Since it is considered an annual, plant the seeds in spring when the danger of frost has passed. Once they are established, nasturtiums will continue to spread and bloom until the first frost, with little more than the occasional sprinkling. Nasturtiums basically come in two forms: compact and trailing.
Are nasturtiums climbers?
Nasturtiums are either annuals or perennials, and can be low-growing bushy plants, trailing or even climbing.
Do nasturtiums grow back every year?
Nasturtiums are gorgeous, helpful companion plants with vibrantly colored blooms. Although they’re considered annuals, they easily re-seed themselves without intervention, so you know they’ll come back year after year.