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Companion Planting: The Magic of Onion and Garlic

onion and garlic companion planting

The Benefits of Onion and Garlic Companion Planting

Companion planting is the practice of planting different crops together to enhance their growth and protect them from pests and diseases. One of the most popular combinations in companion planting is onion and garlic. Not only do they complement each other in flavor, but they also provide a range of benefits for your garden.

Repelling Pests and Diseases

Onions and garlic are natural insect repellents. They contain sulfur compounds that repel many common garden pests, such as aphids, spider mites, and cabbage worms. These compounds also have antifungal and antibacterial properties that can help protect your plants from diseases like blight and mildew.

Improving Soil Health

Onions and garlic are also good for the soil. They are members of the allium family, which includes leeks, chives, and shallots. Alliums are known for their ability to improve soil health by increasing its fertility and helping to break up compacted soil. They also release natural chemicals that inhibit the growth of weed seeds.

Enhancing Flavor

Onions and garlic can enhance the flavor of many different vegetables, herbs, and fruits. They add depth and complexity to dishes, and their pungent aromas can attract pollinators to your garden. In addition, they are relatively easy to grow and require minimal maintenance.

How to Plant Onions and Garlic Together

Planting onions and garlic together is straightforward. Here are some tips to get you ed.

Choosing Varieties

When selecting onion and garlic varieties to plant together, look for ones that have similar growth habits and maturity times. This will make it easier to harvest them at the same time. You can also choose varieties that complement each other in flavor.

Preparing the Soil

Onions and garlic prefer well-drained soil with a pH between 6.0 and 7.0. Prepare your soil by adding compost or aged manure to improve its fertility. Avoid planting in soil that has recently had alliums or other members of the onion family, as this can increase the risk of disease.

Planting and Spacing

Plant onions and garlic in the fall or early spring, depending on your climate. Plant them about 2-3 inches deep and 4-6 inches apart in rows that are spaced 12-18 inches apart. Water them well after planting, and keep the soil moist but not waterlogged.


Onions and garlic require minimal maintenance once they are established. Keep the soil moist but not saturated, and weed regularly to prevent competition for nutrients. You can also fertilize them with a balanced fertilizer once or twice during the growing season.

Companion Plants for Onions and Garlic

Onions and garlic can be planted with a variety of other vegetables and herbs. Here are some popular companion plants to consider.


Tomatoes and onions are a classic combination in many dishes, and they also work well together in the garden. Tomatoes attract pollinators, while onions repel pests and diseases.


Peppers and garlic have similar heat levels, which makes them a natural pairing. Peppers also benefit from the insect-repelling properties of garlic.


Carrots and onions are often planted together in traditional French gardens. The carrots benefit from the natural weed suppression provided by the onion's foliage, while the onions repel carrot flies.


Parsley is a good companion plant for both onions and garlic. It attracts beneficial insects like ladybugs and lacewings, which can help control aphids and other pests.

FAQs: Your Questions Answered

Q: Can I plant onions and garlic in containers?

A: Yes, onions and garlic can be grown successfully in containers. Use a container that is at least 12 inches deep and wide, and make sure it has good drainage. Plant the bulbs about 2-3 inches deep and 4-6 inches apart, and water them regularly.

Q: How long does it take for onions and garlic to grow?

A: Onions and garlic typically take between 90 and 120 days to mature. The exact timing will depend on the variety you choose and your growing conditions.

Q: Do I need to fertilize onions and garlic?

A: Onions and garlic don't require a lot of fertilizer, but they can benefit from a balanced fertilizer once or twice during the growing season. Use a fertilizer that is low in nitrogen, as too much nitrogen can cause the bulbs to split.

Q: Can I plant onions and garlic near beans?

A: Yes, onions and garlic can be planted near beans. They can help repel pests like aphids and spider mites that can damage bean plants.

Q: Can I harvest onions and garlic at the same time?

A: Yes, you can harvest onions and garlic at the same time. Wait until the foliage s to yellow and die back, then carefully dig up the bulbs. Store them in a cool, dry place for several weeks to cure before using or storing.

Onion and garlic companion planting is a great way to enhance your garden's productivity and flavor. By combining these two versatile plants, you can repel pests and diseases, improve soil health, and create a delicious harvest. With a little planning and care, you can enjoy the magic of onion and garlic in your garden year after year.

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