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Companion Planting for Blackberries: Boost Your Garden's Health and Yield

blackberry companion plants

Blackberry Companion Plants: What Are They, and Why Do You Need Them?

If you're planning to grow blackberries in your garden, you might want to consider planting companion plants alongside them. Companion planting is the practice of growing different crops together in order to boost their health and yield while reducing pests and diseases. In the case of blackberries, there are several plant species that can help improve the growth and fruiting of your bushes.

In this article, we'll explore the benefits of companion planting for blackberries and highlight some of the best plant species to grow alongside them. We'll also provide tips on how to care for your blackberry bushes and maintain a healthy garden environment.

The Benefits of Companion Planting for Blackberries

Companion planting can offer several advantages to blackberry growers. Here are some of the main benefits:

Improved Soil Health

Growing different plant species together can help improve soil fertility and structure. For example, legumes such as clover and beans can fix nitrogen in the soil, which blackberries need for healthy growth. Similarly, plants with deep roots like comfrey and yarrow can help break up compacted soil and bring nutrients closer to the surface.

Natural Pest Control

Certain plants can help repel or confuse pests that may attack blackberries. For instance, marigolds and nasturtiums emit strong odors that deter aphids, whiteflies, and other insects. On the other hand, herbs like thyme and basil can attract predatory insects such as ladybugs and lacewings, which feed on pests like aphids and spider mites.

Disease Prevention

Planting certain species alongside blackberries can help reduce the risk of common diseases such as powdery mildew and botrytis. For example, chives and garlic contain natural antifungal compounds that can inhibit the growth of these pathogens. Additionally, plants with high levels of antioxidants like sage and oregano can help boost the immune system of blackberry plants.

Best Companion Plants for Blackberries

Now that you know why companion planting is beneficial for blackberries, let's take a look at some of the best plant species to grow alongside them:


Clover is a legume that can fix nitrogen in the soil and attract beneficial insects like bees and butterflies. It also helps suppress weeds and prevent erosion. Plant clover seeds around your blackberry bushes in early spring or fall.


Nasturtiums are annual flowers that have bright orange or yellow blooms. They emit a strong odor that repels aphids and other pests, making them an effective natural pest control measure. Nasturtiums also add color to your garden and are edible – you can use their leaves and flowers in salads and other dishes.


Comfrey is a perennial herb that has deep roots and can bring up nutrients from the subsoil. It also contains high levels of potassium, which blackberries need for fruit development. Comfrey leaves can be used as a mulch or compost ingredient, or added to homemade fertilizers.


Borage is an annual herb that attracts bees and other pollinators with its blue star-shaped flowers. It also has a deep taproot that can break up compacted soil and improve drainage. Borage leaves and flowers are edible and have a cucumber-like flavor.


Garlic is a bulb crop that has natural antifungal properties. Plant garlic cloves around your blackberry bushes in fall or early spring to help prevent diseases like botrytis and powdery mildew. Garlic also repels some pests like aphids and slugs.

Caring for Blackberry Plants and Companion Species

To ensure the health and productivity of your blackberry bushes and companion plants, it's important to follow these tips:


Blackberries need regular watering, especially during hot and dry spells. Aim to provide at least 1 inch of water per week, either through rainfall or irrigation. Companion plants may have different water requirements, so make sure to research their needs and adjust accordingly.


Blackberries benefit from regular fertilization with nitrogen-rich sources such as compost, manure, or blood meal. However, avoid over-fertilizing or using synthetic fertilizers, which can burn the roots and damage the soil ecosystem. Companion plants may have different nutrient needs, so choose fertilizers that suit their requirements.


Blackberry bushes need annual pruning to remove old canes and promote new growth. This also helps prevent disease buildup and improves air circulation. Companion plants may not require pruning, but you should still monitor their growth and remove any dead or damaged foliage.

Pest and Disease Control

Keep an eye out for common pests and diseases that can affect blackberries and companion plants. Early detection and prevention are key to minimizing damage and reducing the need for chemical treatments. Use natural remedies such as insecticidal soap, neem oil, or homemade sprays made from garlic, chili peppers, or other ingredients.

Frequently Asked Questions

1. Can I plant blackberries and raspberries together?

Yes, blackberries and raspberries can be grown together as companion plants. They have similar soil and sun requirements and can benefit from each other's presence.

2. How far apart should I plant blackberry bushes?

Blackberry bushes should be spaced at least 3-4 feet apart to allow for adequate air circulation and sunlight. This also makes it easier to prune and harvest the fruit.

3. What is the best time to plant blackberry companion plants?

The best time to plant blackberry companion plants depends on their specific needs and your climate zone. Generally, spring and fall are good times to plant most species, but you should research each plant's growth habits and frost tolerance before planting.

4. Can I use synthetic fertilizers on my blackberry bushes?

While synthetic fertilizers can provide quick nutrients to plants, they can also harm soil health and beneficial organisms. It's better to use organic or natural fertilizers such as compost, manure, or bone meal, which feed the soil ecosystem and promote long-term growth.

5. Do I need to mulch around my blackberry bushes?

Mulching can help retain moisture in the soil, suppress weeds, and regulate soil temperature. Organic materials such as straw, leaves, or wood chips can make excellent mulches for blackberry bushes and companion plants. Just make sure to avoid piling up mulch against the base of the plants, as this can attract pests and cause rotting.

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