Growing Sea Kale Made Easy: Tips for a Bountiful Harvest

Sea kale
Sea kale - Photo by Malene Thyssen

What is Sea Kale? A Brief Introduction

Sea kale (Crambe maritima) is a unique and delicious vegetable that has been gaining popularity in recent years. It is a member of the brassica family, which includes other familiar vegetables like broccoli, cabbage, and cauliflower. It is native to the coasts of Europe, where it grows in rocky, salty soil. The plant itself is hardy and perennial, meaning it will come back year after year.

One of the most distinctive features of sea kale is its large, waxy leaves, which can grow up to 12 inches (30 cm) long and 6 inches (15 cm) wide. The leaves have a bluish-green color and a slightly salty flavor, reflecting the plant’s coastal origins. The plant also produces clusters of small, white flowers in the late spring or early summer, which are attractive to pollinators like bees and butterflies.

Sea kale has a long and fascinating history. It has been used as a food source in Europe for centuries, and was once considered a delicacy among the upper classes. In fact, the plant’s scientific name, Crambe maritima, comes from the Greek word “crambe,” which means “a heap of food.” Sea kale was also used medicinally in the past, as it was believed to have diuretic and laxative properties.

Today, sea kale is prized for its unique flavor, as well as its nutritional content. The leaves are high in vitamins A and C, as well as minerals like calcium and potassium. Sea kale is also a good source of dietary fiber, making it a healthy addition to any diet.

If you’re interested in growing sea kale in your own garden, there are a few things you should know. The plant prefers well-drained soil and plenty of sunlight, but can tolerate some shade. It is also quite hardy and can survive temperatures as low as 0°F (-18°C). With a little bit of care and attention, you can enjoy a bountiful harvest of this delicious and nutritious vegetable

Why Grow Sea Kale in Your Garden?

Sea kale is a nutrient-dense, low-maintenance perennial vegetable that is gaining popularity among gardeners. Here are a few reasons why you might want to consider growing sea kale in your garden:

  1. Nutritional benefits: Sea kale is a rich source of vitamins and minerals, including vitamin C, potassium, and calcium. It also contains antioxidants and has been shown to have anti-inflammatory properties.
  2. Easy to grow: It is a hardy plant that is well-suited for a range of growing conditions. It is tolerant of salt and wind, making it ideal for coastal gardens, and it can also be grown inland.
  3. Low-maintenance: Once established, it requires minimal care. It is drought-tolerant and resistant to most pests and diseases.
  4. Ornamental value: In addition to its culinary uses, sea kale also has attractive foliage that can add interest to your garden. The leaves are a pale blue-green color and have a distinctive wavy texture.
  5. Sustainable choice: Sea kale is a sustainable alternative to many other vegetables, as it requires minimal resources to grow and is not typically subject to intensive farming practices.

By adding sea kale to your garden, you can enjoy a unique and nutrient-rich vegetable that is easy to grow and maintain.

Choosing the Right Location

When it comes to growing sea kale, choosing the right location is key to its success. Sea kale thrives in full sun to partial shade, so it’s important to select a spot that receives at least 6 hours of sunlight per day. If you live in a hot climate, it’s best to provide some shade during the hottest part of the day.

Sea kale prefers well-draining soil that is rich in organic matter. Before planting, you can improve the soil by adding compost or well-rotted manure. It’s important to make sure that the soil pH is between 6.0 and 7.5, as sea kale prefers slightly acidic to neutral soil.

If you’re growing sea kale in a container, make sure to select a large enough pot to accommodate its deep taproot system. A pot with a depth of at least 12 inches (30 cm) is recommended.

Another important consideration is wind exposure. Sea kale is a hardy plant that can withstand some wind, but it’s best to select a location that provides some protection from strong winds. In addition, it is tolerant of salt spray, so it can be a good choice for coastal gardens.

Finally, consider the proximity of other plants in your garden. Sea kale can grow quite large, up to 3 feet (91 cm) tall and wide, so make sure to give it enough space to grow without overcrowding other plants.

By selecting a sunny, well-draining spot with slightly acidic soil, protecting it from strong winds, and giving it enough space to grow, you can create the perfect environment for sea kale to thrive in your garden.

How to Prepare Soil for Sea Kale Planting

Sea kale is a hardy plant that can grow in a variety of soils, but it thrives in well-draining, fertile soil. Before planting, it’s important to prepare the soil to provide the best growing conditions.

