Cover with about 1 inch of soil. From what I'm reading in Perennial Vegetables, it seems like this might be on the shy side size-wise for a viable root cutting, but if anyone has experience with propagation from cuttings, I would appreciate it. Plant them in the ground vertically, with the thicker end up. Sea kale arrives as root cuttings called thongs. Germination is variable even with fresh seed, typically 1–2 plants out of ten sown. Adapted to the cool British sea coast. Propagate by seed or root cuttings. If thongs arrive quite dry, they can be soaked in tepid water for a couple of hours. Sea kale is best planted out from May onwards, when the soil’s warmer. Raise in a partial shade nursery. Transplant deep to prevent drying out. Crambe maritima## HOW TO GROW SEA KALE Start indoors 8–10 weeks before last frost or direct sow in late April in the PNW. Noteworthy Characteristics. In hot climate, grow in shade house with daily cooling water. I love this plant. Latin: Crambe maritima. Howdy, Someone had gifted me with this root cutting of Sea Kale, just a couple days ago. They had vigorous growth. Crambe maritime, commonly known as sea kale, is a robust mustard family perennial that typically grows in a spreading basal mound to 30-36” tall and to 24-30” wide. These cuttings were taken from our best seakale plants that we propagated by seed. 2 Sea Kale root cuttings. Each root cutting is 4 inches long and 1/4-1/2 inch in diameter.