Lemon Gem

Family: Asteraceae Flowering annual

Planting Schedule

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Sunlit, lemony blooms open like tiny fireworks—warm butter-yellow petals with a crisp, fragrant snap that carries a bright citrus note.

Lemon Gem’s delicate, feathery texture makes it a standout in beds and borders, while its signet-size flowers are especially prized for fresh garnishing and vivid color in salads, desserts, and floral accents. Grow it for a long, cheerful show that also supports pollinators with its steady stream of sunny blossoms.

Light: Full SunMaturity: 50 DaysHabit: Clumping

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Lemon Gem Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	May 4th	Jun 1st	Jul 21st – Aug 1st
Zone 2a	Apr 27th	May 25th	Jul 14th – Aug 29th
Zone 2b	Apr 17th	May 15th	Jul 4th – Aug 25th
Zone 3a	Apr 17th	May 15th	Jul 4th – Sep 1st
Zone 3b	Apr 21st	May 19th	Jul 8th – Sep 21st
Zone 4a	Apr 17th	May 15th	Jul 4th – Sep 24th
Zone 4b	Apr 15th	May 13th	Jul 2nd – Sep 27th
Zone 5a	Apr 10th	May 8th	Jun 27th – Sep 30th
Zone 5b	Apr 6th	May 4th	Jun 23rd – Oct 5th
Zone 6a	Apr 3rd	May 1st	Jun 20th – Oct 10th
Zone 6b	Mar 28th	Apr 25th	Jun 14th – Oct 16th
Zone 7a	Mar 23rd	Apr 20th	Jun 9th – Oct 20th
Zone 7b	Mar 13th	Apr 10th	May 30th – Oct 28th
Zone 8a	Mar 4th	Apr 1st	May 21st – Nov 5th
Zone 8b	Feb 23rd	Mar 23rd	May 12th – Nov 12th
Zone 9a	Feb 6th	Mar 6th	Apr 25th – Nov 26th
Zone 9b	Jan 12th	Feb 9th	Mar 31st – Dec 9th
Zone 10a	—	Oct 1st	Nov 20th – Feb 28th
Zone 10b	—	Oct 1st	Nov 20th – Feb 28th
Zone 11a	—	Oct 1st	Nov 20th – Feb 28th
Zone 11b	—	Oct 1st	Nov 20th – Feb 28th
Zone 12a	—	Oct 1st	Nov 20th – Feb 28th
Zone 12b	—	Oct 1st	Nov 20th – Feb 28th
Zone 13a	—	Oct 1st	Nov 20th – Feb 28th
Zone 13b	—	Oct 1st	Nov 20th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	50
Sun Requirements	Full Sun
Growth Habit	Clumping
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	50
Min Night Temp (°F)	32
Harden Off (days)	7

Culinary Notes

Chef's Note

Even as a flower, this signet marigold eats like a little edible confetti—bright citrus first, then a crisp petal snap and a warm, buttered perfume. Use it fresh at the last second so the petals stay lively, not soggy.

Best Uses

fresh garnish for cocktails and citrusy drinks—adds flavor without wilting
scatter into salads where the petals can stay crisp
stir into softened butter or honey for a quick lemon-marigold glaze
top desserts like panna cotta or cheesecake for a vivid, fragrant hit

Flavor Profile

bright lemon-citrus brightness crisp, delicate petal snap buttery warm marigold perfume slightly peppery aromatic finish

Kitchen Pairings

lemon zest olive oil honey butter vanilla white chocolate

Frequently Asked Questions

What pest or disease most commonly affects Tagetes tenuifolia (Lemon Gem), and how do I treat it at home?

The most common issue is leaf-damaging aphids and whiteflies, which cluster on tender growth and can cause sticky honeydew. Spray plants with a strong jet of water, then follow with insecticidal soap (especially underside of leaves) every 4–7 days until activity stops. If you see gray-brown fungal spots, remove affected leaves and avoid overhead watering to keep foliage dry.

How often should I water Lemon Gem (Tagetes tenuifolia) during the main growing phase?

During active growth, keep the soil consistently lightly moist but never soggy—water when the top 1 inch of soil feels dry. Water at the base early in the day and aim to wet the root zone thoroughly, then let excess drain so the crown doesn’t stay wet. In hot weather, this often becomes about 2–3 waterings per week, but always adjust to your soil and rainfall.

How can I tell when Lemon Gem is ready to harvest at about 50 days?

Harvest readiness is usually when plants are producing plenty of small, fragrant flowers and the foliage is well-developed—typically around 50 days from germination. For the best flavor and aroma, pick blooms in the morning after the dew dries, before the heat softens scent and texture. If grown for edible flowers/foliage, harvest regularly to encourage more blooming rather than waiting for full seed maturity.