The Ultimate Onion Companion Planting Chart: How to Grow Onions with Other Plants

Are you looking for a way to make the most out of your onion crop this season? Look no further than the onion companion planting chart! This handy guide is designed to help you plant your onions alongside other plants in a way that maximizes both their growth and yield. Whether you're a seasoned gardener or just ing out, this chart is an essential tool for anyone looking to create a healthy and bountiful garden.

What is Companion Planting?

Before we dive into the onion companion planting chart, let's take a moment to explore what companion planting is and why it's so important. Companion planting is the practice of planting different crops together in order to create a mutually beneficial environment. When correctly, companion planting can lead to healthier soil, fewer pests, and higher yields.

The Benefits of Companion Planting

There are many benefits to adopting a companion planting strategy in your garden. Some of these benefits include:

• Improved soil health

• Natural pest control

• Higher yields

• Disease prevention

• Better utilization of space

• Increased biodiversity

The Drawbacks of Companion Planting

While there are many benefits to companion planting, it's important to note that there are also some potential drawbacks. These include:

• Difficulty in planning and implementing

• Possible competition for resources

• Some plants may attract pests or diseases

• May require more maintenance and attention

The Onion Companion Planting Chart

Now that we have a better understanding of what companion planting is and why it's important, let's dive into the onion companion planting chart!

Companion Plants for Onions

Onions can be planted alongside a variety of other crops, including:

• Carrots

• Lettuce

• Tomatoes

• Peppers

• Beets

• Celery

• Chamomile

• Marigolds

• Parsley

• Thyme

Why These Plants Work Well with Onions

So why do these plants work so well with onions? Let's take a look at each one in more detail:

Carrots

Carrots and onions make great companions because they have different root depths. Onions have shallow roots, while carrots have deeper ones. This means that they don't compete for nutrients and water, allowing both crops to thrive.

Lettuce

Lettuce and onions are a classic pairing in salads, but did you know they make great companions in the garden too? Lettuce helps shade the soil around the onion plant, keeping it cool and moist. This can help prevent the onion from bolting and promotes healthy growth.

Tomatoes

When planted together, onions can help repel pests that commonly affect tomato plants, such as aphids and whiteflies. In return, tomatoes can provide shade for young onions, protecting them from the hot sun.

Peppers

Onions and peppers are a great combination because they both prefer well-draining soil and benefit from regular watering. Plus, they make a tasty addition to any stir-fry or salsa!

Beets

Beets and onions have similar requirements when it comes to soil and water, making them ideal companions in the garden. Plus, beets can help loosen up the soil around the onion plant, making it easier for the roots to grow deep.

Celery

Celery and onions work well together because they have different nutritional needs. Celery is a heavy feeder, meaning it requires a lot of nutrients, while onions are light feeders. This means they don't compete for resources and can both thrive in the same bed.

Chamomile

Chamomile is a natural insect repellent and can help keep pests away from your onion crop. Plus, it has shallow roots that won't interfere with the growth of your onions.

Marigolds

Marigolds are another natural pest repellent and can help protect your onion crop from harmful insects. Plus, their bright yellow and orange blooms add a pop of color to your garden.

Parsley

Parsley and onions make great companions because they have similar growing requirements. Plus, parsley can help attract beneficial insects, such as ladybugs and lacewings, which can help control pests.

Thyme

Thyme is a natural insecticide and can help keep pests away from your onion crop. Plus, its aromatic leaves add a delicious flavor to any dish!

Plants to Avoid Planting with Onions

While there are many plants that work well with onions, there are also some that should be avoided. These include:

• Beans

• Peas

• Corn

• Garlic

• Shallots

• Leeks

Why These Plants Should Be Avoided

So why should you avoid planting these crops alongside onions? Let's take a closer look:

Beans and Peas

Beans and peas are both legumes, which means they have the ability to fix nitrogen in the soil. While this can be beneficial for some crops, it can actually inhibit the growth of onions.

Corn

Corn is a heavy feeder and requires a lot of nutrients and water. When planted alongside onions, it can compete for these resources, leading to stunted growth and lower yields.

Garlic, Shallots, and Leeks

While these plants are all members of the allium family, they should not be planted alongside onions. This is because they can attract the same pests and diseases, leading to a higher risk of infection.


The onion companion planting chart is an essential tool for any gardener looking to grow onions alongside other plants. By choosing the right companions for your onions, you can create a healthy and bountiful garden that maximizes both growth and yield. Remember to pay attention to the needs of each plant and adjust your planting strategy accordingly.

FAQs

1. How often should I water my onion plants?

Onion plants require regular watering, especially during hot, dry weather. Aim to water them deeply once or twice a week, making sure the soil is moist but not waterlogged.

2. Can I grow onions in containers?

Yes! Onions can be grown in containers as long as they are at least 6 inches deep and have good drainage. Plant them in a well-draining potting mix and make sure they receive plenty of sunlight.

3. What pests should I watch out for when growing onions?

Onions can be susceptible to a variety of pests, including thrips, onion maggots, and cutworms. Keep an eye out for signs of damage and treat any infestations promptly.

4. When should I harvest my onions?

Onions are ready to harvest when the tops begin to yellow and fall over. Gently lift them out of the soil and allow them to dry in a cool, dry place for several weeks before storing.

5. Can I use the green tops of my onions in cooking?

Absolutely! The green tops of onions are edible and can be used in a variety of dishes, such as soups, stews, and salads.