The Best Marigolds for Pest Control

Marigolds are not only beautiful and vibrant in color, but they also serve as natural insect repellents. They contain compounds that repel pests like aphids, whiteflies, and nematodes. Moreover, these flowers are easy to grow and care for, making them an excellent choice for gardeners who prefer natural methods of pest control.

Choosing the Right Marigold Variety

There are various types of marigolds available in the market, but not all of them possess pest-repelling properties. Here are some of the best marigold varieties that you can use for pest control:

African Marigolds

African marigolds (Tagetes erecta) are the tallest and largest marigold variety, reaching up to three feet tall. They have large, double blooms in bright orange, yellow, and red hues. African marigolds are effective against root-knot nematodes, which are soil-borne pests that attack plant roots.

French Marigolds

French marigolds (Tagetes patula) are smaller than African marigolds, growing up to 12 inches tall. They have single or double blooms in shades of yellow, orange, and burgundy. French marigolds are effective against whiteflies, a common pest that sucks sap from the leaves of plants.

Pot Marigolds

Pot marigolds (Calendula officinalis) are edible and medicinal marigolds that are often used in herbal remedies. They have bright orange or yellow blooms and are effective against pests like aphids and spider mites.

How to Grow Marigolds

Marigolds are easy to grow and care for. Here are some tips on how to grow marigolds:

Planting

Marigolds can be grown from seeds or transplants. If you're ing from seeds, sow them directly into the soil after the last frost date. If you're using transplants, wait until after the last frost date and then plant them in a sunny spot with well-draining soil.

Watering

Marigolds require moderate watering. Water them deeply once a week or whenever the top inch of soil feels dry.

Fertilizing

Marigolds don't require much fertilizer. You can add a balanced fertilizer once a month during the growing season.

Deadheading

Deadheading is the process of removing spent blooms from the plant. It encourages the plant to produce more flowers and prolongs the blooming period.

Using Marigolds for Pest Control

Marigolds can be used in various ways to repel pests. Here are some methods:

Companion Planting

Companion planting involves planting different plants together to improve their growth and health. Marigolds make excellent companion plants because they repel pests and attract beneficial insects like ladybugs and lacewings.

Pest-Repelling Spray

You can make a natural pest-repelling spray by infusing marigold petals in water. Let the mixture sit overnight and then strain it. Pour the liquid into a spray bottle and use it to spray on plants that are affected by pests.

Nematode Control

If you're dealing with nematodes, plant marigolds around the affected area. The roots of marigolds secrete a compound called alpha-terthienyl, which is toxic to nematodes.

Other Benefits of Marigolds

Apart from pest control, marigolds offer several other benefits:

Attracting Pollinators

Marigolds attract bees and butterflies, which are essential for pollination.

Medicinal Properties

Pot marigolds have anti-inflammatory properties and can be used in herbal remedies for skin conditions and digestive issues.

Culinary Uses

Pot marigolds have a slightly bitter taste and are often used in soups, stews, and salads.

Frequently Asked Questions (FAQs)

Q: Can marigolds repel all types of pests?

A: No, marigolds are effective against some pests but not all. They're most effective against root-knot nematodes, whiteflies, and aphids.

Q: How often should I water my marigolds?

A: Marigolds require moderate watering. Water them deeply once a week or whenever the top inch of soil feels dry.

Q: Can I use marigolds indoors to repel pests?

A: Yes, you can use potted marigolds indoors to repel pests like spider mites and aphids.

Q: Are marigolds safe for pets?

A: Marigolds are non-toxic and safe for pets.

Q: How long do marigolds bloom?

A: Marigolds bloom from early summer until fall.


In marigolds are an excellent choice for gardeners who prefer natural methods of pest control. They're easy to grow and care for, and they offer several other benefits apart from pest control. By choosing the right marigold variety and using them in various ways, you can keep your garden free from pests without resorting to harmful chemicals.