Start by removing any weeds or debris from the planting area. This can be done by hand or with a hoe or rake. Then, dig a hole about 12 inches (30 cm) deep and 12 inches (30 cm) wide for each plant. If you’re planting multiple plants, space them about 24-36 inches (60-90 cm) apart.

Next, amend the soil with compost or well-rotted manure. Add about 2-4 inches (5-10 cm) of compost or manure to the soil and mix it in well. This will help to improve soil structure, increase nutrient levels, and retain moisture.

If your soil is heavy or clay-like, add some sand or perlite to improve drainage. Aim to have a soil pH between 6.0 and 7.0, as sea kale prefers a slightly acidic to neutral soil. A soil test can help you determine the pH level of your soil and any additional amendments that may be needed.

After amending the soil, level the planting area and water thoroughly. Allow the soil to settle for a few days before planting.

In summary, preparing the soil for your sea kale planting involves removing weeds and debris, digging planting holes, amending the soil with compost or well-rotted manure, adding sand or perlite for improved drainage, testing and adjusting soil pH as needed, and allowing the soil to settle before planting. With proper soil preparation, it is sure to thrive and produce delicious and nutritious edible shoots.

Planting: Seeds vs. Cuttings

Planting sea kale can be done either from seeds or cuttings. Both methods have their pros and cons, so it’s important to consider which option is best for your garden.

Starting with seeds can be more cost-effective, but it can also be more time-consuming and require more attention. Seeds are relatively easy to grow, but they have a low germination rate, so you may need to sow more seeds than you actually need to ensure a successful harvest.

If you decide to plant sea kale from seeds, it’s important to start them indoors in late winter or early spring, about 6-8 weeks before the last frost date in your area. Sow the seeds about 1/2 inch (1.3 cm) deep in trays or small pots filled with a well-draining seed-starting mix. Keep the soil moist, but not waterlogged, and place the containers in a warm, bright location.

Once the seedlings have emerged and grown to about 2 inches (5 cm) tall, you can transplant them into larger pots or directly into your garden. When transplanting, make sure to space the plants at least 18 inches (45 cm) apart to give them enough room to grow.

On the other hand, planting sea kale from cuttings can be a quicker and easier option. Cuttings can be taken from established plants in the fall or early spring, and they will produce a crop in the same year. However, cuttings can be more expensive to purchase than seeds.

To plant the cuttings, first prepare the soil by adding compost or aged manure to improve its fertility and drainage. Then, dig holes that are about 6 inches (15 cm) deep and wide enough to accommodate the root system of the cutting. Place the cuttings into the holes, making sure to cover the roots with soil.

Whether you choose to plant sea kale from seeds or cuttings, make sure to water them regularly and keep the soil moist, but not waterlogged. Mulching around the plants can help retain moisture and prevent weed growth. With proper care, sea kale can be a rewarding addition to your garden, providing you with a delicious and nutritious crop for years to come.

Sea Kale Care: Watering, Fertilizing, and Pruning

Sea kale is a relatively low-maintenance plant, but it still requires proper care in terms of watering, fertilizing, and pruning to ensure healthy growth and a bountiful harvest.

Watering: Sea kale prefers consistent moisture levels, so it’s important to water regularly during the growing season, especially during periods of drought. However, be careful not to overwater, as this can lead to root rot. As a general rule, aim to provide about 1 inch (2.5 cm) of water per week, either through rainfall or irrigation.

Fertilizing: It benefits from regular applications of a balanced fertilizer, such as a 10-10-10 or 20-20-20 blend, throughout the growing season. Apply the fertilizer according to the manufacturer’s instructions, usually once a month from spring to mid-summer.

Pruning: Pruning is important to encourage bushier growth and prevent the plant from becoming too leggy. After harvesting the shoots in the spring, cut back the remaining stems to about 6 inches (15 cm) above the ground. This will promote the growth of new shoots for the following year’s harvest.

Additionally, it’s important to remove any dead or diseased foliage as soon as possible to prevent the spread of disease. Keep the area around the sea kale clear of weeds, which can compete for nutrients and water. Finally, be on the lookout for pests such as aphids and caterpillars, and take appropriate measures to control them if necessary.

