Question 1

What are the benefits of French marigold for the garden?

Accepted Answer

French marigolds (Tagetes patula) deter root-knot nematodes, repel whiteflies through limonene compound, attract beneficial predator insects and pollinators, work as trap crops for snails, produce root exudates that suppress nematode egg hatching, and add beauty while supporting biodiversity.

Question 2

Do French marigolds deter nematodes?

Accepted Answer

Yes, French marigolds produce alpha-terthienyl root exudate that inhibits root-knot nematode egg hatching. UF/IFAS recommends planting as cover crop two months before planting vegetables, or interplanting throughout beds year-round. Their suppression action extends about 3 feet in diameter.

Question 3

What's the difference between French marigold and pot marigold?

Accepted Answer

French marigolds (Tagetes patula) are Mexican natives used for pest control with distinctive odor. Pot marigolds (Calendula officinalis) are completely different species used extensively in cosmetics. Despite similar common names, they look very different and have different garden uses.

Question 4

Do French marigolds repel whiteflies?

Accepted Answer

Yes, a 2019 study found French marigolds reduce whitefly populations in tomatoes. The volatile compound limonene they produce repels these pests. Plant marigolds alongside tomatoes, peppers, and other vegetables susceptible to whitefly infestations for natural pest control.

Question 5

Can you plant French marigolds with vegetables?

Accepted Answer

Yes, plant French marigolds within every vegetable garden bed. They attract pollinators and predatory insects, deter various pests through volatile compounds and root exudates, and support overall garden biodiversity. Space plants every 3 feet throughout beds for maximum nematode suppression.

Question 6

Do French marigolds attract snails?

Accepted Answer

Yes, snails love French marigolds, making them excellent trap crops. Regularly check marigold plants for snails, remove with stem attached, and dispose in chicken yard or elsewhere. This protects surrounding vegetables by concentrating snails on sacrificial marigold plants.

Question 7

How do French marigolds repel pests?

Accepted Answer

French marigolds use multiple mechanisms: volatile chemicals in foliage confuse or repel insects seeking plants by smell, root exudates suppress nematode egg hatching, distinctive odor deters certain pests, and they act as trap crops attracting pests away from vegetables.

Question 8

What pests do French marigolds NOT deter?

Accepted Answer

French marigolds do NOT deter snails—snails actually love them. They work better as trap crops for snails rather than repellents. While they deter root-knot nematodes, slugs, and hornworms effectively, they attract snails which must be manually removed regularly.

Question 9

Are French marigolds easy to grow?

Accepted Answer

Yes, French marigolds are incredibly easy to grow and maintain. They're resilient in various conditions, available in numerous varieties, produce bushy foliage with cheerful blooms, require minimal care, propagate easily from cuttings, and self-seed readily for continuous supply.

Question 10

Do French marigolds have medicinal uses?

Accepted Answer

Yes, French marigold blossoms contain flavonoids (patuletin, quercetagetin, quercetin) that help protect against oxidative stress and offer anticancer properties when used as infusion tea. However, consult qualified healthcare providers before using any herbal medicinals for safety.

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