Heirloom

Orange Flash

Calendula officinalis

Photo: EyeTrick · Wikimedia Commons · (CC BY 4.0)

Harvest

50-55d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

2–11

USDA hardiness

🗺️

Height

12-24 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 Orange Flash in USDA Zone 7

All Zone 7 flower →

Zone Map

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Orange Flash · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

FlavorTangy and slightly bitter with a complex taste suitable for both savory and sweet dishes.

ColorBronze center with peach and cream hints

Size1 1/2-3"

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
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	—
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	—

Succession Planting

Direct sow every 3 weeks starting when soil temperatures reach 60°F, through early summer — in zone 7, that's roughly April 1 through mid-June. Each succession gives you a fresh flush of blooms about 50–55 days out, which lines up well if you're cutting for market or CSA shares. Stop sowing once daytime highs are consistently hitting 85°F; seeds sown into summer heat germinate poorly and the resulting plants tend to stall before they flower.

For a fall crop, resow in late August to early September. Calendula handles light frost well — down to about 25°F — so a fall planting in zone 7 can carry you into November before it gives up.

Complete Growing Guide

1 1/2-3" blooms have a bronze center with some hints of peach and cream. Uniform plants. Timing, color, and performance are very comparable to Triangle Flashback. Edible Flowers: Petals of the flowers can be used fresh or dried in "flower confetti," soups, soufflés, rice dishes, baked goods, and to garnish desserts. Calendula is a popular choice for brightening up salad mix. Flavor is tangy and slightly bitter. Remove the petals from the flower base before consuming as the base can be quite bitter. According to Johnny's Selected Seeds, Orange Flash is 50 - 55 days to maturity, annual, open pollinated. Notable features: Cold Tolerant, Grows Well in Containers, Use for Cut Flowers and Bouquets, Edible Flowers, Attracts Beneficial Insects.

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 2 ft. 0 in.. Spread: 1 ft. 0 in. - 2 ft. 0 in.. Maintenance: Medium. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Orange Flash reaches harvest at 50 - 55 days from sowing per Johnny's Selected Seeds. Expect 1 1/2-3" at peak. As an annual, harvest continues until frost ends the season.

Seeds ripe from August to November.

Type: Achene.

Harvest time: Fall

Edibility: Flower petals give color to soups, custards, and rice; also used in cookies, vinegars.

Storage & Preservation

Fresh calendula petals can be stored in a breathable container in the refrigerator at 35-40°F for 3-5 days; keep humidity moderate to prevent wilting. For longer preservation, air-dry petals in a cool, dark, well-ventilated space (ideal temperature 60-70°F) for 1-2 weeks, then store in airtight containers away from light. Alternatively, freeze petals in ice cube trays with water for culinary use, lasting 2-3 months. You can also infuse petals into honey or vinegar for extended shelf life and added flavor complexity.

History & Origin

Orange Flash is open-pollinated, meaning seed saved from healthy plants will produce true-to-type offspring. Listed in the Johnny's Selected Seeds catalog.

Origin: Mediterranean

Advantages

+Blooms in just 50-55 days from seed to flower
+Uniform plant growth makes spacing and planning easier
+Edible petals add tangy flavor and visual appeal to dishes
+Bronze-peach-cream color rivals Triangle Flashback with better performance

Considerations

-Petals require careful removal to avoid bitter flower base taste
-Calendula attracts spider mites and powdery mildew in humid conditions

Companion Plants

Sweet alyssum is probably the most useful neighbor here — its tiny flowers run at ground level and draw in parasitic wasps and hoverflies that prey on aphids, which calendula attracts reliably. Nasturtiums work as a trap crop, pulling aphids toward themselves and away from your calendula bed. That sounds backward until you realize you'd rather manage one sacrificial planting than pick aphids off 30 orange flowers. Catmint and lavender add pollinator traffic without root competition — both stay relatively shallow, which means they're not fighting calendula for the same water.

Fennel is the one to avoid planting anywhere nearby. It releases allelopathic compounds through both its roots and decomposing leaf litter that suppress growth in a wide range of annuals — NC State Extension flags it as a poor neighbor for most annual beds, not just calendula. Black walnut causes a different but equally real problem: juglone, a root exudate that builds up in the soil and is toxic to many plants at concentrations that persist even after the tree is gone.

