Care Guide for a Chinese Myrtle Bonsai (Syzygium buxifolium)
The Chinese Myrtle (also often sold as Brush Cherry or Syzygium) is a popular, fast-growing subtropical species prized for its small, glossy leaves, compact habit, and occasional small white flowers followed by pink-red berries. It is sensitive to cold and must be protected from frost.
Category, Requirement, Detail , Placement & Sun
Full Sun (Summer)
Place outdoors in full sun during the growing season (late spring to early autumn) for best health, small leaves, and tight growth.
Winter Care
Frost Protection
Must be brought indoors when temperatures drop below 10C. Place in a cool, bright area (e.g., an unheated conservatory or very bright windowsill) where temperatures stay above freezing.
Watering
Consistent Moisture
Water thoroughly when the top layer of soil begins to feel dry. It likes moisture but must not sit in soggy soil, which leads to root rot. Use a humidity tray indoors.
Soil
Well-Draining
Use a fast-draining bonsai mix (e.g., Akadama, Pumice, Lava Rock) to ensure aeration while retaining some moisture.
Fertilisation
Heavy Feeder
Fertilise with a slow-release organic fertiliser every 1–2 weeks during the active growing season (spring to early autumn). Reduce or stop feeding during the cooler winter months.
Pruning
Cut and Grow
Prune back long shoots to 1–2 sets of leaves once they have extended to 4–6 sets of leaves. It back-buds readily on old wood. Heavy structural pruning is best done in late winter/early spring.
Wiring
Easily Scars
Wire can be applied anytime, but the tree thickens very quickly. Monitor wires weekly and remove them as soon as they begin to bite into the bark. Use copper or aluminium wire.
Repotting
Frequent
Repot young, vigorous trees every 1 to 2 years; older trees every 2–3 years. Repot in late spring when the tree is actively growing. Prune roots moderately.
Pests/Diseases
Monitor
Watch for Aphids and Spider Mites (especially when kept indoors in dry air). Treat with insecticidal soap or horticultural oil. Root rot is the main disease risk (due to overwatering).