Heirloom

Oklahoma Carmine

Zinnia elegans

Wikimedia Commons via Zinnia elegans

Harvest

75-90d

Days to harvest

📅

Sun

Full sun

☀️

Zones

2–11

USDA hardiness

🗺️

Height

0-3 feet

📏

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 Oklahoma Carmine in USDA Zone 7

All Zone 7 flower →

Zone Map

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Oklahoma Carmine · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

ColorViolet

Size1 1/2-2 1/2"

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

Oklahoma Carmine is a warm-season annual that cuts and comes back, so a single sowing keeps producing through frost — but staggered sowings extend your peak-quality bloom window considerably. Direct sow every 3 weeks from April through mid-June in zone 7; stop once daytime highs are consistently above 90°F, since germination drops off sharply in hot soil and seedlings started in that heat rarely catch up. Indoors, start as early as February and transplant out in late April after your last frost date.

For cut-flower production specifically, a second sowing in late May gives you a flush of fresh stems in August and September, right when earlier plants start looking woody and spent. When you harvest or deadhead, cut back to a lateral bud — don't just snap off the flower head — and the plant will branch and rebloom for another 3 to 4 weeks before it finally gives out.

Complete Growing Guide

Prolific 1 1/2-2 1/2" double and semidouble petite, yet sturdy violet-colored blooms. Excellent, reliable accent flowers for market bouquets, wedding flowers, and event work. Cut-and-come-again flower, yielding multiple cuts over the season. According to Johnny's Selected Seeds, Oklahoma Carmine is 75 - 90 days to maturity, annual, open pollinated. Notable features: Grows Well in Containers, Use for Cut Flowers and Bouquets.

Light: Full sun (6 or more hours of direct sunlight a day). Soil: High Organic Matter, Loam (Silt). Soil pH: Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Occasionally Dry. Height: 0 ft. 6 in. - 3 ft. 0 in.. Spread: 0 ft. 8 in. - 1 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Rapid. Maintenance: Medium. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Oklahoma Carmine reaches harvest at 75 - 90 days from sowing per Johnny's Selected Seeds. Expect 1 1/2-2 1/2" at peak. As an annual, harvest continues until frost ends the season.

Type: Achene.

Storage & Preservation

Store fresh Oklahoma Carmine blooms in a cool refrigerator (35-40°F) with high humidity (95%+) immediately after cutting. They'll last 7-10 days when properly hydrated. For longer-term preservation, try air-drying bunches upside-down in a dark, well-ventilated space for dried arrangements (2-3 weeks). Alternatively, press individual blooms between parchment paper under heavy weight for 1-2 weeks to preserve them for crafts or herbals. Glycerin preservation (stem in 1:1 water-glycerin solution for 2-3 weeks) creates supple, long-lasting specimens ideal for arrangements.

History & Origin

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

Origin: Mexico

Advantages

+Violet blooms are distinctive and desirable for premium floral arrangements
+Prolific cut-and-come-again production yields multiple harvests per plant
+Petite 1.5-2.5 inch doubles suit tight bouquets and wedding work
+Reliable performer requires minimal effort even for inexperienced growers
+Sturdy stems hold up well during processing and arranging

Considerations

-Violet color limits versatility in color-coordinated wedding schemes
-Shorter bloom season of 75-90 days reduces overall production window
-Semidouble forms occasionally revert to single flowers mid-season
-Susceptible to powdery mildew in humid greenhouse conditions

Companion Plants

Marigolds and nasturtiums are the most practical neighbors for Oklahoma Carmine. French marigold varieties like 'Petite Gold' release thiophenes from their roots that suppress soil nematodes, and nasturtiums act as a trap crop for aphids — drawing them onto stems you can just cut off and discard rather than spraying the zinnias themselves. Alyssum fills the ground-level gaps, pulling in parasitic wasps and hoverflies that keep whitefly numbers down. None of these compete hard for root space, which matters when you're planting densely for cut-flower production.

Black walnut, eucalyptus, and fennel are the ones to avoid. Black walnut leaches juglone from its roots and fallen debris — enough to visibly stunt or kill zinnias planted within its drip zone. Fennel is a quieter troublemaker: its root exudates slow the growth of nearby annuals, and it tends to push away the pollinators and beneficial insects you want working your zinnia patch all season.

