Common Vegetables That Should Not Be Planted Together

It’s important to remember that not all vegetables are meant to be planted together. You should remember that while some vegetables do well when grown together, others may negatively affect each other’s growth. By avoiding these plant combinations, you can prevent the spread of diseases and pests, improve yield and flavor, and save yourself time and effort. Be sure to research which plants are compatible before starting your garden.

Common Vegetables That Should Not Be Planted Together

Beans and Onions

Planting these two crops nearby can result in stunted growth, lower yields, and increased susceptibility to pests and diseases. Beans fix nitrogen in the soil, while Onions need a low-nitrogen environment. When planted together, Beans tend to release too much nitrogen into the surrounding soil, resulting in poor Onion growth. Moreover, both plants require different watering schedules; Onions prefer less water than green Beans.

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Common Vegetables That Should Not Be Planted Together: Beans and Onions

If you must plant these two vegetables near each other or have limited space in your garden bed, consider adding a barrier, such as a raised bed or container garden. This will help prevent cross-contamination of nutrients and reduce the risk of pest infestation. Generally, it’s always best to research companion planting before starting your vegetable garden.

Tomatoes and Corn

Tomatoes and Corn are popular garden crops but should not be planted together. Tomatoes and Corn shouldn’t be planted together because they have different nutrient requirements. Corn is a heavy nitrogen feeder, while Tomatoes require more phosphorus and potassium. When grown together, these plants will compete for nutrients in the soil, which can lead to nutrient deficiencies. Another issue with planting Tomatoes and Corn together is that they attract similar pests and diseases, such as aphids, caterpillars, earworms, cutworms, blight, and wilt.

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Tomato Gardening

Planting them close to each other increases the risk of pest infestations spreading between plants. Another aspect to consider when planting vegetables close by is their height difference: tall plants overshadow smaller ones blocking out light and reducing the photosynthesis process affecting growth yield negatively, which occurs when growing Tomatoes under or near taller Corn stalks.

Cucumbers and Potatoes

Cucumbers and Potatoes are popular garden vegetables that many people enjoy growing in their backyard. However, planting these two crops together is not recommended as they can negatively impact each other’s growth. This is because Cucumbers are known to attract pests such as beetles and aphids, while Potatoes are susceptible to blight. When planted together, the pests attracted by Cucumbers may also attack the Potato plants, leading to stunted growth or even death of the crop.

Additionally, Cucumber and Potato plants require different soil conditions for optimal growth.
Planting them together can lead to an imbalance of nutrients, which can stunt their growth or cause disease development. Therefore, planting Cucumbers and Potatoes in separate areas of your garden is best to ensure healthy growth and harvests for both crops.

Asparagus and Garlic

Asparagus and Garlic are two popular vegetables that many gardeners like to grow. Asparagus takes several years to establish itself in your garden and requires a lot of nutrients from the soil. Garlic, on the other hand, grows quickly but does not require as much fertilization. When planted together, Garlic can stunt the growth of Asparagus by competing for nutrients in the soil. Additionally, planting these two crops too close together may increase their susceptibility to pests and diseases.

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Garlic Plant

However, if you still want to plant them side by side, consider using companion plants such as Basil or Parsley, which can help deter pests naturally without harming either crop. Planning your vegetable garden carefully and researching which plants grow well together before planting is important. While Asparagus and Garlic may seem like a good pairing at first glance due to their similar growing conditions, keeping them separate for optimal growth and yield is better.

Pumpkins and Summer Squash

Pumpkins and Summer Squash are delicious and versatile vegetables commonly grown in home gardens. However, planting them together is not recommended as they can negatively affect each other’s growth. Pumpkins can shade the Summer Squash plants when planted together, preventing them from receiving enough sunlight to grow properly. In addition, Pumpkins are heavy feeders and require a lot of nutrients from the soil.

When planted with Summer Squash, they may compete for these nutrients causing both plants to suffer. To avoid these issues, it’s best to plant Pumpkins and Summer Squash in separate areas of your garden or at least provide adequate spacing between them if you decide to plant them together. Doing so will ensure optimal growth for both vegetables without any negative effects on each other.

Celery and Carrots

Celery and Carrots are popular vegetables packed with nutrients, making them great additions to any garden. However, planting them together may not be the best idea. One reason Celery and Carrots should not be planted together is that they have different soil requirements. Celery prefers moist soil, while Carrots prefer well-drained soil. Planting them in the same bed can result in either one or both plants not growing properly. Another reason is due to their size differences.

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Celery Gardening

Carrots have long roots that can grow up to a foot deep into the ground, while Celery has shallow roots. The competition for water and nutrients between these two plants can lead to stunted growth or even death. In addition, planting Celery and Carrots together can attract similar pests, such as aphids and Carrot rust flies, which may damage both crops if left unchecked. To avoid these issues, it’s best to plant Celery and Carrots separately in different beds or containers with appropriate soil conditions suitable for each plant’s needs.

