The serissa (Serissa japonica), known as the tree of a thousand stars, is one of the most charming flowering bonsai, covered in tiny white star-shaped blooms much of the year. It's also famously dramatic. A serissa will drop its leaves at the slightest change in light, temperature, or watering, which alarms new owners to no end. Here's the secret: don't panic. It almost always bounces back. Keep its conditions steady and this beautiful little tree will flower for you again and again.
Serissa care at a glance
| Light | Bright light, some direct sun. High light keeps it blooming |
| Water | Keep evenly moist. Don't let it dry out or stay soggy |
| Temperature | Warm. Bring indoors below about 55°F |
| Indoor or outdoor | Outdoors in warm months, indoors for winter |
| Soil | Well-draining bonsai soil |
| Fertilizer | Regularly through the growing season |
| Difficulty | Intermediate. Easy care, but it tests your nerve |
The serissa's dramatic streak (and why not to worry)
Let's address the famous quirk first. Serissa are sensitive plants, and almost any change in their environment (a move to a new spot, a shift in light or temperature, a change in watering rhythm) can make them shed leaves, sometimes dramatically. New owners often think they've killed the tree. They usually haven't. Give it steady, consistent conditions and a little patience, and it will releaf and carry on. The single best thing you can do for a serissa is find it a good spot and leave it there.
Light and placement
Serissa are really outdoor trees that tolerate a winter indoors. They love bright light and some direct sun, which fuels their prolific flowering, so give them the sunniest spot you can outdoors in the warm months. When temperatures start dipping below about 55°F, bring your serissa inside to a bright window for the winter, and try not to shuffle it around once it settles.
Watering
Keep a serissa evenly moist. It doesn't want to dry out completely, and it doesn't want to sit in waterlogged soil either. Check daily and water when the surface begins to dry. Since inconsistent watering is one of the things that triggers leaf drop, a steady rhythm matters more here than with most trees.
Humidity
Indoor air is dry, so a serissa appreciates humidity. Mist it often when it's inside, with one important exception: don't mist the flowers. Water sitting on the delicate blooms causes them to rot. A humidity tray under the pot is a good flower-safe alternative.
Fertilizing
Feed regularly through the growing season with a balanced bonsai fertilizer, since nutrients wash out of the soil with each watering. Consistent light feeding supports the near-constant flowering.
Pruning, flowers, and wiring
Serissa grow fast and take well to shaping. Trim and pinch new growth as it appears to keep the tree compact, but never strip off all the new growth at once. Remove spent, fading flowers to encourage the tree to keep producing more. You can wire to shape during the spring and summer growing season; the branches are flexible and respond well.
Repotting
Repot periodically for fresh soil, when you see roots beginning to grow out the sides or bottom of the pot. Spring is the ideal time. One quirky note: serissa roots and bark can give off an unpleasant smell when cut (the species is sometimes called Serissa foetida for exactly this reason). It's harmless, just don't be alarmed.
Common problems
Sudden leaf drop. The serissa signature, triggered by a change in light, temperature, or watering. Don't panic and don't overreact. Restore steady conditions and let it recover; resist the urge to repot or heavily prune a stressed tree.
Few or no flowers. Usually not enough light. Give it more sun and remove spent blooms to encourage new ones.
Aphids, mites, or scale. Serissa are more sensitive to condition changes than to pests, but these can appear. Treat aphids and mites with insecticidal soap or neem, and scale (brown or black bumps on branches) the same way.
Not sure what's wrong? Send us photos before making big changes. With a serissa, steadiness beats intervention nearly every time.
FAQ
Why is my serissa dropping all its leaves?
Because something changed: its location, the light, the temperature, or the watering. It's stress, not death. Serissa are famous for this. Keep conditions steady and it will releaf.
Is a serissa bonsai indoor or outdoor?
Both, seasonally. It's happiest outdoors in warm months and should come inside to a bright window once temperatures drop below about 55°F.
How often should I water a serissa?
Keep it evenly moist, watering when the surface starts to dry, usually daily in warm weather. Avoid both drought and sogginess, and keep the rhythm consistent.
Why isn't my serissa flowering?
Most often too little light. Serissa bloom best in bright sun. Give it more light and pinch off spent flowers to encourage new buds.
Is the serissa the same as the snow rose?
Yes. Serissa japonica goes by several names, including snow rose and tree of a thousand stars. See our snow rose care guide for more.
Ready for your own flowering bonsai?
- Shop flowering bonsai trees, including thousand-star serissa
- Set yours up right with bonsai soil and potting supplies
- Prefer to learn hands-on? Join a workshop at the nursery
- Download this care sheet as a PDF