Protecting kale from winter cold ensures your plants survive freezing temperatures and continue producing fresh, nutritious leaves throughout the colder months. Kale is a hardy vegetable that can tolerate frost, but extreme cold or prolonged exposure to freezing conditions can damage the leaves and stunt growth. By taking a few simple steps, you can shield your kale from harsh winter weather and even improve its flavor, as cold exposure can increase its sweetness.
What You’ll Need
- Frost cloths, row covers, or garden fabric
- Mulch materials such as straw, shredded leaves, or wood chips
- Cold frames, cloches, or plastic tunnels (optional)
- Garden stakes or hoops for supporting covers
- Watering can or hose
- Pruning shears (for trimming damaged leaves)
Step-by-Step
- Choose a sheltered planting location: Plant kale in an area protected from harsh winds, such as near a south-facing wall or fence. This natural barrier reduces wind chill and helps retain heat.
- Apply a thick layer of mulch: Spread 2-4 inches of organic mulch like straw, shredded leaves, or wood chips around the base of the plants. Mulch insulates the soil, preventing root freeze and moderating temperature fluctuations.
- Water the kale before cold snaps: Moist soil retains heat better than dry soil. Water your kale thoroughly a day or two before expected frost to help protect roots and leaves.
- Use frost cloths or row covers: Drape frost cloths, garden fabric, or row covers over the plants when frost or freezing temperatures are forecast. Secure covers with stakes, rocks, or soil to prevent wind from blowing them away. Ensure covers do not touch the leaves directly to avoid frost damage from contact.
- Set up cold frames or cloches for extra protection: If you live in an area with severe winters, place cold frames or individual cloches over your kale plants. These structures trap heat and shield plants from wind and snow.
- Harvest leaves before extreme cold: Pick mature kale leaves before hard freezes to enjoy fresh produce and reduce the plant’s stress. Kale can tolerate some frost, but prolonged deep freezes can damage the foliage.
- Remove damaged or yellowing leaves: After a cold spell, trim any frost-damaged or yellowing leaves to encourage healthy new growth and prevent disease.
- Monitor and adjust protection: During fluctuating winter temperatures, remove covers during warm days to allow airflow and prevent overheating, then replace them at night.
Common Mistakes
- Not watering before frost: Dry soil offers little insulation and can cause roots to freeze more easily.
- Allowing covers to touch leaves: Direct contact can freeze the leaves where the fabric touches, causing damage.
- Using plastic sheets without ventilation: Plastic can trap moisture and heat, potentially causing fungal diseases or overheating during sunny days.
- Ignoring wind protection: Cold winds increase the risk of frost damage and desiccation of kale leaves.
- Leaving damaged leaves on the plant: Frost-damaged leaves can harbor pests and diseases, harming overall plant health.
Tips
- Choose frost-hardy kale varieties: Varieties like ‘Winterbor’, ‘Red Russian’, or ‘Lacinato’ are more cold-tolerant and better suited for winter growing.
- Layer protection: Combine mulch, windbreaks, and row covers for best results in extreme cold.
- Use hoops to keep fabric off leaves: Construct hoops from wire or plastic tubing to create a mini tunnel that prevents cover contact with leaves.
- Harvest after frost for sweeter leaves: Exposure to cold converts starches to sugars, enhancing kale’s flavor.
- Monitor weather forecasts closely: Being proactive allows you to apply protection before damage occurs.
Troubleshooting
Leaves turning black and mushy after frost: This indicates frost damage. Remove affected leaves promptly to prevent rot spreading. Ensure future protection by using row covers and mulch.
Plants wilting despite protection: Check soil moisture levels; overwatering or poor drainage can cause root rot, especially under covers. Adjust watering and improve drainage if needed.
Frost cloths blowing away: Secure covers with heavy objects, stakes, or bury edges in soil. Using hoops can also stabilize covers.
Yellowing leaves during winter: This can be natural aging or nutrient deficiency. Apply balanced fertilizer in early winter and remove old leaves to promote new growth.
Fungal spots or mold under covers: Increase ventilation by removing covers during warm days and avoid watering foliage in the evening.
Frequently Asked Questions
- Can kale survive a hard freeze?
- Kale is frost-tolerant and can survive hard freezes if protected with mulch and covers. However, prolonged exposure to severe freezing can damage leaves.
- Is it better to harvest kale before or after a frost?
- Harvesting after a light frost often results in sweeter leaves, but before a hard freeze is safer to avoid damage and loss.
- What kind of mulch is best for winter kale?
- Straw, shredded leaves, and wood chips are excellent mulches as they insulate soil and break down slowly without harboring pests.
- Can I grow kale outdoors all winter?
- In many climates, yes. With proper protection like mulching and frost covers, kale can thrive outdoors throughout winter.
- Should I water kale during winter?
- Water kale when the soil is dry but avoid overwatering. Moist soil helps protect roots from freezing, but soggy soil can cause rot.
- Do plastic tunnels harm kale in winter?
- Plastic tunnels can protect kale from extreme cold but must be ventilated on warm days to prevent overheating and fungal problems.
By following these guidelines, you can successfully protect your kale plants from winter cold and enjoy fresh, nutrient-rich greens even in the chilliest months. Winter kale care requires some preparation and attention, but the rewards of homegrown, frost-hardened kale are well worth the effort.
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