French Marigold

Asteraceae

The MOST-RESEARCHED companion plant in existence. Extensive peer-reviewed literature on nematode suppression (alpha-terthienyl). Compact (6-12 inches), blooms 50-60 days from seed continuously until frost. CRITICAL NUANCE: casual interplanting does NOT suppress nematodes — requires dense cover-crop-density monoculture for full season, then rotation to vegetables. For mixed plantings, value is pollinator attraction and scent-based pest deterrence.

At a Glance

Days to Maturity

50–60 days

Sun

6+ hours

Container

Yes

Height

0.5–1 ft

Zone Planting Guide

Your USDA Zone:

Growing Guide

Germination

Germination Time 5–7 days

Optimal Temp 72°F

Seed Depth 0.25"

Watering

Needs Moderate

Resilience

Heat: Medium Cold: Low Drought: Medium

Nutrition

Feeding Intensity Light feeder

Harvest

Flowers fully open

Sources

peer-reviewed UF/IFAS Extension (EDIS) — Marigolds (Tagetes spp.) for Nematode Management seed_catalog Burpee — Learn about Marigold

More Flowers

French Marigold Planting Dates by Zone

Planting dates for French Marigold vary by USDA hardiness zone. Select your zone below for frost dates, start-indoors timing, and a full monthly planting calendar.

Zone 5A Zone 5B Zone 6A Zone 6B Zone 7A Zone 7B Zone 8A Zone 8B Zone 9A Zone 9B

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