Blueberries are a delicious and nutritious fruit, but they require specific growing conditions to thrive. One crucial factor is companion planting—choosing the right plants to grow nearby while avoiding those that can hinder their growth.

Understanding plant compatibility is essential for maximizing blueberry health and yield. Some plants compete for nutrients, alter soil pH, or attract pests that harm blueberries.

By avoiding these problematic neighbors, you can ensure your blueberry bushes remain productive and disease-free.

In this article, we’ll explore the 10 worst plants to grow near blueberries, why they’re harmful, and what alternatives to consider.Let’s dive into the 10 plants you should never grow next to blueberries and why they’re detrimental.

What Not To Plant Next To Blueberries?

1. Tomatoes

Tomatoes are heavy feeders, meaning they consume large amounts of nutrients from the soil. Blueberries, which also require high nutrient levels, can suffer from competition when planted near tomatoes.

 

Additionally, tomatoes prefer slightly alkaline soil, while blueberries thrive in acidic conditions, making them incompatible neighbors.Whether you’re a beginner or an experienced gardener, this guide will help you make informed planting decisions.

Tomatoes are also prone to fungal diseases like verticillium wilt, which can spread to blueberries. The dense foliage of tomato plants can create excessive shade, reducing air circulation around blueberry bushes. This can lead to increased humidity, promoting mold and mildew growth on blueberries.

Instead of tomatoes, consider planting acid-loving companions like azaleas or rhododendrons. These plants share similar soil preferences and won’t compete aggressively for nutrients. Keeping tomatoes far from blueberries ensures both plants grow optimally.

Pros of Avoiding Tomatoes Near Blueberries:
• Prevents nutrient competition
• Reduces disease risk
• Maintains soil acidity
• Avoids shade issues
• Better air circulation
• Healthier blueberries
• Higher fruit yield

Cons of Planting Tomatoes Nearby:
• Nutrient depletion
• Disease spread
• pH imbalance

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2. Potatoes

Potatoes, like tomatoes, are part of the nightshade family and compete with blueberries for soil nutrients. They also prefer neutral to slightly alkaline soil, which can disrupt the acidic conditions blueberries need. Additionally, potatoes attract pests like Colorado potato beetles, which may also damage blueberry plants.

Potatoes are susceptible to blight, a fungal disease that can spread to nearby plants, including blueberries. Their extensive root systems can also interfere with the shallow roots of blueberry bushes, leading to stunted growth. Furthermore, harvesting potatoes requires soil disturbance, which can damage blueberry roots.

Instead of potatoes, opt for companion plants like lingonberries, which thrive in similar acidic soil. This ensures both plants grow harmoniously without competing for resources. Avoiding potatoes near blueberries prevents unnecessary stress on your bushes.

Pros of Avoiding Potatoes Near Blueberries:
• No nutrient competition
• Prevents pest transfer
• Maintains soil pH
• Reduces disease risk
• Protects blueberry roots
• Better plant health
• Higher berry production

Cons of Planting Potatoes Nearby:
• Soil disruption
• Pest attraction
• Root competition

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3. Cabbage

Cabbage and other brassicas (like broccoli and cauliflower) release compounds that can inhibit blueberry growth. They also prefer neutral soil pH, which can reduce soil acidity over time, making it less ideal for blueberries. Additionally, cabbage attracts pests like aphids and cabbage worms, which may spread to blueberries.

Brassicas are heavy feeders, depleting nitrogen and other essential nutrients blueberries need. Their large leaves can also block sunlight, reducing photosynthesis in blueberry bushes. Furthermore, cabbage requires frequent watering, which can lead to overly moist soil—something blueberries dislike.

Instead of cabbage, plant blueberries alongside ferns or evergreen shrubs, which tolerate acidic soil. This ensures both plants thrive without negative interactions. Keeping cabbage away from blueberries prevents unnecessary nutrient and space competition.

Pros of Avoiding Cabbage Near Blueberries:
• No growth inhibitors
• Maintains soil acidity
• Reduces pest risk
• Prevents nutrient loss
• Better sunlight exposure
• Healthier bushes
• More fruit production

Cons of Planting Cabbage Nearby:
• Alters soil pH
• Attracts pests
• Blocks sunlight

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4. Corn

Corn is a tall, fast-growing crop that can overshadow blueberry bushes, limiting their sunlight exposure. It also absorbs large amounts of nitrogen, a crucial nutrient for blueberries, leading to deficiencies. Additionally, corn attracts pests like corn earworms, which may also feed on blueberries.

Corn has deep roots that compete with blueberry roots for water and nutrients. Its dense growth can also reduce air circulation, increasing humidity and disease risk. Furthermore, corn requires frequent fertilization, which can alter soil pH and harm blueberries.