Plant Together

Marigolds

Repel nematodes, aphids, and whiteflies while attracting beneficial insects

Nasturtiums

Act as trap crops for aphids and cucumber beetles, provide ground cover

Sweet Alyssum

Attracts beneficial insects like hoverflies and parasitic wasps for pest control

Petunias

Repel aphids, tomato hornworms, and other garden pests naturally

Zinnia

Attracts pollinators and beneficial predatory insects while providing color contrast

Cosmos

Attracts beneficial insects and provides structural support without competing for nutrients

Catmint

Repels ants, aphids, and rodents while attracting beneficial pollinators

Lavender

Deters pests with aromatic oils and attracts beneficial pollinators like bees

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive flowering plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby plants

Fennel

Produces chemicals that inhibit germination and growth of most flowering companions

Troubleshooting Orange Flash

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

White powdery coating on leaves and stems, usually showing up mid-summer when nights cool down

Likely Causes

Powdery mildew (Golovinomyces cichoracearum) — the most common calendula fungal problem, favored by warm days and cool, humid nights
Poor airflow from crowded planting

What to Do

1.Remove and bag the worst-affected leaves — don't compost them
2.Spray with a diluted potassium bicarbonate solution (1 tablespoon per gallon of water) every 7 days until symptoms stop spreading
3.Give plants at least 12 inches of space next time; this fungus thrives where air sits still

Flower buds forming but failing to open, or opening with distorted, crinkled petals

Likely Causes

Thrips (Frankliniella occidentalis) feeding inside developing buds before they open
Aphid colonies on new growth diverting plant energy

What to Do

1.Tap a bud over a white sheet of paper — if tiny, fast-moving specks fall out, you have thrips; treat with spinosad spray at dusk to protect pollinators
2.Check stem tips for aphid clusters and knock them off with a firm stream of water, or apply insecticidal soap directly to colonies
3.Deadhead any already-distorted blooms so the plant redirects energy to clean buds

Leaves developing small, dark brown to black spots with yellow halos, starting on lower growth

Likely Causes

Alternaria leaf spot (Alternaria calendulae) — a fungal pathogen that splashes up from soil during rain or overhead watering
Overhead irrigation keeping foliage wet for extended periods

What to Do

1.Strip affected lower leaves and dispose of them in the trash, not the compost pile
2.Switch to drip or base watering — foliage that stays wet more than a few hours a day is the main driver here
3.Apply a copper-based fungicide every 10 days if the infection keeps spreading

Plant stops producing flowers entirely in mid-summer despite looking otherwise healthy

Likely Causes

Heat stress — Orange Flash slows or halts bloom production when daytime temperatures consistently exceed 85–90°F
Plant has been allowed to set seed on spent blooms, signaling it to stop producing

What to Do

1.Deadhead every 2–3 days; a calendula that's setting seed thinks its job is done and acts accordingly
2.If temperatures are above 90°F for more than a week straight, cut plants back by one-third and mulch the root zone — they'll often rebound once temperatures drop below 80°F
3.In hot climates, plan a late-summer resow (direct sow in late August) to get a fall flush of flowers

Frequently Asked Questions

How long do Orange Flash calendula petals last after harvesting?▼

Fresh petals keep for 3-5 days refrigerated in a breathable container. For longer storage, air-dry them in a cool, dark place for 1-2 weeks and store in airtight containers; they'll remain viable for several months. Freezing petals in ice cube trays extends shelf life to 2-3 months.

Is Orange Flash calendula good for beginning gardeners?▼

Yes, Orange Flash is an excellent choice for beginners. It's classified as easy to grow, requires only 4-6+ hours of sun, tolerates both full sun and partial shade, and matures in just 50-55 days. The uniform plant habit and reliable performance make it very forgiving for new growers.

Can you grow Orange Flash calendula in containers?▼

Yes, calendula performs well in containers. Use a well-draining potting mix and ensure adequate light (4-6+ hours). Container-grown plants may need more frequent watering than in-ground varieties, so monitor soil moisture regularly. Containers also allow easy deadheading to encourage continuous blooms throughout the season.

What does Orange Flash calendula taste like?▼

The petals have a tangy and slightly bitter flavor profile. They work well in soups, salads, rice dishes, and baked goods where their taste adds complexity. Always remove petals from the flower base before eating, as the base is quite bitter and unpalatable.

When should I plant Orange Flash calendula seeds?▼

Direct sow seeds after the last frost date once soil temperatures are warm. For earlier blooms, start seeds indoors 6-8 weeks before your last spring frost. Seeds typically germinate in 7-14 days under proper conditions with consistent moisture.

How do you use Orange Flash calendula in cooking?▼

Use fresh or dried petals in flower confetti, soups, soufflés, rice dishes, and baked goods. Calendula is popular for brightening salad mixes and garnishing desserts. The petals add both visual appeal and a tangy-bitter note. Always remove the base before consuming to avoid the undesirable bitter taste.