To answer the big question right off the bat: Yes, they absolutely are! In fact, Hostas are some of the toughest perennials out there when it comes to the cold. Even arctic temperatures won’t faze these plants, provided you give them a little TLC starting in the fall.
No sweat, even at minus 15 degrees Fahrenheit
Most Hosta species are originally native to the Japanese islands. Just like here in the States or in Central Europe, they get some pretty brutal winters over there. Because of that, these plants are naturally adapted to handle a major temperature drop during the off-season. If they are in a well-protected spot in your garden, they can easily handle temperatures as low as -15°F (or even -25°C) without breaking a sweat.
Hunkering down underground
During the winter, Hostas survive as a root system tucked safely away in the soil. The parts of the plant above ground will die back once the frost hits. My best advice? Leave that fallen foliage right where it is! It acts as a natural insulation layer for those extra-chilly days and nights. If you aren’t a fan of how the decaying leaves look, you can clear them away and swap them for these alternatives:
- Brushwood or evergreen branches
- Bark mulch
- Garden fleece or frost blankets
A heads-up for container gardeners
If you’re growing your Hostas in pots or containers, the roots are a bit more exposed and need some extra protection. You’ll want to wrap the pot in garden fleece, burlap, or a coconut fiber mat. It’s also a good idea to move your containers to a sheltered spot—like against a house wall—to block the worst of the winter wind.
Prep work and spring cleanup
To get your Hostas ready for their winter nap, make sure to snip off the old flower stalks. Once fall hits, stop fertilizing altogether and cut back significantly on watering. You can start your feeding routine again in March or April. That’s also the perfect time to clear away any leftover debris from last year to make room for that beautiful new spring growth!
