Heirloom

Lemon Gem

Tagetes tenuifolia

Photo: Dguendel · Wikimedia Commons · (CC BY 3.0)

Hundreds of petite, citrus-scented flowers cover neat, low mounds of lacy foliage. Long-blooming for beds, borders and containers where it attracts beneficial insects such as hoverflies. Leaves of the plant are edible and are used as flavorful salad greens and garnish. Also known as signet marigold.Edible Flowers: Use the flowers to dress up salads and desserts or cooked in egg or rice dishes. Flavor is floral with hints of citrus and spice, and slightly bitter. Remove the petals from the flower base before consuming as the base can be quite bitter.

Harvest

60d

Days to harvest

📅

Sun

Full sun

☀️

Zones

2–11

USDA hardiness

🗺️

Height

8-30 inches

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Start Indoors

Transplant

Direct Sow

Showing dates for Lemon Gem in USDA Zone 7

All Zone 7 flower →

Zone Map

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Lemon Gem · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-18 inches

SoilWell-draining soil; tolerates average fertility

WaterModerate; drought tolerant once established

SeasonWarm season annual

FlavorFloral with hints of citrus and spice, slightly bitter base.

ColorGolden yellow with orange tones

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	April – May	June – July	June – August	—
Zone 4	March – April	June – June	June – July	—
Zone 5	March – April	May – June	May – July	—
Zone 6	March – April	May – June	May – July	—
Zone 7	February – March	April – May	April – June	—
Zone 8	February – March	April – May	April – June	—
Zone 9	January – February	March – April	March – May	—
Zone 10	January – January	February – March	February – April	—
Zone 1	May – June	July – August	July – September	—
Zone 2	April – May	June – July	June – August	—
Zone 11	January – January	January – February	January – March	—
Zone 12	January – January	January – February	January – March	—
Zone 13	January – January	January – February	January – March	—

Succession Planting

Lemon Gem blooms continuously from first flower until frost kills it — it doesn't exhaust itself the way a lettuce or radish does, so a single sowing covers the whole season. That said, if you want staggered coverage across multiple beds, start a tray indoors in February, then direct sow a second batch outdoors in April once soil temps reach 60°F. You'll have transplant-ready plants going in early and a second wave of seedlings coming up 6–8 weeks behind them, useful insurance if a late spring storm flattens the first flush. Beyond that two-wave approach, one good planting is enough.

Complete Growing Guide

Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist, Occasionally Dry. Height: 0 ft. 8 in. - 2 ft. 6 in.. Spread: 0 ft. 9 in. - 2 ft. 6 in.. Spacing: Less than 12 inches, 12 inches-3 feet. Growth rate: Medium. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Tufted seeds

Color: Black. Type: Achene.

Harvest time: Fall

Edibility: The flowers of some cultivars have a pleasant citrus-like flavour and can be used sparingly as a flavouring or as a garnish.

Storage & Preservation

Fresh Lemon Gem flowers are best stored in the refrigerator at 35-40°F with moderate humidity, placed loosely in a breathable container or paper towel-lined box to prevent moisture buildup. They'll keep for 3-5 days when refrigerated. For preservation, dry flowers by hanging bundles upside down in a cool, dark, well-ventilated space for 1-2 weeks, then store in airtight containers away from light. Alternatively, freeze individual petals in ice cube trays with water for decorative use in beverages, or infuse petals into honey or herbal tea for extended storage up to several months.

History & Origin

Origin: Mexico, Central America, Columbia, Peru

Advantages

+Attracts: Bees, Butterflies, Songbirds
+Edible: The flowers of some cultivars have a pleasant citrus-like flavour and can be used sparingly as a flavouring or as a garnish.
+Low maintenance

Considerations

-Toxic (Flowers, Roots, Sap/Juice): Low severity
-Causes contact dermatitis

Companion Plants

Lemon Gem pulls its weight in the vegetable garden mostly by confusing pests before they land. Planted as a border around tomatoes and peppers, the citrus-scented foliage masks the host-plant odors that aphids and whiteflies use to zero in on their targets. Tagetes tenuifolia produces terpene compounds in its leaves and stems — not just the roots, the way French marigolds (T. patula) suppress nematodes — so the above-ground interference is genuinely stronger with this species than with the big pom-pom types. In our zone 7 Georgia garden, I run a row along the south edge of the tomato beds starting in late April; they're blooming by late June right when whitefly pressure picks up. Basil alongside it compounds the effect: stacking aromatic plants makes it that much harder for pests to lock onto a single scent signature.

