Tagetes tenuifolia
Tagetes tenuifolia
Signet marigold
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Taxonomy
Family Asteraceae · Genus Tagetes
Common Names
Signet marigoldGolden marigoldLemon marigold
Context
nativeRegion
Mexico and Central America
usdaZones
2–11 (grown as annual everywhere)
companionPlants
Tomatoes, Beans, Peppers, Cucumbers
culturalUses
Traditional in companion planting for pest control; flowers used for ornamental and edible purposes; used in folk medicine.
Care
Care Requirements
LightFull sun; tolerates partial shade but flowers best with abundant sunlight.
WateringModerate watering; allow soil to dry slightly between waterings. Drought tolerant once established.
SoilWell-drained, loamy or sandy soil; not too rich. Avoid waterlogged conditions.
FertilizerMinimal fertilizer needed; overfertilization reduces flowering. Use a balanced, diluted feed sparingly.
HumidityAdaptable to a range of humidity levels; prefers moderate humidity.
TemperatureThrives in warm temperatures, 18-30°C (65-86°F); frost sensitive.
Growth & Life Cycle
HabitAnnual herb with bushy, finely divided foliage and prolific small flowers.
Mature Size20–45 cm high and wide (8–18 inches).
Growth RateFast growing, especially in suitable conditions.
BloomingBlooms profusely in summer to early fall, often continuously until frost.
DormancyNo dormant phase; completes lifecycle within a year.
Propagation
MethodsSeeds
DifficultyVery easy
Best SeasonSpring (after last frost)
Maintenance & Notes
PruningDeadhead spent flowers to encourage continuous blooming.
RepottingRepotting unnecessary; best grown as an annual outdoors.
Pests & DiseasesGenerally pest resistant; watch for aphids or spider mites. Susceptible to root rot if overwatered.
ToxicityNon-toxic to humans and pets.
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