Daily gardening tips: Plant marigolds to repel nematodes in the soil

Nematodes are tiny, worm-like organisms that inhabit the soil and can cause damage to various plants, often leading to stunted growth and decreased yield

Daily gardening tips: Plant marigolds to repel nematodes in the soil

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Nematodes are tiny, worm-like organisms that inhabit the soil and can cause damage to various plants, often leading to stunted growth and decreased yield. However, there's a simple and natural way to combat nematodes in your garden – by planting marigolds! Marigolds contain compounds that repel nematodes, making them an excellent addition to any garden. In this article, we'll explore everything you need to know about using marigolds to get rid of nematodes and promote a healthy garden.

Understanding Nematodes

Before we delve into the benefits of marigolds, it's important to understand nematodes. Nematodes are microscopic roundworms that live in the soil. While some nematodes are beneficial and help break down organic matter, others are parasitic and feed on plant roots, causing damage and hindering plant growth. Typically, nematodes become a significant problem when the soil is not properly managed or lacks healthy biodiversity.

Why Marigolds?

Marigolds, with their vibrant and colorful flowers, do more than just beautify any garden. They naturally produce chemical compounds, such as thiophenes and limonoids, which repel nematodes. Planting marigolds acts as a natural form of pest control, effectively deterring nematodes from feasting on the roots of your plants. Marigolds also work to suppress the hatching of nematode eggs, thus reducing their population in the soil over time.

Choosing the Right Marigolds

When selecting marigolds for nematode control, it's essential to choose the right varieties. Look for French marigolds (Tagetes patula) or African marigolds (Tagetes erecta), as they have been found to be most effective in repelling nematodes. Both these varieties produce the necessary compounds in their roots that nematodes find repugnant.

How to Plant Marigolds for Nematode Control

Here's a step-by-step guide to help you correctly incorporate marigolds into your garden for nematode control:

A. Determine the Planting Area

Identify the areas in your garden that are most affected by nematodes. These could be spots where plants consistently display signs of nematode damage.

B. Prepare the Soil

Remove any weeds or plant debris from the planting area. Loosen the soil and incorporate organic matter, such as compost or well-rotted manure, to improve its fertility and structure. This step is crucial for the marigolds to establish healthy root systems.

C. Plant the Marigolds

Dig holes in the prepared soil, ensuring they are spaced appropriately according to the specific marigold variety. Place the marigold seedlings in the holes, cover their roots with soil, and gently firm the soil around them. Water thoroughly.

D. Companion Planting

For maximum nematode control, consider interplanting marigolds with susceptible plants. The marigolds will act as a natural barrier, protecting neighboring plants from nematode damage. This technique is particularly useful when dealing with nematode-prone crops, such as tomatoes, peppers, and potatoes.

Maintenance and Fall Cleanup

To reap the full benefits of planting marigolds as a nematode control measure, it's necessary to give them proper care:

  • Regularly water the marigolds, ensuring they receive adequate moisture without becoming waterlogged.
  • Remove and dispose of any marigold plants showing signs of nematode infestation or disease to prevent the spreading of pests.
  • In late fall, remove the marigold plants entirely, including their roots. This fall cleanup will help prevent nematodes from overwintering in the soil and reduce their population for the following growing season.


By incorporating marigolds into your garden, you can naturally repel nematodes and promote healthier plant growth. Remember to choose the appropriate marigold varieties, plant them strategically, and provide the necessary maintenance. With their cheerful blooms and pest-repelling properties, marigolds are a valuable addition to any garden. Happy gardening!

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