How to Grow Kale, Sunburst
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Kale, Sunburst
Brassica oleracea var. acephala
vegetableSunburst kale is a vibrant yellow-green curly kale variety known for its tender, sweet leaves and attractive frilly texture. This cold-hardy brassica is nutrient-dense and becomes sweeter after frost, making it ideal for both raw and cooked preparations. It's a productive, reliable variety that thrives in cool seasons and tolerates light freezes.
When should you plant Kale, Sunburst in your zone?
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Example Kale, Sunburst timeline · Pittsburgh, PA (Zone 6b)
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Plant Kale, Sunburst
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Kale, Sunburst
Around Jun 11≈ 55 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Kale, Sunburst dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-9; best in cool-season zones 4-8
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Seedling
10-14 daysSmall cotyledons emerge, followed by first true leaves. Plant is fragile and low to ground.
Keep soil consistently moist. Provide bright light (indoors or in shade cloth outdoors). Thin seedlings to prevent crowding.
Vegetative/Leaf Development
20-35 daysPlant develops multiple frilly leaves and establishes a strong root system. Stem begins to elongate.
Maintain consistent watering and fertilize every 2-3 weeks with balanced or nitrogen-heavy fertilizer. Remove lower damaged leaves. Monitor for pests.
Mid-Growth/Establishment
15-20 daysPlant reaches 12-18 inches tall with dense crown of curly yellow-green foliage. Leaves become more substantial and tender.
Continue regular watering and feeding. Mulch around base to retain moisture and regulate soil temperature. Support with light staking if needed in windy areas.
Mature/Harvest-Ready
Ongoing through seasonPlant reaches full size (18-24 inches) with abundant harvestable leaves. Sweetness increases after light frost.
Begin harvesting outer leaves. Reduce nitrogen to avoid excess lushness. Continue consistent watering. Cold exposure improves flavor.
Extended Harvest
8-12+ weeks depending on seasonPlant continues producing new leaves as outer leaves are removed. In cool climates, productivity extends into winter.
Regular harvesting encourages new growth. Protect from severe freezes with row covers. Fertilize lightly monthly to sustain production.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Floating row covers, Bt (Bacillus thuringiensis), hand-picking, neem oil
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Row covers, neem oil, spinosad, diatomaceous earth, reflective mulch
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Bt spray, hand-picking, neem oil, parasitic wasps
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Strong water spray, insecticidal soap, neem oil, beneficial insects
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Yellow sticky traps, neem oil, insecticidal soap, reflective mulch
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Ensure air circulation, remove infected leaves, copper fungicide, avoid overhead watering
Uses
Raw salads and slaws
CulinarySunburst kale's tender texture and naturally sweet flavor make it ideal for fresh salads, slaws, and smoothies without the toughness of some kale varieties. [source]
Cooked greens and chips
CulinaryExcellent for sautéing, steaming, or baking into crispy kale chips. Its sweetness intensifies when cooked. [source]
Nutritional superfood
MedicinalKale is extremely nutrient-dense, rich in vitamins A, C, K, calcium, iron, and antioxidants including sulforaphane and lutein, supporting immune and eye health. [source]
Decorative garden edging
HouseholdThe frilly yellow-green leaves make Sunburst kale an attractive ornamental edging plant in vegetable gardens or mixed borders. [source]
Pollinator and beneficial insect support
WildlifeKale flowers (if left to bolt) provide pollen and nectar for bees and beneficial insects that help control garden pests. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting outer leaves when plant is 10-12 inches tall (at 40-50 days). Snap or cut leaves at the stem, working from outside inward. Sweeter after frost. Can harvest continuously through season. Morning harvest yields crispest leaves. Remove yellowed or damaged leaves regularly to maintain plant vigor.
Fun Facts
- 🌱 Sunburst kale's flavor becomes noticeably sweeter after exposure to freezing temperatures due to the conversion of starches to sugars—a natural antifreeze mechanism.
- 🌱 Kale is one of the most nutrient-dense foods per calorie, containing more vitamin C than oranges and more calcium than milk (per serving).
- 🌱 Sunburst is a relatively modern variety developed for superior texture and tenderness compared to traditional kale, making it more palatable for fresh eating.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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