Heirloom

Cosmos Sensation Mix

Cosmos bipinnatus 'Sensation Mix'

An old-fashioned favorite that epitomizes cottage garden charm with its delicate, papery petals in soft pastels and feathery foliage. This easy-care annual self-sows readily and blooms continuously until frost, attracting beneficial insects and providing armloads of cut flowers. The tall, graceful stems sway beautifully in the breeze, adding movement and romance to any garden space.

Sun

KAHS-mos bye-pin-NAY-tus

☀️

Zones

2–11

USDA hardiness

🗺️

Height

2-4 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 Cosmos Sensation Mix in USDA Zone 7

All Zone 7 flower →

Zone Map

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Cosmos Sensation Mix · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Very Easy

Spacing12-18 inches

SoilPoor to average soil, avoid rich soil

pH6.0-8.5

WaterLow to moderate, drought tolerant

SeasonWarm season annual

FlavorN/A - Ornamental

ColorMix of white, pink, rose, and crimson

Size3-4 inch diameter flowers

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	—

Complete Growing Guide

Light: KAHS-mos bye-pin-NAY-tus. Soil: Clay, Loam (Silt), Sand. Soil pH: Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Occasionally Dry. Height: 2 ft. 0 in. - 4 ft. 0 in.. Spread: 2 ft. 0 in. - 3 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Rapid. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Type: Capsule.

Bloom time: 'Antiquity', 'Candy Stripe' Mix, 'Chocolate', 'Cosmic' Series, 'Daydream', 'Early Wonder', 'Gazebo' Mix, 'Picotee', 'Psyche Mix', 'Purity', 'Seashells' Mix, 'Sensation' Series, 'Sonata' Series, 'Versailles' Series

Storage & Preservation

Fresh cosmos flowers last longest when stored as cut stems in clean, cool water. Change water every 2-3 days and trim stem ends to maintain uptake. They'll keep 5-7 days at room temperature, slightly longer in a cool spot away from direct sunlight.

For edible flowers, harvest individual blooms and use immediately, or store petals between damp paper towels in the refrigerator for up to 2 days. For preservation, cosmos dry beautifully for winter arrangements—hang small bunches upside down in a dry, dark space with good air circulation. They'll maintain their color and papery texture for months.

Seed saving is perhaps the most valuable preservation method. Allow some flowers to go to seed naturally, then collect the dark, elongated seeds once flower heads are completely dry. Store in paper envelopes in a cool, dry place—these seeds remain viable for 3-4 years and often produce interesting color variations.

History & Origin

Origin: Mexico and southwest North America

Advantages

+Disease resistance: Deer, Drought, Dry Soil, Heat, Poor Soil
+Attracts: Attractive Flowers, Attracts Pollinators, Colorful, Easy to Grow
+Wildlife value: Attracts pollinators, birds and butterflies.
+Fast-growing
+Low maintenance

Companion Plants

Plant Together

Marigolds

Repel aphids and other pests while attracting beneficial insects

Zinnias

Attract pollinators and beneficial predatory insects, similar growing conditions

Nasturtiums

Act as trap crops for aphids and attract beneficial predators

Sunflowers

Provide beneficial insect habitat and attract pollinators

Sweet Alyssum

Attracts hover flies and parasitic wasps that control aphids

Lavender

Repels moths and other pests while attracting beneficial pollinators

Dill

Attracts beneficial insects like lacewings and parasitic wasps

Coreopsis

Similar care requirements and attracts beneficial insects

Keep Apart

Black Walnut

Produces juglone which is toxic to many plants including cosmos

Large Tomatoes

Create excessive shade that reduces cosmos flowering and growth

Fennel

Allelopathic properties can inhibit growth of nearby flowering plants

Nutrition Facts

Calories

15kcal(1%)

Protein

1.03g(2%)

Carbs

3.28g(1%)

Fat

0.07g(0%)

Vitamin C

28mg(31%)

Vitamin A

97mcg(11%)

Iron

0.7mg(4%)

Calcium

39mg(3%)

Potassium

173mg(4%)

Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #169270)

Pests & Disease Resistance

Resistance

Excellent disease resistance

Common Pests

Aphids, thrips, occasional grasshoppers

Diseases

Powdery mildew in humid conditions, bacterial wilt

Frequently Asked Questions

How long does Cosmos Sensation Mix take to bloom from seed?▼

Cosmos Sensation Mix blooms remarkably quickly, typically flowering 70-80 days from seed. When direct sown after the last frost, expect first blooms by midsummer. The key is warm soil for germination—cold, wet conditions can delay flowering by 2-3 weeks. Once they start blooming, they continue non-stop until frost.

Can you grow Cosmos Sensation Mix in containers?▼

Yes, but choose large containers (at least 12 inches wide and deep) to accommodate their 3-4 foot height and spreading root system. Use regular potting mix—avoid rich, moisture-retaining soils that cause weak, floppy growth. Container plants may need light staking and will require more frequent watering than ground-planted cosmos, though still much less than most annuals.

Is Cosmos Sensation Mix good for beginning gardeners?▼

Absolutely—this is one of the most foolproof annuals for beginners. Cosmos actually perform better with neglect than intensive care. The biggest mistake new gardeners make is over-fertilizing and overwatering. Simply scatter seeds in a sunny spot with average soil, and they'll take care of themselves while providing months of colorful blooms.

When should I plant Cosmos Sensation Mix seeds?▼

Direct sow seeds 2-3 weeks after your last frost date when soil temperature reaches 60°F consistently. In most areas, this means late May to early June. For earlier blooms in short-season areas, start indoors 4-5 weeks before the last frost, but direct sowing produces stronger plants that are better adapted to your local conditions.

Do Cosmos Sensation Mix flowers come back every year?▼

While cosmos are annuals that die with frost, Sensation Mix self-sows prolifically in most climates. You'll likely find volunteer seedlings the following spring, often in slightly different locations than where you originally planted. This natural reseeding creates beautiful, informal drifts that many gardeners prefer to formal plantings.

What's the difference between Cosmos Sensation Mix and other cosmos varieties?▼

Sensation Mix features larger flowers (3-4 inches) on taller, sturdier stems compared to older varieties, making it superior for cutting. Unlike dwarf cosmos, Sensation maintains the classic cottage garden height of 3-4 feet. The color range is more refined than newer hybrids, sticking to traditional pastels—white, pink, rose, and crimson—rather than bold oranges or unusual bi-colors.