Gardeners across various climates often wonder about the fate of their seasonal blooms, particularly when it comes to vibrant and versatile plants like nasturtiums. The question "do nasturtiums come back" is a common one, and the answer is not a simple yes or no. It hinges entirely on your specific growing zone and the type of nasturtium you have cultivated. Understanding the difference between hardiness and annual lifecycle is the key to demystifying whether these cheerful flowers will return year after year.
The Annual Nature of Common Nasturtiums
For the vast majority of gardeners in cooler climates, nasturtiums (*Tropaeolum majus*) are treated as annuals. This means they complete their entire life cycle—from seed to flower to seed—within a single growing season. As warm-season plants, they thrive in the heat of summer but are highly susceptible to frost. When temperatures drop and the first hard freeze arrives, the above-ground foliage and stems will die back completely. In these regions, the plant does not come back from the roots; however, it leaves behind a prolific supply of seeds that can germinate the following spring if the seed bank remains viable in the soil.
Behavior in Warmer Climates and Zones
Hardiness in Zones 9-11
The narrative shifts significantly for gardeners in USDA hardiness zones 9 through 11. In these warmer regions, where freezing temperatures are rare or non-existent, nasturtiums can behave as short-lived perennials. Unlike true perennial flowers that maintain their structure and leaves year-round, these plants may enter a state of dormancy during the cooler, drier months. When temperatures warm up again, they often bounce back from the roots, producing new growth and flowers without the need to reseed. In this environment, the term "do nasturtiums come back" is answered with a resounding yes, as the plant returns year after year.
Managing Self-Seeding for Continuity
Even if you live in a region where frost kills the plant to the ground, you can create the illusion of a "returning" nasturtium patch. Because the plant is a prolific self-seeder, allowing a few flowers to mature and go to seed is an effective strategy. These seeds will fall to the soil and lie dormant until the conditions are right to sprout. In the following spring, you will often see new nasturtium plants emerge in the exact location, creating a natural reseeding cycle. Gardeners can encourage this by lightly scratching the seed coat or soaking the seeds before planting to improve germination rates.
Soil and Care Considerations for Regrowth
The longevity of nasturtiums, whether as annuals or returning perennials, is heavily influenced by soil quality and care. They prefer lean, well-draining soil; overly rich soil can promote lush foliage at the expense of flowers. In colder zones, applying a layer of mulch around the base of the plant in late fall can sometimes provide slight insulation to the roots, potentially aiding in survival. However, it is crucial to ensure the soil is not waterlogged during winter, as this can lead to rot rather than regrowth when the weather warms.
Differences Between Varieties
Not all nasturtiums are created equal when it comes to returning. While the common *Tropaeolum majus* is the most popular annual variety, there are other species worth noting. For example, *Tropaeolum tuberosum*, known as the flame flower or yam nasturtium, is a true perennial tuberous plant in its native habitat. This variety is more likely to return consistently in a wider range of climates, dying back to its tuberous root structure in winter and sending up new shoots in spring. Identifying the specific variety you have will give you the most accurate answer regarding its return behavior.
Encouraging Year-Round Growth
If you are hoping to see your nasturtiums return without relying on natural reseeding, there are specific steps you can take. In cooler climates, carefully digging up the tuberous roots (if you have a variety capable of it) and storing them indoors over winter is an option. Alternatively, taking cuttings in late summer can provide you with rooted plants to overwinter indoors, ensuring you have mature specimens ready to plant out as soon as the danger of frost has passed. This active management is the surest way to guarantee the plants return to your garden exactly where you want them.
