Incompatible Plants: 20 Plants & What They Can’t Grow With

Garden 9

Companion planting has gained great momentum amongst novice and experienced gardeners alike; especially with those who aim to grow maximum food in minimum space. Some plants like marigolds and a few other aromatic herbs are grown exclusively for the protective effect they seem to have against many garden pests, but not all vegetables appreciate their presence. When space is premium, you should choose your bedfellows carefully, so it helps to know not only the ideal companions of each plant but their enemies too.

The following list of incompatible plants, mainly compiled from the experience of seasoned gardeners, may have the backing of a few scientific experiments or explanations, but not in every case. Nevertheless, it may help you to be cautious of what you grow together in your garden, and perhaps encourage you to add your own insights to the collective knowledge.

Popular Vegetables & What They Can’t Grow With

Asparagus – Asparagus seems to be happy to have nasturtiums and marigolds around, as well as herbs like basil and parsley, to take care of pest problems, but it does not like garlic and fennel in the neighborhood.

Fennel is a bad companion to a lot of veggies, but the problem between garlic and asparagus could stem from competition for the same nutrients by these sulfur-rich veggies or some other reason. Try to avoid all onion family plants near the asparagus patch for good measure. After all, the asparagus is going to grow in that same spot for years to come.

Beans – Being a legume, bean plants have the capacity to enrich the soil by nitrogen fixing, so they are often planted in between other veggies, especially spinach, cucumber, corn, and potato.

However, beans shouldn’t be planted near veggies of the cabbage and onion families. These include cauliflower, broccoli, kale, cress, mustard, garlic, chives and leeks.

Broccoli – This green delight loves to have a host of aromatic herbs around, from alliums (onion family) to many mint family plants like peppermint, catnip, sage, oregano, pennyroyal and rosemary. But surprisingly, it does not like basil. Also, avoid planting beans, peas, tomatoes, and strawberry plants near broccoli.

Carrots – Carrots thrive beside legumes like beans and peas and nightshade family vegetables. They have no problem sharing the space with root vegetables like radish, onion, and leeks, or with low growing plants like lettuce and parsley.

But celery and dill are two herbs carrots are not happy about. Avoid growing these in the same bed as carrots.

Cabbage – This soft-headed vegetable is prone to a large number of pests, so it enjoys the companionship of many herbs like dill, celery, garlic, onions mints, thyme and rosemary that will help keep these critters at bay. But basil is an exception, so avoid planting this herb near cabbage.

Similarly, cabbage does not like tomato plants in its bed although it doesn’t seem to mind having potato plants as companions. Beans are no favorite of this cruciferous vegetable, especially pole beans.

Cauliflower – This popular cruciferous vegetable likes to have onion family plants and aromatic herbs as companions to ward off pests. But cauliflower has animosity towards basil, as in the case of cabbage.

Tomatoes are incompatible with cauliflower, so are beans. Also, avoid planting cauliflower in your strawberry patch, and vice versa.

Corn – The whole modern day idea of plant companionship hinges on the famous 3-sisters relationship between corn, beans, and squash. In fact, corn is a good companion to not only these, but other members of the cucurbit family such as melon, pumpkin, and cucumber, as well as most legumes and potatoes. Tomato is an exception, though.

Both corn and tomatoes are heavy feeders, which could be a reason for this incompatibility. If the soil is rich enough, they may not suffer as many ill effects when planted close to each other. The corn earworm, also called tomato fruit worm, is a common pest of both the plants, so it makes sense to keep them away from each other.

Cucumbers – Cucumbers are a highly rewarding vegetable suitable for even novice gardeners. It is a blessing that cucumbers are great companion plants for beans and peas, as well as almost all vegetables of cabbage and nightshade families. Potato is the exception here, so don’t plant cucumbers near your potato plants.

Cucumbers seem to hate the company of aromatic herbs such as basil, sage, marjoram and rosemary for some reason.

Kale – This dark green leafy vegetable with superfood tag is a success in most gardens although it belongs to the pest-prone cabbage family. It obviously enjoys the protection offered by garlic, onions, dill, nasturtium, and, of course, mint family herbs like thyme, sage, and rosemary. However, for some reason, kale hates the company of basil, which also belongs to the mint family Lamiaceae.