Instead of corn, consider planting low-growing herbs like thyme near blueberries. These herbs don’t compete aggressively and can even repel pests. Avoiding corn ensures blueberries receive adequate sunlight and nutrients.

Pros of Avoiding Corn Near Blueberries:
• Prevents shading
• Reduces nitrogen loss
• Lowers pest risk
• Better air flow
• Maintains soil balance
• Healthier plants
• Higher yields

Cons of Planting Corn Nearby:
• Nutrient competition
• Excessive shade
• Pest attraction

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5. Peppers

Peppers, like tomatoes and potatoes, belong to the nightshade family and have similar negative effects on blueberries. They prefer slightly alkaline soil, which can neutralize the acidic conditions blueberries need. Additionally, peppers attract pests like aphids and spider mites, which may infest blueberry bushes.

Peppers also compete for nutrients, particularly phosphorus and potassium, which are vital for blueberry fruiting. Their bushy growth can create excessive shade, reducing blueberry productivity. Furthermore, peppers are susceptible to fungal diseases that can spread to blueberries.

Instead of peppers, plant blueberries alongside cranberries, which share similar soil preferences. This ensures both plants thrive without competing for resources. Keeping peppers away from blueberries prevents unnecessary stress and disease risks.

Pros of Avoiding Peppers Near Blueberries:
• No pH disruption
• Prevents pest spread
• Reduces competition
• Better nutrient uptake
• More sunlight
• Healthier growth
• Increased fruiting

Cons of Planting Peppers Nearby:
• Alters soil pH
• Attracts pests
• Disease risk

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6. Eggplant

Eggplants, another nightshade plant, compete with blueberries for nutrients and prefer less acidic soil. Their large leaves can block sunlight, reducing blueberry photosynthesis. Additionally, eggplants attract flea beetles and aphids, which may migrate to blueberries.

Eggplants require frequent watering, which can lead to overly moist soil—something blueberries dislike. Their dense foliage can also reduce air circulation, increasing fungal disease risks. Furthermore, eggplants are prone to verticillium wilt, a disease that can spread to blueberries.

Instead of eggplants, plant blueberries alongside heather, which thrives in acidic soil. This ensures both plants grow well without negative interactions. Avoiding eggplants near blueberries prevents unnecessary competition and disease risks.

Pros of Avoiding Eggplant Near Blueberries:
• No nutrient competition
• Maintains soil acidity
• Reduces pest risk
• Better air flow
• Prevents disease spread
• Healthier bushes
• Higher yields

Cons of Planting Eggplant Nearby:
• Attracts pests
• Excessive shade
• Disease transfer

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7. Walnut Trees

Walnut trees release juglone, a toxic compound that inhibits the growth of many plants, including blueberries. This chemical can stunt blueberry bushes and reduce fruit production. Additionally, walnut trees have extensive root systems that compete aggressively for water and nutrients.

The shade from walnut trees can also limit sunlight, reducing blueberry photosynthesis. Their fallen leaves and nuts can further alter soil composition, making it less suitable for blueberries. Furthermore, walnut trees attract squirrels, which may also damage blueberry bushes.

Instead of walnut trees, plant blueberries in open areas or near other acid-loving shrubs. This ensures they receive full sun and avoid juglone toxicity. Keeping blueberries away from walnut trees prevents growth inhibition.

Pros of Avoiding Walnut Trees Near Blueberries:
• No juglone toxicity
• Full sunlight
• Prevents root competition
• Better nutrient access
• Reduces pest risk
• Healthier growth
• More fruit

Cons of Planting Walnut Trees Nearby:
• Toxic compounds
• Excessive shade
• Root competition

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8. Fennel

Fennel releases allelopathic chemicals that can inhibit the growth of nearby plants, including blueberries. It also attracts pests like aphids, which may spread to blueberry bushes. Additionally, fennel prefers neutral to alkaline soil, which can disrupt blueberry-friendly acidity.

Fennel has deep roots that compete with blueberry roots for water and nutrients. Its tall growth can also create unwanted shade, reducing blueberry productivity. Furthermore, fennel can spread aggressively, overtaking space meant for blueberries.

Instead of fennel, plant blueberries alongside low-growing flowers like lupines. These companions won’t interfere with blueberry growth. Avoiding fennel ensures blueberries remain healthy and productive.

Pros of Avoiding Fennel Near Blueberries:
• No growth inhibitors
• Maintains soil pH
• Reduces pest risk
• Prevents root competition
• Better sunlight
• Healthier bushes
• Higher yields

Cons of Planting Fennel Nearby:
• Allelopathic effects
• Attracts pests
• Excessive spreading

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9. Mint

Mint is an aggressive spreader that can overtake blueberry root space, competing for nutrients and water. It also prefers slightly alkaline soil, which can reduce soil acidity over time. Additionally, mint attracts pests like spider mites, which may infest blueberries.

