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Ingredient

Marigold (Tagetes)

Tagetes patula

Also known as: French marigold, Tagetes patula, Mexican marigold, Tagetes erecta, Tagetes minuta

Annual flowering plant — the right ingredient for nematode suppression and general pest deterrence in vegetable beds and orchards. *Tagetes patula* (French marigold) and *T. minuta* (Mexican marigold) produce α-terthienyl and other thiophene compounds that suppress root-knot nematodes (*Meloidogyne* spp.); a season-long marigold cover or interplant reduces nematode populations measurably. Also: the strong pungent foliage deters whiteflies, thrips, and some leaf-feeding insects (the deterrent effect is real but weaker than the nematode effect). Flowers are edible; petals are a saffron substitute. Fast from seed, frost-tender, drought-tolerant once established.

Inputs / outputs

  • Seeding: direct-sow after last frost or transplant; small seeds, easy
  • Density for nematode effect: dense planting required — solid stand for full season, not interplanted with crop, gives best suppression
  • Soil: any well-drained
  • Sun: full sun
  • Habit: T. patula 12–18 in; T. erecta 18–36 in; T. minuta 4–7 ft
  • Bloom: continuous from June to frost

Solves / unlocks

  • Root-knot nematode suppression (best effect: full-season solid marigold cover the year before a susceptible crop)
  • Whitefly and thrip deterrence (mild) when interplanted
  • Edible-flower garnish, dye source, [[saffron|saffron]] substitute
  • Pollinator attractor (small bees, hover flies)
  • Continuous color in vegetable beds (visual marker for inter-bed pathways)

Constraints

  • Nematode suppression effect requires density and duration — scattered marigolds in a bed don’t deliver the effect.
  • Variety matters — T. patula and T. minuta are most studied; ornamental hybrids (Inca, Antigua) may have less of the active compounds.
  • Companion-planting effect is overstated in popular gardening literature — the pest-deterrent effect is real but modest; don’t substitute for sound pest management.
  • Frost-tender annual.

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

  • Parallels: [[nasturtium]]
  • Member of: [[ingredient]]
  • Combines with: [[companion-planting]]

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