Companion Planting with Sea Kale

Companion planting is the practice of planting different crops near each other in order to provide mutual benefits such as improved soil health, pest control, and higher yields. Sea kale is a great candidate for companion planting because it is a hardy plant that can thrive in a variety of conditions. Here are some companion plants that work well:

  • Beets: Sea kale and beets both have similar soil requirements and grow well together. The deep taproots of beets can also help to improve soil structure, which benefits sea kale.
  • Beans: Beans are nitrogen-fixing plants, which means they convert atmospheric nitrogen into a form that plants can use. Sea kale benefits from the extra nitrogen that beans provide, which can result in better growth and higher yields.
  • Carrots: Carrots and sea kale are also good companion plants because they have similar soil requirements. Carrots are also known for their ability to attract beneficial insects, which can help control pests that may damage sea kale.
  • Nasturtiums: Nasturtiums are a great companion plant for sea kale because they attract beneficial insects and repel pests such as aphids and whiteflies. They also add a splash of color to your garden.

When companion planting, it’s important to consider the spacing between plants. Sea kale should be planted at least 12 inches (30 cm) apart from other plants to allow for adequate air flow and to prevent competition for nutrients and water. It’s also important to avoid planting near members of the cabbage family, such as chard, as they can attract pests that may also harm sea kale.

In conclusion, companion planting can be a great way to improve the health and productivity of your sea kale plants. By planting with compatible crops, you can create a diverse and thriving garden ecosystem.

Common Pests and Diseases to Watch Out for

While sea kale is generally a hardy plant that can withstand many environmental stressors, it is still vulnerable to certain pests and diseases. Here are some of the most common ones to watch out for:

  1. Aphids: These small insects can quickly colonize the leaves and stems of sea kale and suck out its sap, leading to stunted growth and deformities. Regularly inspect your plants for signs of aphid infestation, such as sticky residue on the leaves or a buildup of black sooty mold. You can try spraying the affected areas with a solution of water and dish soap, or introducing natural predators like ladybugs or lacewings.
  2. Slugs and snails: These mollusks love to feast on young plants, leaving behind jagged holes and slime trails. To prevent slug and snail damage, consider placing copper tape or diatomaceous earth around the base of your plants, or setting up beer traps to lure them away.
  3. White rust: This fungal disease can cause yellow spots and blisters to form on the leaves of sea kale, eventually leading to their decay and death. To prevent the spread of white rust, avoid watering your plants from above and instead use a drip irrigation system. You can also apply a fungicide spray to the affected areas.
  4. Clubroot: This soil-borne disease can cause the roots to become swollen and distorted, leading to poor growth and yield. To prevent clubroot, avoid planting sea kale in soil that has previously grown members of the brassica family (like broccoli or cauliflower), and instead rotate your crops annually. You can also try amending your soil with lime to raise its pH level.

By keeping an eye out for these common pests and diseases, you can help ensure the health and vitality of your sea kale plants. Remember to take preventative measures, like rotating your crops and using natural predators, to minimize the risk of infestation or infection.

Harvesting: When and How to Do It

Sea kale can be harvested once the plant is mature enough, which typically takes 2-3 years after planting. It’s important to wait until the plant is established before harvesting to ensure that it continues to grow and produce for years to come. The best time to harvest sea kale is in the early spring, just as the first shoots begin to appear.

To harvest, use a sharp knife or garden shears to cut the shoots just above the soil line. Be sure to leave at least 2-3 shoots per plant to allow for continued growth and production. Harvesting the shoots encourages the plant to produce more shoots, so you can continue to harvest throughout the spring season.

It’s important to note that while sea kale can be harvested in subsequent years, the yield may decrease over time. For this reason, it’s recommended to allow some plants to reach maturity while leaving others to produce new shoots each year. This will ensure a consistent yield for years to come.

When harvesting, it’s important to handle the shoots with care as they can be fragile. Once harvested, store the shoots in the refrigerator in a plastic bag for up to 5 days. Alternatively, you can blanch the shoots in boiling water for 1-2 minutes and then freeze them for later use.

In summary, harvesting sea kale is best done in the early spring when the shoots first appear. Use a sharp knife or garden shears to cut the shoots just above the soil line and leave at least 2-3 shoots per plant. Be sure to handle the shoots with care and store them in the refrigerator or freeze them for later use. By harvesting sea kale properly, you can enjoy its delicious and nutritious shoots for years to come.

