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Lush kale leaves with dew in a garden

Kale

Brassica oleracea var. sabellica

beginner level

A nutritional powerhouse that thrives in cool weather, kale becomes sweeter after frost and can produce for months.

Photo: Unsplash via Unsplash

Quick Growing Facts

Sun Requirements
full sun
Water Needs
moderate
Time to Harvest
50-65 days
Hardiness Zones
2-9
Mature Size
1-2 feet
Soil Type
Rich, well-draining

Soil & Bed Preparation

Incorporate 2 inches of compost and a dusting of kelp meal into the bed. Kale thrives in rich soil with good drainage, so raise beds slightly if rainfall is heavy.

Watering & Feeding

Provide 1 inch of water weekly in spring and increase to 1.5 inches during hot spells. Apply moisture at the soil line to keep leaves as dry as possible.

Side-dress with compost monthly and apply a foliar spray of fish and seaweed after each major harvest to encourage fresh growth.

Training & Maintenance

Harvest lower leaves as they reach 8 inches long, leaving the top crown intact. Remove yellowing leaves promptly to deter pests.

Harvest & Storage

Pick after a light frost for sweeter flavor. Rinse leaves, spin dry, and store in a sealed container with a paper towel for up to a week, or blanch and freeze for soups.

Planting Instructions

  • Start 4-6 weeks before last spring frost
  • Or plant in late summer for fall harvest
  • Space 12-18 inches apart
  • Can tolerate light frosts

Care Instructions

  • Keep soil consistently moist
  • Mulch to keep roots cool
  • Harvest lower leaves first
  • Side-dress with compost monthly

Seasonal Growing Calendar

Early spring

  • Start seedlings indoors 6 weeks before the last frost or direct sow once soil reaches 45 F.
  • Harden off transplants and plant under row cover to protect from flea beetles.
  • Mulch immediately to keep soil cool.

Summer

  • Provide afternoon shade or interplant with taller crops in hot climates.
  • Mist plants during heat waves to cool leaves and reduce stress.
  • Continue harvesting outer leaves to keep plants producing.

Fall

  • Direct sow additional rows 8 weeks before first frost for a late crop.
  • Cover with frost cloth when temperatures drop below 25 F.
  • Mulch heavily to overwinter and resume harvest in early spring.

Companion Plants

Beets
Celery
Onions
Potatoes

These plants grow well together and can provide mutual benefits like pest control, improved soil health, and efficient space usage.

Common Pests & Issues

Cabbage worms
Aphids
Flea beetles

Watch out for these common pests and diseases. Early detection and prevention are key to maintaining healthy plants.

Troubleshooting Guide

IssueHow to fix it
Cabbage worm damageUse floating row cover, hand pick caterpillars, and apply Bt on overcast evenings.
Aphid clusters on new growthBlast with water, release lady beetles, or spray neem oil at dusk.
Leaves turning yellowFeed with a nitrogen-rich amendment such as blood meal and ensure soil moisture is consistent.

Recommended Varieties

Lacinato

Also called dinosaur kale; narrow dark leaves with tender texture.

62 days

Winterbor

Frilly blue-green leaves and excellent cold tolerance for winter harvests.

60 days

Red Russian

Flat, oak leaf kale with red stems and sweet flavor after frost.

50 days

Succession Ideas

  • Start a fall crop in late July to carry you through winter.
  • Interplant kale with garlic or onions to naturally deter pests.
  • Allow one plant to overwinter and collect seed for next season.

🍽️ Culinary Uses

Salads
Smoothies
Chips
Soups

💪 Nutritional Benefits

Vitamin K
Vitamin C
Calcium
Iron
Antioxidants

Ready to Start Growing Kale?

Check out our companion planting guides and learn about creating productive plant guilds for your garden.