Heirloom

Benary's Giant Golden Yellow

Zinnia elegans

Photo: L.L. May & Co; Henry G. Gilbert Nursery and Seed Trade Catalog Collection · Wikimedia Commons · (No restrictions)

Benary's Giant Golden Yellow is a vibrant heirloom flower variety prized for its large, double blooms in rich golden yellow. Reaching maturity in 75-90 days, this ornamental produces abundant flowers ideal for cutting and garden displays. The generous, fully double petals create full, pompom-like blooms that stand out among standard varieties. Best grown in full sun with well-draining soil enriched with organic matter, this easy-to-grow heirloom thrives in warm conditions and attracts pollinators while resisting common pests effectively.

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 Benary's Giant Golden Yellow in USDA Zone 7

All Zone 7 flower →

Zone Map

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Benary's Giant Golden Yellow · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing18-24 inches

SoilWell-draining, organic-matter-rich soil

WaterRegular, consistent moisture; drought tolerant once established but performs best with reliable watering

SeasonWarm season annual

ColorGolden yellow

Size4-6"

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

Direct sow every 3 weeks from April through mid-June in zone 7. Germination takes 7-10 days in soil above 60°F, and plants hit bloom around 75-90 days from seed, so a mid-June sowing will push flowers into September. Stop once daytime highs are consistently above 90°F — germination rates drop off sharply and seedlings struggle to establish in that kind of heat.

If you're cutting regularly (every 3-4 days at full bloom), each plant keeps producing for months, so succession matters less here than with a crop like cilantro that shuts down fast. The main reason to stagger sowings is to avoid one giant flush followed by a gap — keep cutting, keep sowing, and you'll have stems from June through first frost.

Complete Growing Guide

Recommended by the Association of Specialty Cut Flower Growers. High yields of long, sturdy stems with 4-6" fully double, dahlia-like blooms. Excellent vase life. Vigorous plants hold up well in summer heat and rain. Low susceptibility to powdery mildew. Cut-and-come-again flower, yielding multiple cuts over the season. According to Johnny's Selected Seeds, Benary's Giant Golden Yellow is 75 - 90 days to maturity, annual, open pollinated. Notable features: Use for Cut Flowers and Bouquets, Attracts Beneficial Insects.

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

Benary's Giant Golden Yellow reaches harvest at 75 - 90 days from sowing per Johnny's Selected Seeds. Expect 4-6" at peak. As an annual, harvest continues until frost ends the season.

Type: Achene.

Storage & Preservation

Fresh-cut stems last 10-14 days in a clean vase with floral preservative changed every 2-3 days. Keep in a cool location (60-65°F) away from ripening fruit, which releases ethylene gas that shortens vase life. For preservation, dry whole flower heads in a dark, well-ventilated space at 50-60°F with 30-40% humidity—they dry completely in 2-3 weeks and hold color beautifully for dried arrangements lasting 6+ months. Alternatively, freeze individual petals in ice cube trays with water for decorative use in beverages or desserts. Press flowers between parchment paper under heavy books for 2-3 weeks to create lasting specimens for crafts or herbals.

History & Origin

Benary's Giant Golden Yellow 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

+Produces long, sturdy stems ideal for professional cut flower arrangements
+Fully double dahlia-like blooms reach impressive 4-6 inches in size
+Excellent vase life extends the value of each cut flower
+Vigorous plants thrive in summer heat and heavy rain
+Cut-and-come-again habit yields multiple harvests throughout the season

Considerations

-Requires 75-90 days to flower, extending time to first harvest
-Large blooms may need staking or support in windy conditions
-Golden yellow color has limited use in certain floral design palettes

Companion Plants

Sweet alyssum planted at the base draws in parasitic wasps and hoverflies that will work through an aphid infestation without any help from you. Marigolds — French types especially, like 'Petite Gold' — add nematode suppression through root secretions, which matters if you're rotating this bed with edibles. Fennel is allelopathic to a wide range of annuals and will stunt zinnias within a couple of feet; keep it on the other side of the garden. Black walnut is a harder stop — juglone moves through the soil far enough that zinnias planted under or near the canopy typically just fail, no obvious cause, no recovery.

