Unlike annuals that demand replanting every season, perennial varieties return year after year, keeping your garden green while sparing you from time-consuming planting. That's where perennial kale (Brassica oleracea var. Instead of reseeding traditional kale each year, you can grow this long-lived variety from a cutting or a seed to enjoy a harvest that won't fade after just one cycle. It's an easy way to stretch your efforts, and once it's established, perennial kale thrives with minimal upkeep. The benefits of growing perennial kale in your garden extend beyond just convenience.