Kale also doesn’t get along well with tomato, although it’s fine with potato. Strawberry is another plant that kale is not comfortable with. The feeling is mutual, so keep them far apart.

Lettuce – These delicate leafy greens may seem like a cabbage relative, especially the head-forming types, but they actually belong to the daisy family. They do make good companions for kale and cauliflower, but not for most other members from the same cruciferous family. Lettuces are known for being intolerant of Allium family members, including onions and garlic.

Melon – Melons are great companions to corn just as squash is. Spreading along the ground, they suppress weeds. Not only that, their large leaves act as an insulating layer over the soil, keeping the roots warm when it is cold, and cool when the temperature rises.

Melons are good with sunflowers and tomatoes too, but they do not like the company of potatoes, even though it is closely related to tomato.

Onion – This smelly bulb is a great companion to both nightshade vegetables and cabbage family. It surprisingly gets along with root crops like carrots and beets too.

What onions don’t seem to like are members of the legume family, which includes different types of beans and peas. Another vegetable incompatible to onions are asparagus, so keep them away from your asparagus patch.

Peppers – Peppers belong to the nightshade family, but are generally unaffected by the pest and disease problems encountered by other members of the family like tomatoes, potatoes, and eggplant. So peppers have no issues growing beside them, but they cannot stand kohlrabi and fennel for some reason.

Fennel is antagonistic to nearly all plants in the vegetable garden, but that is not the case with kohlrabi. Peppers don’t seem to have any issues with other members of the cruciferous family to which kohlrabi belongs.

Potatoes – Potato plants have a large number of companions, but their enemy list is just as formidable. They get along well with companions big and small, like corn, beans, peas, and cabbage family vegetables. They also benefit from the company of insect repelling marigolds, nasturtium, and catnip.

Potatoe’s enemies include cucumber, pumpkin, squash, tomato, sunflower and spinach. Potatoes and tomatoes being both nightshade family plants with common pests and diseases may explain their incompatibility. Other vegetables might be competitors for nutrients and legroom.

Spinach – Spinach is a good companion to legumes like beans and peas. Spinach gets along well with strawberries and most cabbage family veggies as well. However, it doesn’t seem to like potatoes growing close by. One reason could be spinach’s shallow roots.

Potato plants, even though they are much larger than spinach, tend to keep their roots closer to the top soil. Competition for water and nutrients could play a part in making them enemies. The lush top growth of potato plants block out the sun. This could be another reason why spinach is not so fond of potatoes.

Squash – This tasty veggie gets along well with beans, onions, and radishes, and appreciates having insect-repellant herbs and protective plants like mint and catnip marigold and nasturtium. What is surprising about squash is that, while it makes a good companion to melons, it cannot coexist happily with pumpkins. Squash is incompatible with potatoes as well.

Strawberry – These plants like to have bush beans planted near them, and appreciate the presence of onions, thyme, and sage, which help keep away pests that. Strawberry plants hate having any of the pest-prone cabbage family veggies close by, for obvious reasons.

Tomato – This garden staple attracts many pests which may affect other Solanaceae (nightshade) family veggies like potato, eggplant, and peppers, so it may be a good idea to avoid planting them together. Keep that in mind when you do crop rotation too since many disease-causing microbes as well as eggs and larvae of common pests may remain in the soil for quite some time. Also, do not plant tomatoes with corn, and cabbage family veggies.

Rosemary – This delightful herb not only looks great and smells great but does a wonderful job attracting pollinators. Have several plants around, particularly near cruciferous vegetables. But avoid planting rosemary near cucumbers, this is not a good match.

Garlic – Most gardeners view garlic as a garden savior and grow it all over the place to keep the bugs away with its pungent smell. It is a great addition to any vegetable garden, especially when planted near tomatoes, radishes, roses, and cabbage family vegetables. However, garlic’s ability to repel many garden pests does not seem to endear it to several other veggies.

Leguminous plants such as beans and peas fail to thrive when garlic is around. They show stunted growth and reduction in yield, especially snow peas. But many gardeners assure that there’s no problem as long as you leave sufficient distance between the bean plants and garlic so that their roots don’t have to share the same space. Do not plant garlic in your asparagus patch, though.

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