Cooking with Sea Kale: Delicious and Healthy Recipe Ideas

Sea kale is a versatile and nutritious vegetable that can be used in a variety of recipes. It has a mild, sweet flavor that pairs well with a range of other ingredients, making it a great addition to salads, soups, and stir-fries. Here are some delicious and healthy recipe ideas to try:

Sea Kale Salad with Feta and Walnuts


  • 1 bunch sea kale, washed and chopped
  • 1/2 cup crumbled feta cheese
  • 1/2 cup chopped walnuts
  • 1/4 cup olive oil
  • 2 tablespoons lemon juice
  • 1 clove garlic, minced
  • Salt and pepper, to taste


  1. In a large bowl, combine the sea kale, feta cheese, and walnuts.
  2. In a small bowl, whisk together the olive oil, lemon juice, garlic, salt, and pepper.
  3. Pour the dressing over the salad and toss to coat.
  4. Serve immediately.

Sea Kale and Mushroom Stir-Fry


  • 1 bunch sea kale, washed and chopped
  • 1 cup sliced mushrooms
  • 1/2 cup sliced red bell pepper
  • 2 cloves garlic, minced
  • 2 tablespoons soy sauce
  • 1 tablespoon honey
  • 1 tablespoon cornstarch
  • 1/4 cup vegetable broth
  • 1 tablespoon sesame oil
  • Cooked rice, for serving


  1. In a large skillet, heat the sesame oil over medium-high heat.
  2. Add the sea kale, mushrooms, red bell pepper, and garlic to the skillet and stir-fry for 3-4 minutes, until the vegetables are tender.
  3. In a small bowl, whisk together the soy sauce, honey, cornstarch, and vegetable broth.
  4. Pour the sauce over the vegetables and stir-fry for an additional 2-3 minutes, until the sauce thickens.
  5. Serve the stir-fry over cooked rice.

Sea Kale and Potato Soup


  • 1 bunch sea kale, washed and chopped
  • 1 pound potatoes, peeled and chopped
  • 1 onion, chopped
  • 2 cloves garlic, minced
  • 4 cups vegetable broth
  • 1 cup milk or cream
  • Salt and pepper, to taste


  1. In a large pot, combine the sea kale, potatoes, onion, garlic, and vegetable broth.
  2. Bring the mixture to a boil over high heat, then reduce the heat and simmer for 20-25 minutes, until the vegetables are tender.
  3. Use an immersion blender to blend the soup until smooth.
  4. Stir in the milk or cream and season with salt and pepper, to taste.
  5. Serve hot.

These recipes are just a few examples of the many ways you can enjoy sea kale. Experiment with different ingredients and flavors to find your own favorite recipes!

Storing and Preserving Sea Kale for Later Use

Once you have harvested your sea kale, it is important to properly store and preserve it to ensure it stays fresh for as long as possible. Here are some tips on how to store and preserve your sea kale:

  1. Refrigeration: The best way to store sea kale is in the refrigerator. Wrap it in a damp paper towel and place it in a plastic bag. Seal the bag and place it in the vegetable crisper drawer of your refrigerator. It will stay fresh for up to one week.
  2. Freezing: Sea kale can also be frozen for later use. To freeze, blanch it in boiling water for 1-2 minutes, then plunge it into ice water to stop the cooking process. Drain it well, then place it in a freezer bag or container. Label the container with the date and freeze for up to 8 months.
  3. Canning: Canning is another option for preserving sea kale. To can, wash and trim the sea kale, then blanch it in boiling water for 2-3 minutes. Pack it into sterilized jars and cover with boiling water, leaving 1 inch (2.5 cm) of headspace. Process the jars in a pressure canner for 70 minutes for pints and 90 minutes for quarts.
  4. Dehydrating: Sea kale can also be dehydrated for later use. To dehydrate, wash and trim it, then blanch it in boiling water for 1-2 minutes. Drain well, then spread it out in a single layer on dehydrator trays. Dehydrate at 135°F (57°C) for 8-10 hours, or until it is completely dry and brittle.

By properly storing and preserving your sea kale, you can enjoy its delicious flavor and health benefits throughout the year, even when it is out of season.

Be the first to comment

Leave a Reply

Your email address will not be published.