Lettuce and Cauliflower

Lettuce and Cauliflower are two common vegetables that many gardeners like growing together because they prefer cooler temperatures. However, planting these two crops side by side might not be the best idea. Lettuce is a shallow-rooted plant requiring plenty of water, while Cauliflower has deep roots that can reach into the soil for moisture. Planting them too close together increases the risk of disease transmission between plants.

Diseases such as clubroot, black rot, and downy mildew can spread easily in this scenario. To avoid such problems when growing your vegetable garden, giving each crop enough space to thrive independently without competing with others is important. Consider rotating your crops annually or using companion planting techniques instead of planting them close together if you want a bountiful harvest.

Parsnips and Carrots

Parsnips and Carrots are root vegetables from the same family but have different growth habits. Parsnips require a longer growing season than Carrots and prefer cooler temperatures. Planting Parsnips and Carrots together can cause problems because their roots compete for space in the soil. The result is smaller, misshapen vegetables that may not develop fully. Moreover, planting these two crops together increases the risk of pest infestations such as Carrot rust fly or Parsnip webworm.

To avoid these issues, it’s best to plant Parsnips and Carrots separately or at least keep them spaced apart by several feet. While it may be tempting to plant all your favorite veggies together in one garden bed, doing so can lead to disappointing results. By being mindful of which vegetables should not be planted together, like Parsnips and Carrots, you’ll increase your chances of a bountiful harvest come harvest time.

Eggplant and Fennel

If you plan on growing Eggplant and Fennel in your garden, it’s important to know that these two vegetables should not be planted together. While both are delicious additions to any meal, they have different soil requirements and can harm each other when grown side by side. In addition to their differing soil needs, Eggplants and fennels attract different pests and diseases. Eggplants are susceptible to flea beetles and spider mites, while aphids often target Fennel.

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Another issue with planting Eggplant and Fennel together is their size difference. Fennel can grow quite tall compared to Eggplant, which may end up overshadowing the smaller plant causing stunted growth or no growth. To avoid any issues when planting vegetables in your garden, it’s always best to research what plants work well together beforehand to achieve maximum yield potential for each crop separately.

Chives and Peas

When it comes to planting vegetables, many people tend to overlook the importance of companion planting. Certain vegetables can benefit each other when planted together, while others can stunt growth or attract pests. One common mistake is planting Chives and Peas nearby. Chives are known for their strong scent, which helps repel insects that could damage nearby plants.

Peas require nitrogen-rich soil to thrive, but Chives are known for depleting nutrients like nitrogen. This further emphasizes why these two should not be planted together, as it may reduce the overall health of your crop. By being mindful of what you plant together, you can ensure a healthy and prosperous harvest season.

Lettuce and Garlic

Lettuce and Garlic are two popular vegetables you might want to avoid planting together. While they both have health benefits, combining them in the garden can lead to some not-so-desirable outcomes. Lettuce is a cool-season crop that prefers mild temperatures and consistent moisture levels. On the other hand, Garlic grows best in well-drained soil with plenty of sunlight. Mixing these two plants can result in stunted growth for Lettuce as it competes for nutrients with the Garlic bulb.

Moreover, Garlic’s pungent aroma may affect the delicate flavor of Lettuce leaves when planted close together. This could impact not only how your salad tastes but also its texture. To prevent such issues, keep at least 12-18 inches between Lettuce and Garlic when planting them side by side. You might also consider intercropping with companion plants like Spinach or Radish to improve soil quality while minimizing crop competition.

Cucumber and Rosemary

These two plants have different needs that can interfere with each other’s growth. Cucumbers are known for their sprawling vines spread across the ground, while Rosemary is a bushy herb that grows straight up. When planted together, the Cucumber vine can easily overtake the Rosemary plant and prevent it from receiving adequate sunlight. Additionally, Cucumbers require consistent moisture levels in the soil to thrive. In contrast, Rosemary prefers a drier environment with well-draining soil.

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Cucumber Harvest

Planting these two together can cause problems as they have opposite watering needs. Another issue when planting Cucumbers and Rosemary together is pest control. Cucumber beetles are attracted to both plants and can quickly infest your entire garden if not controlled properly. To avoid issues between these two plants, consider planting them separately or providing ample space between them. This will ensure that they receive all their requirements for healthy growth without competing against each other for resources.

Kohlrabi and Fennel

Despite their benefits, Kohlrabi and Fennel should not be planted together in your garden. While they may look like good companions due to their similarity in size and shape, they have different soil requirements. Kohlrabi prefers moist soil with plenty of organic matter, such as compost or aged manure.

In contrast, Fennel likes well-draining, slightly alkaline soil. Planting these two vegetables together means one will suffer from too much moisture or overly dry conditions. Additionally, Kohlrabi attracts pests such as aphids, while Fennel repels them. By planting them near each other, you risk attracting more pests than necessary to your garden.


Planting the wrong vegetables together can negatively affect your garden’s growth and productivity. Avoiding these common combinations will save time and effort and ensure that your plants grow optimally. It is important to remember that each vegetable has its own unique needs, and when planted with incompatible crops, they may compete for nutrients or attract pests that are harmful to their growth. Therefore, caring for our gardens is crucial to growing compatible vegetables in designated areas.


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