How to Grow Collard Greens

Collard greens are an excellent addition to your garden, providing a nutritious and delicious vegetable to enjoy throughout the year.

How to Grow Collard Greens
Growing Collard Greens - Photo by naturalflow CC BY-SA 2.0

To start, sow seeds 1/4 to 1/2 inch deep, spacing them 18 to 24 inches apart in your garden.

In USDA hardiness zones 8 and higher, planting collard greens in the fall and harvesting throughout the winter will yield the tastiest crop.

Remember that collards prefer cooler growing temperatures, with the optimum range being 60-70°F (16-21°C).

About Collard Greens

Collard greens belong to the Brassica oleracea species, part of the Brassicaceae family.

Originating from the Mediterranean region, this nutritious plant is closely related to kale and other leafy greens.

As a cool weather crop, collard greens thrive in full sun, with a preference for rich, nitrogen-rich soil with a pH of 6.5 to 6.8.

Typically reaching 20-36 inches, these plants are hardy in zones 8-10, making them perennials in warmer regions and annuals in cooler zones.

Growing Collard Greens


You can begin growing collard greens by starting from seeds or nursery transplants.

If starting from seeds, sow them indoors 6-8 weeks before your desired transplanting date. The ideal germination temperature is around 70°F (21°C).

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Transplant seedlings or nursery plants outdoors in early spring or late summer. Collards are a versatile crop that can tolerate a wide range of climates.

Look for a sunny area in your garden that receives at least 6 hours of full sunlight daily.

Ensure the soil is well-drained and has a pH level between slightly acidic to neutral.


When planting collard greens, create rows at least 3 feet (1 m) apart, as they need ample room to expand.

Thin out seedlings to provide 18 inches (46 cm) of space between each plant.

Remember, you can use the thinned seedlings in salads or coleslaw as a delicious and nutritious dish addition.

Caring For Collard Greens
Caring For Collard Greens

Caring For Collard Greens

Sun and Temperature

Collard greens (Brassica oleracea) thrive in full sun to partial shade, requiring at least four to five hours of sunlight daily.

They are cool-weather crops, so plant them outdoors during early spring or fall when temperatures are moderate.

Water and Humidity

Keep the soil consistently moist but not waterlogged for optimal growth.

Water the plants evenly, ensuring they receive about 1 inch per week through rainfall or supplemental watering.


Collard greens grow best in fertile, well-drained soil with a pH between 6.0 and 7.0.

Enhance your soil by incorporating organic matter like compost or aged manure for optimum nutrient availability.


Apply nitrogen-rich fertilizer to support the rapid growth of collard greens.

Use a balanced, slow-release fertilizer following the manufacturer's instructions for application rates and frequency.

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When growing collard greens in containers, choose a pot 12 inches deep with proper drainage.

Repot the plant as needed to provide adequate space for root growth and ensure continued development.

Pruning and Propagation

Regularly harvest the leaves by cutting away the outer, lower leaves. This encourages new growth and prevents the plant from becoming too crowded.

To propagate collard greens, sow seeds directly in the prepared garden bed, thinning seedlings 18 inches apart for ample growth room.

Troubleshooting Plant Problems

Growing Problems

If your collard green seedlings are stretched and spindly with low yields, it may signify inadequate light levels.

Ensure you provide sufficient light exposure and proper placement for better growth.

When transplanting collard greens, avoid planting them too close together or in late summer, as they may produce a bitter taste or bolt.

Pests and Diseases

Collard greens, being part of the cabbage family, can experience issues with pests like aphids, cabbage loopers, and cabbage worms.

Diseases such as black rot and clubroot may also affect the plants.

To manage these issues, monitor your plants regularly, remove damaged leaves, and use organic insecticides or biological controls when necessary.

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Companion Planting

Companion planting can help grow healthier collard greens by providing natural pest control and improving soil nutrition.

Some suitable companion plants include annuals and biennials like onions, garlic, and nasturtiums, which can deter pests and enhance the overall health of your collard greens.

On the other hand, avoid planting collards near other cabbage family plants, as this may attract more pests and cause problems with maturity or loose head development.


Collard greens are a flavorful addition to your meals and a highly nutritious choice, providing calcium, fiber, and iron to your diet.

To successfully grow and harvest them, start by planting seeds outdoors about two weeks before your last spring frost date or by sowing seeds indoors around four to six weeks earlier.

Remember to plant your collard greens in fertile, well-drained, slightly acidic soil, and space your plants appropriately for proper growth.

Harvest the young leaves for a tender, tasty addition to salads, coleslaw, and other dishes.

By following these guidelines, you can enjoy the benefits of homegrown collard greens and elevate your harvest with minimal effort and clear, expert guidance.

Frequently Asked Questions

What is the ideal temperature for growing collard greens?

Collard greens prefer cooler growing temperatures, between 55-75°F (13-24°C). The optimum temperature range is 60-70°F (16-21°C).

How can I ensure a continuous harvest from collard greens?

Plant new seeds every 2-3 weeks throughout the growing season to ensure a continuous harvest.

This will provide you with a steady supply of collard greens for harvesting.

What is the best time to plant collard greens for a fall harvest?

For a fall harvest, plant collard greens about 6-8 weeks before the first expected frost in your area.

This will give your plants enough time to mature before the cold weather sets in.

Can you grow collard greens from a leaf?

Growing collard greens from a leaf is not a reliable method. Using seeds or seedlings to ensure healthy and consistent growth is best.

How deep should collard greens be planted?

Plant collard green seeds about 1/4 to 1/2 inch deep in the soil. When transplanting seedlings, place them 12-18 inches apart in rows 18-36 inches apart.

How long does it typically take for collard greens to mature?

Collard greens typically take 60-75 days to mature from the time of planting.

Some varieties may take slightly longer, so check the specific seed package for growing time information.