Lemon Gem

Marigold

Zone 9b Save Garden

🌱 50d to harvest Clumping

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

Crop Dates

Milestone	Date
Start Indoors	Jan 12th
Last Frost	Feb 9th
Transplant / Sow Outdoors	Feb 9th
Harvest Begins	Mar 31st
Harvest Ends	Dec 9th

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

Recommended Companions

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.

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.

Sowing Tips

Transplant Conditions

Wait until soil reaches 50°F and nights stay above 32°F before moving outdoors. Harden off for 7 days first.

Expert Note

Sow lightly, keep evenly moist until emergence, then transplant (or thin if direct-sown) after cold nights pass for nonstop edging blooms.