Do Marigolds Repel Tomato Hornworms? If So, How Far Apart Should They Be Planted from the Tomatoes?

Tomato hornworms are voracious pests that can quickly decimate tomato plants. Luckily, natural pest control methods like planting marigolds can help deter these unwanted insects.

Do Marigolds Repel Tomato Hornworms?

Yes, marigolds contain compounds that repel tomato hornworms, including pyrethrum and limonene. When these plants are crushed, they release these compounds into the air, creating a strong scent that hornworms find offensive.

How Far Apart Should Marigolds Be Planted from Tomatoes?

To effectively deter tomato hornworms, marigolds should be planted close to tomato plants, but not directly adjacent to them. A spacing of 1-2 feet between the two plant types is ideal for maximum pest control.

Other Benefits of Planting Marigolds Near Tomatoes

  • Improved pollination: Marigolds attract pollinators like bees and butterflies, which can help boost tomato yields.
  • Pest deterrents: Marigolds also repel other common tomato pests like aphids, thrips, and nematodes.
  • Companion planting: Marigolds are known to improve the growth of neighboring plants, including tomatoes, as they release beneficial compounds into the soil.

FAQs

  • Do all marigold varieties repel tomato hornworms? Yes, all marigold varieties contain the compounds that repel tomato hornworms, but some varieties may be more effective than others.
  • Can marigolds cure hornworm infestations? No, marigolds are primarily a preventative measure and may not be effective in controlling severe hornworm infestations.
  • How often should I plant marigolds around my tomato plants? Every 4-6 weeks for continuous protection.
  • What other plants can I use to repel tomato hornworms? Basil, catnip, mint, and petunias are also known for their hornworm-repelling properties.
  • Are marigolds safe for tomatoes? Yes, marigolds are safe for tomatoes and will not harm the plants.

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