Red Gem

Family: Asteraceae Flower

Warm, jewel-bright blooms arrive in profusion—Red Gem’s compact signet marigold flowers glow in rich ember-red with a softly ruffled, lacy look.

The foliage is fine and feathery, creating a delicate texture that feels almost filigreed in the garden, while the blossoms carry a lively, aromatic character that gardeners love to enjoy fresh. Ideal for borders and containers, Red Gem shines as a pollinator magnet in heat, delivering steady color from early summer through fall.

Light: Full SunMaturity: 60 DaysHabit: Bush

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Jun 20th
Harvest Begins	Aug 19th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Bush
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	7

Culinary Notes

Chef's Note

Signet marigold petals bring a spicy, aromatic sparkle—use them like you’d use a pinch of toasted spice, not like a big leafy herb. Finely chopped or used at the end, they keep their personality without turning the whole dish medicinal.

Best Uses

sparingly as a bright edible garnish for salads and rice bowls
chop fine into herb-y butter to perfume warm bread
use as a flower-speckled finishing crunch on tacos or grilled proteins

Flavor Profile

peppery-woody aromatic bite citrusy, slightly herbal lift lacy petals with a delicate, thin crunch

Kitchen Pairings

lime black pepper garlic butter white rice chicken or pork

Frequently Asked Questions

What’s the most common pest or disease problem for Tagetes tenuifolia (Red Gem), and what should I do?

A frequent issue is spider mites and aphids showing up during warm, dry spells, causing stippled or curled foliage. Rinse plants with a strong water spray, then apply insecticidal soap (especially the undersides) every 5–7 days until you stop seeing new damage. If you notice leaf spots spreading or bud rot, remove affected leaves and avoid overhead watering to keep foliage dry.

How often should I water Tagetes tenuifolia while it’s growing, and what soil moisture level is best?

During the main growth phase (from establishment through blooming), water when the top 1 inch of soil feels dry, typically every 2–4 days in full sun depending on heat. Aim for evenly moist soil but never waterlogged conditions; Tagetes tenuifolia performs best in well-drained soil where excess water can drain quickly. For container plants, check daily in hot weather because the top layer dries fast.

How can I tell when Red Gem (Tagetes tenuifolia) is ready to harvest?

Harvest when plants reach about 60 days and the tiny, bright blooms are fully open and actively producing—avoid picking buds that haven’t opened yet. For continuous harvest, snip flowers in the morning and remove dead or spent blooms to encourage more flowering. If the foliage starts to look sparse and flowering slows, prioritize frequent harvesting of open blooms rather than letting them sit.