Plant Together

Marigolds

Repel nematodes and aphids while attracting beneficial insects

Nasturtiums

Act as trap crops for aphids and cucumber beetles, protecting nearby plants

Alyssum

Attracts beneficial insects like lacewings and parasitic wasps for natural pest control

Zinnias

Attract pollinators and beneficial predatory insects while providing complementary colors

Cosmos

Attract beneficial insects and provide structural diversity without competing for nutrients

Lavender

Repels moths, fleas, and mosquitoes while attracting pollinators

Catmint

Deters ants, aphids, and rodents while attracting beneficial pollinators

Sunflowers

Provide natural support structure and attract beneficial birds for pest control

Keep Apart

Black Walnut Trees

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

Eucalyptus

Produces allelopathic compounds that suppress growth of nearby plants

Fennel

Inhibits growth of most garden plants through allelopathic root secretions

Troubleshooting Oklahoma Carmine

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

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

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — a fungal infection that spreads by airspores, not splash
Crowded spacing that restricts airflow between plants

What to Do

1.Cut out the worst-affected stems at the base and bin them — don't compost
2.Space plants at least 12 inches apart at transplant to keep air moving
3.Apply a diluted neem oil spray (2 tbsp per gallon of water) every 7 days if the infection is still spreading

Seedlings collapse at the soil line within the first 2 weeks of germination, stems look pinched and dark at the base

Likely Causes

Damping off — typically Pythium or Rhizoctonia fungi thriving in cold, waterlogged soil
Overwatering or starting seeds in trays with no bottom drainage

What to Do

1.Start over with fresh, sterile seed-starting mix — don't reuse last season's trays without sterilizing them first
2.Water from the bottom and let the top of the mix dry slightly between waterings
3.Don't start indoors more than 4–6 weeks before your last frost; Oklahoma Carmine transplants fine and doesn't need a long head start

Ragged holes chewed in petals and leaves, mostly overnight, with no visible insects during the day

Likely Causes

Japanese beetles (Popillia japonica) — peak feeding June through August, often gregarious on open blooms
Earwigs (Forficula auricularia) — feed at night, hide in mulch or debris during the day

What to Do

1.Hand-pick Japanese beetles in the morning when they're sluggish and drop them into soapy water
2.Pull any thick mulch back 6 inches from the stem base to reduce earwig harborage
3.Set a damp rolled-newspaper trap near the bed overnight — earwigs congregate in it; toss it in the trash by morning

Frequently Asked Questions

How long do Oklahoma Carmine cut flowers last in a vase?▼

Oklahoma Carmine blooms typically last 7-10 days in a vase when properly cared for. Keep them in cool water (35-40°F), change water every 2-3 days, trim stems at an angle, and remove lower foliage. Their sturdy petals and reliable nature make them longer-lasting than many delicate ornamental flowers, making them excellent for wedding and event arrangements.

Is Oklahoma Carmine a good flower for beginners?▼

Yes, absolutely. Oklahoma Carmine is rated as an easy-to-grow heirloom variety with reliable, prolific blooms. It thrives in full sun with minimal fussing and produces multiple cuts throughout the season (cut-and-come-again). Perfect for first-time flower growers or commercial florists seeking dependable, consistent production with minimal pest or disease issues.

Can you grow Oklahoma Carmine in containers?▼

Yes, Oklahoma Carmine can be grown in containers. Use well-draining potting soil and ensure pots are at least 6-8 inches deep. Place in full sun (6+ hours daily) and water regularly. Container growing works well for small-space gardeners and market growers, though in-ground planting often yields slightly more vigorous, prolific blooms due to deeper root systems.

When should I plant Oklahoma Carmine flowers?▼

Plant Oklahoma Carmine after your last frost date in spring. They require full sun and reach harvest maturity in 75-90 days. For continuous blooms, succession plant every 2-3 weeks. In mild climates, fall planting also works well. Start seeds indoors 6-8 weeks before transplanting outdoors, or direct sow after frost danger passes.

Why choose Oklahoma Carmine for wedding flowers?▼

Oklahoma Carmine is specifically praised for wedding and event work. Its double and semidouble violet petals are petite yet sturdy, creating elegant 1.5-2.5 inch blooms perfect for bouquets and arrangements. The reliable, prolific production and cut-and-come-again nature ensure consistent, high-quality flowers throughout the season for professional florists.