Tree of the Week: Japanese Tree Lilac Syringa reticulata

Presented by the Department of Urban Forestry, 474-TREE

Introduced to the plant community in 1876, the Japanese Tree Lilac is native to Northern Japan. The Latin name Syringa is actually derived from the Greek word ?syrinx? meaning ?hollow stem?, and ancient Greek doctors supposedly used these stems to inject medications into their patients or bleed them. Thus, doctors today use ?syringes.? ?Reticulata? in Latin means net-like veins, so the literal translation is a hollow stem with net-like veins. Tree Lilac is a member of the Olive family as are forsythias, privet and ash. Lilacs, as a whole, have been part of American gardens since Plymouth Rock, and if you appreciate them, then consider the Tree Lilac.

This plant can reach mature heights of 25-30? with a spread of 20-25?, and is hardy from zones 3-7. Lilacs do not do well beyond zone 7 because they do not like intense heat. The Tree Lilac has a somewhat oval to rounded appearance with branches and leaves having an arching habit. Leaves are opposite on the stem, simple in leaf margin, 2-5.5? long and dark green. This plant can grow 9-12? over a 6-8 year period. The flowers are perfect, creamy, white, fragrant and opening now through mid-June. Lilacs, as a group, prefer well-drained soil that is slightly acidic, but are pH adaptable. They prefer full sun for best flower, but do alright in partial shade. Tree Lilac has a sizable list of diseases and pests including blight and mildew, so keeping your tree open in the crown for air movement is a must, but the Tree Lilac is actually the most trouble-free lilac of the group.

This plant is ideal for a specimen or accent plant in your landscape or in small groupings. It also does well next to large buildings and as a small to medium street tree especially when planted under power lines. Many people like to put a screen in front of their house, but forget about the overhead power lines, and this is ideal for this. When a lot of other Spring blooming trees are finished, the Tree Lilac is just getting started, and will help to add to your year round garden design. For further questions, please call the Department of Urban Forestry at 474-TREE (474-8733).