annual vegetable
Redbor kale
Redbor kale is an annual vegetable noted for ornamental edible kale and cold sweetened leaves. It grows in USDA zones 3a-10a, prefers full sun, part sun and loam and clay soils, and harvest timing is curly purple leaves in cool weather.
Fit and caveats
Redbor kale is mainly a timing crop. Leafy greens and brassicas are usually best in cool weather, and quality drops when heat, drought, insects, or late harvest push plants past their window.
Best fit
- Spring and fall beds in its listed growing range where cool weather can carry leaf quality.
- Gardeners who can rotate away from other cabbage-family crops and use row cover if flea beetles or caterpillars are regular problems.
- Raised beds or containers with fertile, moisture-retentive soil.
Use caution
- Cabbage-family crops should not follow cabbage, broccoli, kale, mustard, turnip, or radish in the same bed when rotation is possible.
- Small seedlings are vulnerable to flea beetles, slugs, rabbits, and drying soil.
- Waiting too long to harvest often causes more quality loss than pest damage.
Regional notes
- In hot Southern ZIPs, fall, winter, and early spring are often better than late spring for cool-season greens.
- In northern ZIPs, greens are among the best shoulder-season crops and can be succession-planted.
- Where insects are predictable, lightweight row cover at planting is often more effective than reacting after damage.
Comparison note: Compared with tomatoes or cucurbits, Redbor kale is faster and better for shoulder seasons. Compare greens by heat tolerance, days to harvest, pest pressure, and whether you want baby leaves, heads, stems, or cooking greens.
Photos
Photos show a representative plant in the garden. Fruit color, size, and growth habit can vary by cultivar, season, nursery stock, and site.
Photo sources: Frank Vincentz / Wikimedia Commons (CC BY-SA 3.0)
Harvest and uses
- Harvest window
- curly purple leaves in cool weather
- Yield return
- 0.5-1.5 lb/plant/season
- First harvest
- 35-70 days
- Best for
- Vegetables & herbs, Curb appeal & color
- Notable traits
- ornamental edible kale, cold sweetened leaves
Spacing, yield, and timing
How far apart should you plant Redbor kale?
Plant Redbor kale at 0.5-1.5 ft in-row x 1-3 ft rows. Adjust this starting point for trellises, hedges, rootstock, containers, pruning style, or local extension guidance.
How much does Redbor kale produce?
Redbor kale yield is modeled as 0.5-1.5 lb/plant/season. Treat that as a planning range, because weather, soil, watering, pruning, pests, and local pressure can change the real result.
How long does Redbor kale take to produce?
Redbor kale usually reaches first useful harvest or display in 35-70 days under suitable conditions.
How do you grow Redbor kale?
Grow Redbor kale in USDA zones 3a-10a with full, partial light, loam, clay soil, and medium water. Use 0.5-1.5 ft in-row x 1-3 ft rows for layout planning. Match the plant to drainage, heat, chill, and pest pressure before scaling up.
Can Redbor kale grow in a container?
Redbor kale can start with a container of about 5+ gal (workable). Larger containers usually buffer heat and moisture swings better than the minimum.
- 10-year return
- 5-15 lb/10 yrs
- Full output
- This season
- Planting depth
- Set transplants at the same depth as the nursery pot.
- Productive life
- 1 yrs
- Difficulty
- 2/5
- Reliability
- 4/5
- Data quality
- Medium profile, Medium yield confidence
Yield varies most with climate, soil, rootstock, pruning, pest pressure, and wildlife.
Estimated Pound Return
Medium yield confidence- Year 1
- 0.5-1.5 lb First-year estimate from the sourced curve.
- Year 5
- 0.5-1.5 lb
- Year 10
- 0.5-1.5 lb
- 10-year total
- 5-15 lb/10 yrs
Shaded band shows the sourced low-to-high pound-yield range. The line tracks the midpoint for quick comparison.
Method: direct pound yield from crop metric source. Annual crops assume one comparable planting per year; perennial crops ramp from first bearing to full production.
Planting, care, and risk checks
Checklist
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Seed-starting trays
Propagation / Pre-seasonStart annual vegetables, herbs, and flowers ahead of transplant season.
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Floating row cover
Protection / At plantingProtect young crops from wind, light frost, and early pest pressure while still letting light and water through.
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Right-size container with drainage
Containers / Before plantingUse a container large enough for mature roots, with open drainage holes to prevent root rot.
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Insect netting
Protection / At plantingExclude common chewing and flying pests from vulnerable vegetables, herbs, and young fruit plantings.
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Expanding container potting mix
Containers / Before plantingUse a lighter container medium instead of dense garden soil in pots and grow bags.
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Shade cloth
Protection / Heat wavesReduce heat stress for cool-season greens, tender transplants, and containers in hot sun.
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Low tunnel hoops
Protection / At plantingHold frost cloth or insect netting above seedlings so covers protect plants without rubbing leaves.
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Seedling grow light
Propagation / Pre-seasonKeep indoor seedlings compact and sturdy before they move outside.
Planting strategy
- Planting depth: Set transplants at the same depth as the nursery pot.
- Container minimum: 5+ gal (workable). Use 5+ gal for most single vegetable plants; smaller leafy/root crops can use less.
- Start with one plant when testing fit in a new bed or container.
- Plant more than one when harvest volume or pollination is the main goal.
- Pairing map: 7 nearby companion or variety options.
Risk factors
- Deer pressure: Occasionally damaged. Use as a deer browsing cue, not a guarantee; heavy deer pressure can override resistance ratings.
- Black walnut: Mixed or uncertain. Use as a black walnut / juglone planning cue; tolerance varies by cultivar, soil, and distance from the tree.
- Match the site first: full, partial light, loam, clay soil, and medium water.
- Use 0.5-1.5 ft in-row x 1-3 ft rows as the first spacing model; adjust for hedges, trellises, containers, or local guidance.
- Plan around mature size: 0.8-3 ft H x 0.8-2 ft W.
- For harvest planning, treat "curly purple leaves in cool weather" and 0.5-1.5 lb/plant/season as planning ranges, not guarantees.
- Local drainage, pests, chill hours, wildlife pressure, and microclimates can change the result.
Related planning guides
Comparable plants
Companion plants and pairings
Plant Nearby
Small-flowered herbs and annuals near brassicas can support beneficial insects while the brassicas fill out.
Use it: Keep insectary flowers at the sunny edge of the bed so brassicas still get airflow and full leaf expansion.
Sources and methodology
This guide combines hardiness range, light, soil, water, harvest timing, traits, supplier links, plant relationships, and quantitative planning metrics. Pairings are screened for practical garden fit.
Quantitative values use extension and botanical-reference ranges where available. For less-studied cultivars, similar crops fill gaps conservatively. Ranges are intentionally broad so the profile stays useful without pretending to be exact.
Planning sources: UGA Extension - Growing Vegetables OrganicallyCornell Cooperative Extension - Recommended Spacing and Expected Yield for Garden VegetablesUniversity of Maine Extension - Planting Chart for the Home Vegetable GardenUniversity of Maryland Extension - Types of Containers for Growing VegetablesIllinois Extension - Growing Vegetables in Containers
Editorial sources: University of Minnesota Extension: Growing broccoli in home gardensUniversity of Minnesota Extension: Growing collards and kale in home gardensUniversity of Minnesota Extension: Growing cauliflower in home gardensUniversity of Minnesota Extension: Growing turnips and rutabagas in home gardensClemson Cooperative Extension: Chinese Vegetables
Affiliate listing: Amazon. Search links are not paid placements unless explicitly marked; affiliate listings may earn a commission. Last reviewed: 2026-05-31.