperative Extension: Lilacs, Syringa spp.; Alex X. Niemiera; Nov. 3, 2010