How to Grow Kale

Kale

Brassica oleracea var. acephala

vegetable

Kale is a hardy, nutrient-dense leafy green belonging to the cabbage family, known for its deeply textured, curly or flat leaves. It thrives in cool weather and actually becomes sweeter after frost. This cold-tolerant crop is one of the most nutritious vegetables available, packed with vitamins, minerals, and antioxidants.

Looking for a specific variety?

Curly Kale Lacinato Red Russian Winterbor Sunburst Scarlet

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade in hot climates

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Water: Consistent moisture, 1-1.5 inches per week; keep soil evenly moist but not waterlogged; more critical during growth phase

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Spacing: 12-18 inches apart for mature plants; thin seedlings to 6 inches initially, then thin to final spacing inches

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Days to maturity: 50-90 days depending on variety and weather; spring crops take longer, fall crops faster

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Planting depth: Seeds planted 0.5 inches deep; transplants planted at same depth as container

Soil

Type: Well-draining, fertile loamy soil rich in organic matter

pH: 6.0-7.5

Amendments:

Compost (2-3 inches worked in) Aged manure Peat moss or coconut coir Balanced fertilizer (10-10-10)

Growing Zones

Find your zone →

Thrives in zones 2-9; particularly excellent in zones 4-8 for both spring and fall crops

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a

Growth Stages

Seedling

2-3 weeks

Small plants with 2-4 true leaves emerging; delicate appearance with tender stems

Keep soil consistently moist; provide bright light if indoors; thin to strongest plants; maintain 60-70°F if possible

Vegetative Growth

4-8 weeks

Rapid expansion of leaf structure; plant develops multiple stems with increasingly large, textured leaves

Water consistently; apply balanced fertilizer every 3-4 weeks; mulch to retain moisture and regulate soil temperature; monitor for pests

Leaf Production

4-12 weeks (extends with continued harvest)

Plant reaches mature size with full, lush foliage; outer leaves fully developed and harvestable

Begin harvesting outer leaves when 8-12 inches tall; continue fertilizing; water deeply during dry spells; kale becomes sweeter after light frost

Peak Harvest

6-12 weeks

Plant maintains full productivity with continuous new leaf development from center crown

Harvest regularly to encourage more leaf production; cut outer leaves 2-3 inches from base; remove any yellowing or damaged leaves; continue watering and fertilizing

Flowering & Decline

Variable; signals end of prime harvest season

Plant bolts when temperatures warm or day length increases; small yellow flowers appear on flower stalks

In spring crops, expect bolting by late spring/early summer; pull plants and replant fall crop; fall-grown kale rarely bolts before winter; young flower shoots are edible

Companion Planting

Plan your garden →

Plant with:

Onions Garlic Beets Potatoes Herbs (thyme, dill, chamomile) Beans Nasturtiums Borage

Avoid planting near:

Tomatoes Peppers Fennel Kohlrabi Cabbage (same family, compete for nutrients) Broccoli Cauliflower

Common Pests

Row covers over young plants; handpick caterpillars; neem oil spray; encourage parasitic wasps
Bacillus thuringiensis (Bt); handpick; neem oil; remove weeds that harbor moths
Row covers; diatomaceous earth; neem oil; kaolin clay spray on young plants
Strong water spray to dislodge; insecticidal soap; neem oil; encourage natural predators like ladybugs
Yellow sticky traps; insecticidal soap; neem oil; ensure good air circulation
Improve soil drainage; avoid planting brassicas in same location for 3-4 years; use resistant varieties; lime acidic soils

Uses

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Nutritious Fresh Cooking & Salads

Culinary

Raw kale can be torn or chopped into salads, smoothies, and grain bowls; massage with oil and salt to soften texture. Tender younger leaves are less bitter and ideal for raw preparations. [source]

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Cooked Greens & Soups

Culinary

Sauté, steam, or braise kale as a side dish; add to soups, stews, and curries where it maintains structure when cooked. Older leaves become tender when cooked and lose some bitterness. [source]

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High Nutrient Content & Phytonutrients

Medicinal

Kale is exceptionally rich in vitamins K, C, and A, plus minerals like calcium and iron. Contains powerful phytonutrients and antioxidants including glucosinolates that support health. [source]

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Chips & Crispy Snacks

Culinary

Toss kale leaves with oil, salt, and seasonings, then bake at low temperature to create crunchy kale chips. A popular healthy snack alternative to traditional chips. [source]

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Natural Dye Source

Household

Kale leaves can be used to create natural yellow and green dyes for fabrics and crafts. The pigments provide consistent color results. [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 when plant reaches 8-12 inches tall by picking outer leaves first, working toward the center; leaves harvest best in morning after dew dries; never remove more than 25% of plant at once to maintain vigor; outer, darker leaves are more nutritious than inner leaves; kale sweetens after light frost (28-32°F); can be harvested until hard freeze (-15°F or below); remove flowering stalks for continued leaf production

Fun Facts

🌱 Kale's nutritional value actually increases after frost due to the plant converting starches to sugars as a freeze-protection mechanism, making fall-harvested kale sweeter and more flavorful than spring-harvested plants.
🌱 A single kale plant can produce leaves for 4-6 months or longer with proper harvesting, making it one of the most productive vegetables per plant in terms of yield duration.
🌱 Kale has been cultivated since at least 2000 BCE and was a staple food in medieval Europe, with different varieties developing regionally—curly kale didn't become common until the 1600s.

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