Most gardeners won't see their impatiens come back every year. Frost kills these tropical plants in a single night. They survive as perennials only in USDA Zones 10a through 11b. Everywhere else, you treat them as warm-season annuals and replant each spring.
The impatiens annual or perennial question has a tricky answer. In East Africa where they grow wild, impatiens live for years as true perennials. They bloom nonstop in warm, humid forests. But once temps drop below 32°F (0°C), their stems freeze and the whole plant dies. Most of the US gets frost, so here they act like annuals even though they aren't by nature.
I've saved my favorite impatiens by moving pots inside before the first fall frost. One coral walleriana lived on my kitchen windowsill for three winters in a row. It kept putting out scattered blooms from November through February. The flowers were smaller than summer ones. But the plant stayed healthy and burst with color each spring when I set it back outside.
You have three solid ways to keep your impatiens going year after year without buying new plants every spring.
Take Stem Cuttings in Fall
- When to cut: Snip 3 to 4 inch stem sections in September before nights drop below 50°F (10°C).
- Rooting method: Place cuttings in water or moist perlite and roots form within 10 to 14 days in a warm spot.
- Big benefit: Cuttings root fast and give you exact copies of your favorite colors and patterns for free.
Bring Containers Indoors
- Timing matters: Move pots inside two weeks before your average first frost date so plants can adjust.
- Light needs: Place near a bright window with at least 4 hours of light and cut back on watering.
- Pest check: Look for aphids and spider mites on all leaves before you bring plants near your houseplants.
Allow Self-Seeding Outdoors
- Where it works: Self-seeding does best in Zones 8 through 11 where soil stays warm enough for sprouts.
- How it happens: Ripe seed pods pop open and fling seeds into the soil for volunteer plants next spring.
- Disease warning: Downy mildew oospores persist in soil for years, so self-seeded walleriana may carry the disease.
Overwintering impatiens saves you $30 to $50 each spring on new plants. The key is acting before cold weather arrives. Once frost hits the stems, you can't reverse the damage no matter how fast you move them inside. Mark your first frost date on the calendar and work backward by two weeks.
If you live where impatiens grow as perennials, watch for volunteer seedlings each spring. These self-sown plants fill gaps on their own. They may not match the parent's exact color, though. Pull any seedlings with yellowed or curling leaves since those could carry downy mildew from the soil.
Whether you take cuttings, move pots, or let nature do the reseeding, you can enjoy impatiens for more than one season. I've kept the same coral line going for four years now through fall cuttings. That small time investment each September pays off with free plants and familiar colors that greet you again the next year.
Read the full article: Impatiens Flowers: Varieties and Care