Mint’s rapid growth can smother blueberry roots, limiting their access to essential resources. Its dense foliage can also reduce air circulation, increasing disease risks. Furthermore, mint requires frequent watering, which can lead to overly moist soil for blueberries.

Instead of mint, plant blueberries alongside creeping thyme, which tolerates acidic soil. This ensures both plants grow well without competition. Avoiding mint near blueberries prevents unnecessary stress.

Pros of Avoiding Mint Near Blueberries:
• Prevents overcrowding
• Maintains soil pH
• Reduces pest risk
• Better air flow
• Protects roots
• Healthier growth
• More fruit

Cons of Planting Mint Nearby:
• Invasive growth
• Alters soil pH
• Pest attraction

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10. Rosemary

Rosemary prefers dry, alkaline soil, which is the opposite of what blueberries need. Its strong root system can compete with blueberry roots for space and nutrients. Additionally, rosemary’s aromatic oils may inhibit blueberry growth in some cases.

Rosemary requires minimal watering, while blueberries need consistent moisture, creating an incompatible pairing. Its bushy growth can also block sunlight, reducing blueberry productivity. Furthermore, rosemary attracts certain pests that may also target blueberries.

Instead of rosemary, plant blueberries alongside acid-loving camellias. This ensures both plants thrive in similar conditions. Avoiding rosemary near blueberries prevents unnecessary competition.

Pros of Avoiding Rosemary Near Blueberries:
• No soil conflict
• Better moisture balance
• Reduces competition
• More sunlight
• Prevents root issues
• Healthier bushes
• Higher yields

Cons of Planting Rosemary Nearby:
• Soil incompatibility
• Excessive shade
• Pest risk

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 What Not To Plant Next To Blueberries (FAQs)

1. What types of plants generally don’t do well next to blueberries?

Plants that prefer alkaline or neutral soil conditions (pH above 5.5) are generally poor companions for blueberries. This includes many common garden vegetables like corn, tomatoes, squash, and most beans. Their differing soil pH requirements mean one plant will likely struggle in the conditions ideal for the other, leading to stunted growth or poor yields.

2. Should I avoid planting other fruit trees or bushes near blueberries?

While some fruit trees might tolerate slightly acidic conditions, many common fruit trees like apples, pears, and cherries prefer a more neutral to slightly alkaline pH. Planting them directly adjacent to blueberries can lead to competition for nutrients and water, and the differing pH needs will likely stress one or both plants. It’s best to give blueberries their own dedicated acidic zone.

3. Are there any herbs that should not be planted near blueberries?

Most culinary herbs, such as rosemary, lavender, thyme, and oregano, thrive in well-drained, neutral to slightly alkaline soil. Their preference for a higher pH makes them unsuitable companions for blueberries. Planting them too close would force them into conditions that are too acidic, potentially leading to nutrient deficiencies or poor growth for the herbs.

4. Can I plant acid-loving plants that aren’t blueberries near them?

Yes, other acid-loving plants can often be good companions for blueberries. Examples include azaleas, rhododendrons, camellias, and some conifers like pine trees. These plants share similar soil pH requirements, making them compatible neighbors. However, ensure there’s enough space to prevent overcrowding and competition for resources.

5. Why is root competition a concern when choosing companion plants for blueberries?

Blueberries have relatively shallow root systems, and they are particularly sensitive to competition for water and nutrients. Plants with aggressive or extensive root systems, regardless of their pH preference, can outcompete blueberries, leading to reduced growth and fruit production. Always consider the mature root spread of any potential companion plant.

6. Are there any common vegetables that are particularly bad companions for blueberries?

Yes, members of the brassica family, such as cabbage, broccoli, kale, and cauliflower, are particularly poor companions. They generally prefer alkaline soil and are heavy feeders, which can deplete nutrients quickly. Additionally, they can release compounds that are not beneficial to blueberry growth, making their close proximity detrimental.

7. What about plants that attract pests that also bother blueberries?

While not directly related to soil pH, it’s wise to avoid planting anything that is a known host for pests that also target blueberries. For instance, some rose varieties can share certain fungal diseases or insect pests with blueberries. Researching common pests and diseases for both blueberries and potential companion plants is a good preventative measure

Conclusion

Choosing the right companion plants for blueberries is crucial for their health and productivity. Avoiding the 10 plants listed above ensures your blueberries receive the right nutrients, sunlight, and soil conditions. By making informed planting decisions, you can maximize your blueberry harvest and enjoy thriving bushes for years.

Consider replacing incompatible plants with acid-loving companions like azaleas, cranberries, or heather. These plants share similar growing requirements and won’t harm your blueberries. Proper spacing and soil management also play a key role in blueberry success.

Ready to optimize your blueberry garden? Start by removing any harmful neighbors and replacing them with beneficial companions. Share this guide with fellow gardeners to help them avoid common planting mistakes. Happy gardening!