The Syzygium bonsai (also called brush cherry) is an evergreen tree originating in Australia and New Zealand. Some will bloom white flowers in spring and bear edible red berries in autumn. It thrives in warm climates and can not tolerate frost. The Syzygium likes a consistent, humid environment, so a dry, drafty apartment is not ideal for this bonsai. This tree needs plenty of sun, but also requires protection from heat and cold.
Position & light: The Syzygium bonsai is primarily an outdoor bonsai, but it needs to come indoors or put in a greenhouse during the winter months. The tree requires ample sun, but shade and protection from hot temperatures. It’s important to keep the temperature of the bonsai’s environment relatively constant and above 30ºF..
Watering: Water the Syzygium thoroughly when the soil is dry to the touch. Use distilled water if your tap water is hard or alkaline.
Fertilizing: Fertilize the Syzygium bonsai with an acid-based fertilizer from spring to autumn twice a month. Then fertilize once per month during the winter. Don’t fertilize the Syzygium when repotting because it is in a weakened state and it can burn the roots.
Pruning: To ensure the bonsai tree keeps its compact size, regular trimming must occur. Trim new shoots with 6-8 pairs of leaves down to 1-2 leaves, making a smooth cut.
Wiring: We don’t recommend wiring Syzygium bonsai because better shaping results from frequent trimming than wiring. If wiring is chosen, use the thinnest wire that will hold the branches in place and use great care in wrapping loosely so as not to scar the branches. Trim the wire off with shears or you might break branches trying to unwind it.
Repotting: The Syzygium needs a root trim and repotting every 2 years. Prune the roots and use an acidic soil to repot.