The Bottlebrush plant (Callistemon) is a true Australian beauty. Down Under, it never has to deal with a harsh frost, but if you’re growing it as a perennial here in the States, it’s a different story. To keep this stunner alive, you’ve got a little work ahead of you—this plant definitely needs a helping hand to survive the winter.
Bottlebrush plants can’t handle the freeze
The Bottlebrush is not cold-hardy. Since temperatures in most of our zones regularly dip below freezing, leaving it outside unprotected is a death sentence. This gorgeous plant deserves to live for years, though! The best way to ensure it survives is to grow it in a container so you can move it. You’ll want to start thinking about moving it indoors as early as September.
Finding the perfect winter spot
Because the Bottlebrush is an evergreen, it needs light all year long. That means its winter home has to be bright. Here’s a good rule of thumb: the warmer the room, the more light it needs. Ideally, you want to keep it in a spot between 40°F and 50°F (5–10°C). Just make sure it’s not sitting in harsh, direct sunlight. A room with accessible windows is perfect so you can let in some fresh air occasionally.
Winter care tips
Your plant needs at least a three-month dormant period during the winter; otherwise, it won’t bloom next season. Since it keeps its leaves, you can’t just “set it and forget it.” Here’s your winter checklist:
- Water regularly—the root ball should never dry out completely.
- Open the windows for a quick breeze (ventilation is key).
- Keep an eye out for pests.
- Remove any dried-out bits as they appear.
- Stop fertilizing!
Pro Tip:
A lot of gardeners prune their plants heavily before winter to save space, but hold off on pruning your Bottlebrush. It has already set its flower buds for next year. If you cut it back now, you’ll be cutting off next summer’s show!
Waking up for spring
When the weather starts to turn, get your plant ready for the growing season like this:
- Repot it with fresh soil.
- Clear away any dried leaves or dead stems.
- Slowly start fertilizing again.
- Gradually increase the amount of water.
Don’t leave your Bottlebrush outside for good until mid-May (after the last frost). Even then, make sure to introduce it to the sun gradually so the leaves don’t get scorched.
Can it stay outside?
If you don’t have a bright, cool room and you live in a very mild region, you might get lucky keeping it outside—but only if the temperature stays above 23°F (-5°C). You’ll still need to wrap the pot and the trunk in fleece or bubble wrap and cover the young shoots with a burlap sack. Even in the cold, don’t forget to check that the roots haven’t dried out!