Beans and cabbage are the two to keep in separate beds. Some allelopathic suppression has been observed between legumes and Tagetes — the mechanism isn't fully pinned down, but bush beans in particular seem to stunt marigold growth enough that the pairing isn't worth it. Cabbage family crops (Brassica oleracea and relatives) pull in their own pest guild — cabbage loopers, imported cabbageworms — that you don't want anywhere near the flowers you're running as a pest-confusion border.

Plant Together

Basil

Repels aphids, whiteflies, and thrips that commonly attack marigolds

Tomatoes

Marigolds repel nematodes and tomato hornworms while improving tomato flavor

Peppers

Marigolds deter aphids and flea beetles that damage pepper plants

Nasturtiums

Both attract beneficial insects and serve as trap crops for aphids

Zinnias

Create pollinator habitat together and have similar growing requirements

Cucumbers

Marigolds repel cucumber beetles and squash bugs

Lettuce

Provides ground cover while marigolds deter aphids and leaf miners

Roses

Marigolds repel aphids, nematodes, and may reduce black spot disease

Keep Apart

Beans

Marigolds can inhibit bean growth and nitrogen fixation through root secretions

Cabbage

Marigold compounds may stunt brassica growth and development

Sunflowers

Compete for similar nutrients and sunflowers may shade out lower-growing marigolds

Pests & Disease Resistance

Common Pests

Spider mites, aphids, whiteflies

Diseases

Powdery mildew, root rot if overwatered

Troubleshooting Lemon Gem

What you'll see, why it happens, and what to do about it.

Fine webbing on undersides of leaves, foliage looking dusty or stippled, plants losing vigor in hot dry stretches

Likely Causes

Two-spotted spider mite (Tetranychus urticae) — thrives when temps push above 85°F and humidity drops
Overhead watering skipped too long during summer drought

What to Do

1.Blast the undersides of leaves with a strong stream of water three days in a row — it physically knocks mite populations down fast
2.Apply insecticidal soap or neem oil in the early morning (not midday — you'll burn the foliage)
3.Keep plants spaced at least 12 inches apart so air moves through; crowded plants stress faster and mites spread quicker

White powdery coating on upper leaf surfaces, starting on older inner leaves, usually appearing in late summer

Likely Causes

Powdery mildew (Golovinomyces cichoracearum or related species) — common when nights cool below 65°F but days stay warm, typically August into September
Poor airflow from dense planting or proximity to a fence or wall

What to Do

1.Remove and trash (don't compost) affected leaves as soon as you see the coating — slows spread considerably
2.Spray with a diluted baking soda solution (1 tablespoon per gallon of water) or a potassium bicarbonate product weekly
3.At end of season, pull and dispose of the whole plant — don't leave infected material to overwinter in the bed

Frequently Asked Questions

How long does it take for Lemon Gem to bloom?▼

Lemon Gem typically takes 60 days from sowing to first flower. It's a long-blooming variety that produces flowers continuously throughout the growing season once it starts blooming, providing weeks of colorful blooms in beds, borders, and containers.

Is Lemon Gem marigold good for beginners?▼

Yes, absolutely. Lemon Gem is rated as easy to grow, making it ideal for beginner gardeners. It's forgiving with care, tolerates various conditions, and requires minimal maintenance. It's also drought-tolerant once established and doesn't demand constant attention, perfect for novice growers.

Can you grow Lemon Gem in containers?▼

Yes, Lemon Gem thrives in containers. Its neat, low mounding habit makes it perfect for pots, window boxes, and hanging baskets. Ensure well-draining soil and containers with drainage holes. Container growing also makes it convenient for harvesting edible flowers and leaves regularly.

What does Lemon Gem taste like?▼

The flowers have a floral flavor with hints of citrus and spice, with a slightly bitter finish. The petals are most palatable; remove the base before consuming as it's quite bitter. The edible foliage has a citrus-scented, peppery taste that works well in salads and as garnish.

When should I plant Lemon Gem seeds?▼

Sow Lemon Gem seeds after the last frost date when soil has warmed, or start seeds indoors 6-8 weeks before your last spring frost. It loves full sun (6+ hours daily) and performs best in warm-season conditions. Direct sowing outdoors is also effective once frost danger passes.

How does Lemon Gem attract beneficial insects?▼

The abundant small citrus-scented flowers attract hoverflies and other beneficial insects, making it excellent for pollinator gardens and integrated pest management. These insects help control garden pests naturally, supporting an overall healthier ecosystem while the plant provides continuous nectar and pollen.