Plant Together

Marigolds

Repel nematodes and aphids while attracting beneficial insects

Nasturtiums

Act as trap crops for aphids and cucumber beetles, protecting zinnias

Basil

Repels thrips, aphids, and spider mites that commonly attack zinnias

Cosmos

Attract beneficial pollinators and predatory insects while providing similar growing conditions

Sunflowers

Provide beneficial shade and attract pollinators, complement yellow color scheme

Petunias

Repel aphids, tomato hornworms, and other pests while adding color contrast

Lavender

Repels moths, fleas, and mosquitoes while attracting beneficial pollinators

Sweet Alyssum

Attracts beneficial insects like lacewings and hover flies that control aphids

Keep Apart

Black Walnut Trees

Release juglone toxin that inhibits growth and can kill zinnias

Fennel

Produces allelopathic compounds that inhibit growth of nearby flowering plants

Eucalyptus

Releases allelopathic chemicals that suppress growth of most garden flowers

Pests & Disease Resistance

Common Pests

Aphids, spider mites, thrips

Diseases

Powdery mildew (low susceptibility), root rot in poorly drained soil

Troubleshooting Benary's Giant Golden Yellow

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

White powdery coating on upper leaf surfaces, usually appearing mid-summer when nights cool down

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — airborne fungal spores thrive in warm days and cool, humid nights
Crowded spacing that restricts airflow between plants

What to Do

1.Space plants at least 18 inches apart from the start — you can't fix crowding after the fact
2.Remove and bag the worst-affected leaves; don't compost them
3.Apply a diluted neem oil spray (2 tbsp per gallon) every 7 days until symptoms stop spreading

Stems collapsing at the soil line on young seedlings or new transplants, often after a stretch of wet weather

Likely Causes

Root rot from Pythium or Phytophthora — both thrive in waterlogged, poorly drained soil
Overwatering seedlings in trays before roots are established

What to Do

1.Don't plant zinnias in low spots where water pools after rain — they'll die every time
2.If growing in containers or trays, confirm drainage holes are actually draining before each watering
3.Pull the collapsed plants entirely; they won't recover, and leaving them creates a reservoir of pathogen

Stippled, bronze-looking foliage with fine webbing on the undersides of leaves during hot, dry spells

Likely Causes

Two-spotted spider mite (Tetranychus urticae) — populations explode in temperatures above 85°F with low humidity
Dusty conditions, which mites prefer over clean, moist foliage

What to Do

1.Knock mites off with a strong stream of water from a hose, hitting the leaf undersides directly
2.Apply insecticidal soap (1% solution) every 5-7 days for 2-3 cycles — coverage on the underside is what matters
3.Keep plants consistently watered; drought-stressed zinnias are far more vulnerable to mite damage than well-irrigated ones

Distorted, curled new growth or buds that fail to open properly, sometimes with sticky residue on stems

Likely Causes

Aphid colonies (commonly Myzus persicae or Aphis gossypii) clustered at the growing tips
Thrips (Frankliniella occidentalis) feeding inside developing buds before they open

What to Do

1.Check the tips and undersides of new growth first — that's where both pests concentrate
2.Squash small aphid colonies by hand or knock them off with water; for larger infestations, apply neem oil or insecticidal soap
3.For thrips inside buds, remove and trash the affected buds — sprays can't reach them once they're tucked inside

Frequently Asked Questions

How long does Benary's Giant Golden Yellow take to flower?▼

From seed to first blooms takes 75-90 days. If you start indoors 6-8 weeks before your last frost and transplant after frost danger, you'll typically see flowers 6-8 weeks after moving plants outside. Flowering continues until frost, with peak production in mid to late summer.

Is Benary's Giant Golden Yellow good for beginners?▼

Yes—it's rated as Easy and the Association of Specialty Cut Flower Growers endorses it for commercial use, meaning it's forgiving in most conditions. Seeds germinate reliably, seedlings grow vigorously, and plants tolerate heat and rain well. Your main task is consistent watering and deadheading to keep blooms coming.

Can I grow Benary's Giant Golden Yellow in containers?▼

Yes, but with care. Use 5-gallon pots minimum and very well-draining potting mix enriched with compost. Container plants dry faster and are more prone to stress; water daily in hot weather and fertilize every 2 weeks. Expect slightly shorter stems than in-ground plants and more frequent deadheading to prevent soil-borne disease.

What makes Benary's Giant Golden Yellow different from other cut-flower varieties?▼

Its combination of professional-grade characteristics—large fully double blooms, long sturdy stems, exceptional vase life, natural disease resistance, and reliable productivity—in an easy-to-grow annual package sets it apart. Most competitors require either more care (disease management, staking) or produce smaller flowers on shorter stems.

When should I plant Benary's Giant Golden Yellow seeds?▼

Start indoors 6-8 weeks before your last spring frost. Direct sow outdoors after all frost danger has passed and soil warms to 60°F+. In warm climates (zones 8-10), you can also plant in late summer for fall blooms, though spring planting gives the longest productive season.

Why did my Benary's Giant Golden Yellow stop blooming mid-summer?▼

The most common cause is letting flowers mature and set seed—the plant then redirects energy into seed production and stops blooming. Harvest flowers when fully open but before they begin to fade. Also check watering consistency: stress from drought or erratic watering shuts down flowering. Finally, ensure 6+ hours of direct sun daily, as shade triggers rapid shutdown.