Japanese Tree Lilac Plant Care
Syringa reticulata (Blume) H.Hara
Syringa reticulata, the Japanese tree lilac, is a species of flowering plant in the family Oleaceae. It is native to eastern Asia, and is grown as an ornamental in Europe and North America.
Every 7–10 days
Full sun to partial shade
0–90°F
40–70%
What Is the Japanese Tree Lilac?
Japanese Tree Lilac (Syringa reticulata) belongs to the Oleaceae family within the Syringa genus. Japanese Tree Lilac is native to eastern Asia. Japanese Tree Lilac is also known as Tree Lilac, Reticulated Lilac.
Japanese Tree Lilac displays a deciduous shrub or small tree growth habit, reaching up to 10 inches tall with a spread of approximately 8 inches. Japanese Tree Lilac produces fragrant clusters of tubular flowers in various colors.
Leaf size: approximately 4 inches.
How Often Should You Water a Japanese Tree Lilac?
Syringa reticulata requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Japanese Tree Lilac Need?
Japanese Tree Lilac thrives in full sun to partial shade light conditions. The optimal light range is 2000–5000 lux. Avoid placing Japanese Tree Lilac in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Full sun to partial shade
2000–5000 lux
What Temperature and Humidity Does the Japanese Tree Lilac Prefer?
Syringa reticulata grows best at temperatures between 0°F and 90°F. Japanese Tree Lilac prefers humidity levels of 40–70%.
Temperature
0–90°F
Humidity
40–70%
What Soil Mix Works Best for a Japanese Tree Lilac?
Well-draining, fertile soil with a slightly acidic pH. Good drainage is essential for Japanese Tree Lilac to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Japanese Tree Lilac?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Japanese Tree Lilac?
Japanese Tree Lilac can be propagated through softwood cuttings, layering. Similar propagation techniques also apply to lilac bush plant care, which shares the same genus.
Fertilizing
Every 6 months
During the growing season
Is the Japanese Tree Lilac Toxic to Pets and Children?
Non-Toxic
Non-toxic to humans and pets
What Pests and Diseases Affect the Japanese Tree Lilac?
Japanese Tree Lilac is susceptible to aphids, powdery mildew. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Keep exploring plants
Japanese Tree Lilac is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Syringa genus — compare its care with other Syringa species on PlantoScan.
Japanese Tree Lilac tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
More Syringa Species
Other Syringa species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
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