Brassica oleracea (Acephala Group) 'Redbor'
vegetableRedbor is a frilly, intensely curled kale in glowing magenta-to-deep-purple, a hybrid that is as much an ornamental as an edible. It grows upright on sturdy stems to 2 to 3 ft, holding its color all season and deepening to richer purple in cold weather, which also sweetens the leaves. Fully edible, the tender curly leaves are used like any kale - in salads, chips, soups, and sautées - while the plant itself makes a dramatic centerpiece in beds, borders, and large containers. Cold hardy and productive, it keeps cropping into winter and shrugs off light snow.
Sun
full sun
Water
Every 3 days
Harvest
~55 days
Difficulty
easy
Lifecycle
biennial
Leaves year 1, flowers year 2
Spacing
18-24 in. apart
Planting Depth
Seed 1/2 in.; transplant up to the first leaves
Soil pH
6.0-7.5
Soil Type
Rich, fertile, well-draining
Hardiness Zones
Zones 3 – 9
Grown as an annual — this range is its winter hardiness, but you can grow it for a single season in any zone.
When to Fertilize
Side-dress mid-season
Fertilizer
Balanced with steady nitrogen
Grow Redbor in full sun in rich, fertile, well-drained soil. Start seed indoors about 6 weeks before the last frost or direct-sow, and set transplants 18 to 24 in. apart for full-sized plants. It thrives in cool weather and is excellent for both spring and fall crops; flavor and color are best after frost. Keep evenly moist and side-dress with nitrogen for lush leaf growth, harvesting the lower leaves regularly to keep the plant producing from the top. As a tall kale it benefits from firm planting and occasional staking in windy sites. Net or cover to manage cabbage worms and aphids.
spring planting
Start seeds indoors
Mar 4
Transplant outdoors
Apr 1
Projected first harvest
May 26
fall planting
Start seeds indoors
Jul 21
Transplant outdoors
Aug 25
Projected first harvest
Oct 19
Good neighbors that attract beneficial insects or deter pests
Proactive ways to stop trouble before it starts — tap a name with an arrow for its full guide
Hand-pick the green caterpillars, use insect netting, and apply Bt if needed - the curled leaves can hide them, so check closely
Blast colonies from the frilly leaves with water and encourage ladybugs; the curls give them shelter, so inspect regularly
Cover young plants and keep them vigorous to outgrow the shot-hole damage
Hand-pick the orange-and-black bugs and their egg clusters and remove crop debris where they overwinter
Harvest Redbor leaf by leaf, picking the lower, outer leaves once they reach usable size and leaving the growing crown to keep producing - this cut-and-come-again approach yields for months. The flavor is mildest and sweetest after a frost. Young leaves are tender enough for raw salads; larger leaves are best massaged for salads or cooked into chips, soups, and sautées. Strip the leaf from the tough central rib before using. It holds in the garden into winter, so pick as needed.
Kale is a nutritional powerhouse, exceptionally high in vitamins A, C, and K, plus calcium, fiber, and antioxidants, and Redbor adds the purple anthocyanin pigments on top of kale's usual benefits. The frilly leaves work raw in salads (massaged to tenderize), baked into chips, or cooked in soups and sautées, and because the plant is also so ornamental it earns its place in both the vegetable garden and the flower border.
For educational and informational purposes only — HomeSown is not medical, health, or other professional advice. Always positively identify any plant before handling or eating it; some plants, and some parts of otherwise-edible plants, are toxic. Consult a qualified professional before consuming or otherwise using any plant, especially if you are pregnant, nursing, taking medication, or have a health condition.
spring planting
fall planting