Very popular ornamental shrub successfully grown as a bonsai. The aromatic flowers appear from May to June and have a dark purple-red color.

Location

Lilacs are grown in full sun or partial shade. During the hottest weeks of summer, a little shade during midday and early afternoon is recommended, especially for small bonsai trees in shallow pots.

Soil

The soil should be kept slightly moist, avoiding complete drying out of the roots. Excessive moisture should be avoided. Lilacs prefer a pH between 5.5 and 7, but will tolerate some lime, so rainwater and regular tap water can be used. Use good drainage material to allow water to drain away from the container.

Temperature

Normal room temperature in spring and summer, and from the second half of fall, you should reduce the temperature to +7…+10 degrees Celsius heat.

Watering

Keep the soil moist, but do not overwater. Do not spray during flowering and in cool weather. During the resting period, water as the overlying soil dries out.

Fertilizer

Use a balanced solid organic fertilizer once a month or a liquid fertilizer once a week during the growing season. For flowering plants use high phosphorus and potassium content to stimulate flowering. Too much nitrogen will promote excessive shoot growth with long internodes and may reduce flowering readiness.

Repotting

Repot every 2–3 years in the spring or fall to renew the soil and root system.
About one-third of the rhizome may be removed at this time. Older and larger specimens can be transplanted at longer intervals.

Shaping and pruning

When the young shoots elongate to three to four internodes, it is necessary to cut them to one pair of leaves. Leaves that are too large can be removed throughout the growing season. Pruning of large branches is best done in early spring. Young shoots can be pruned during the vegetation period. Detailed wiring of branches and twigs is best done during winter dormancy when leaves are out of the way. Older lilac branches become stiff and brittle and should be wire-wrapped with great care.

Wintering

Lilac bonsais need protection from frosts.
Cold wintering at 0…+12 °C or in a frost sheltered room. Air humidity — not lower than 60%.

Diseases and pests

Unfortunately, lilac trees can be attacked by many pests and diseases: aphids, spider mites, fungal diseases. Inspect the tree regularly, paying attention to the underside of leaves and branch junctions, as pests often hide in these areas. Use appropriate preparations if necessary.   

Prevention

• Correct watering.  Overwatering can lead to root rot, and underwatering stresses the plant, making it more susceptible to pests and diseases.
• Enough sunlight and air circulation. A bonsai should receive the right much light and air to prevent the growing of mold and fungus.