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Vinca Madagascar Mix

Catharanthus roseus 'Madagascar Mix'

These heat-loving beauties thrive in scorching summer conditions where other flowers fail, producing a continuous display of five-petaled blooms in pink, white, and rose with contrasting eyes. Also known as Madagascar periwinkle, they're incredibly drought-tolerant once established and maintain their neat, compact habit without deadheading. Perfect for hot, sunny spots and low-maintenance gardens.

Harvest

N/Ad

Days to harvest

📅

Sun

kath-ah-RAN-thus RO-zee-us

☀️

Zones

10–11

USDA hardiness

🗺️

Height

6-18 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 Vinca Madagascar Mix in USDA Zone 7

All Zone 7 flower →

Zone Map

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Vinca Madagascar Mix · Zones 10–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing8-12 inches

SoilWell-draining soil, tolerates poor conditions

pH6.0-7.5

WaterLow to moderate, drought tolerant once established

SeasonWarm season annual

FlavorN/A - toxic if ingested

ColorMixed: pink, white, rose, often with contrasting centers

Size1.5-2 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: kath-ah-RAN-thus RO-zee-us. Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0). Drainage: Good Drainage, Moist. Height: 0 ft. 6 in. - 1 ft. 6 in.. Spread: 0 ft. 8 in. - 1 ft. 0 in.. Spacing: Less than 12 inches. Growth rate: Rapid. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

fruits long, slender, often paired. Elongate follicles within one persisting calyx.

Type: Follicle.

Bloom time: Fall, Summer

Storage & Preservation

Since Vinca Madagascar Mix is toxic and not suitable for consumption, traditional food preservation methods do not apply. However, you can preserve these flowers for craft purposes through careful drying.

For pressing flowers, select newly opened blooms in mid-morning after dew has evaporated. Place flowers between absorbent paper in a flower press or heavy book, ensuring petals don't overlap. The thin petals typically dry within 2-3 weeks and retain much of their color.

For three-dimensional preservation, try silica gel drying. Bury fresh blooms completely in silica gel crystals in an airtight container for 3-5 days. This method preserves the flower's shape better than pressing but requires more care in handling.

Seed collection is possible from non-hybrid varieties, but Madagascar Mix is a hybrid strain, so saved seeds won't come true to type. Always handle dried plant material with care and store away from children and pets, as toxicity remains even after drying.

History & Origin

Origin: Madagascar

Advantages

+Attracts: Butterflies, Pollinators
+Fast-growing
+Low maintenance

Considerations

-Toxic (Flowers, Fruits, Leaves, Roots, Seeds, Stems): Low severity

Companion Plants

Plant Together

Marigolds

Repel nematodes and aphids while attracting beneficial insects

Petunias

Repel aphids, tomato hornworms, and other pests naturally

Nasturtiums

Act as trap crops for aphids and cucumber beetles

Sweet Alyssum

Attracts beneficial insects like lacewings and parasitic wasps

Dusty Miller

Provides contrasting foliage texture and color without competing for nutrients

Begonias

Share similar growing conditions and complement flowering periods

Coleus

Provides shade tolerance and colorful foliage contrast in mixed plantings

Zinnia

Attracts pollinators and beneficial predatory insects

Keep Apart

Impatiens

Competes for water and nutrients, may harbor similar fungal diseases

Black Walnut Trees

Produce juglone toxin which inhibits growth of many flowering plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby 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 in proper conditions

Common Pests

Spider mites in dry conditions, aphids

Diseases

Root rot in wet soils, leaf spot in humid conditions

Frequently Asked Questions

How long does Vinca Madagascar Mix take to bloom from seed?▼

Vinca Madagascar Mix typically takes 18-20 weeks from seed sowing to first blooms. Start seeds indoors 12-14 weeks before your last frost, then allow 6-8 weeks after transplanting for flowering to begin. The slow germination (2-3 weeks) and gradual establishment make this one of the longest seed-to-bloom annuals, but the wait is worthwhile for their exceptional heat tolerance.

Can you grow Vinca Madagascar Mix in containers?▼

Yes, Vinca Madagascar Mix performs excellently in containers, often better than in garden beds since you can control drainage perfectly. Use containers at least 8 inches deep with multiple drainage holes. Choose terra cotta or light-colored pots to prevent overheating roots. Water when the top inch of potting mix feels dry, typically every 2-3 days in hot weather.

Is Vinca Madagascar Mix poisonous to dogs and cats?▼

Yes, all parts of Vinca Madagascar Mix are toxic to dogs, cats, and humans if ingested. The plant contains alkaloids that can cause vomiting, diarrhea, and more serious symptoms. While the bitter taste usually deters pets from eating large quantities, it's important to supervise pets around these plants and seek veterinary care if ingestion occurs.

When should I plant Vinca Madagascar Mix outdoors?▼

Plant Vinca Madagascar Mix outdoors only after soil temperatures reach 65°F and nighttime temperatures consistently stay above 60°F. This is typically 2-3 weeks after your last frost date. Planting too early in cool, wet conditions will cause root rot or plant death. Wait until the weather is genuinely warm and settled.

Why are my Vinca Madagascar Mix leaves turning yellow?▼

Yellow leaves on vinca usually indicate overwatering or poor drainage. These plants prefer to dry out between waterings once established. Check that containers have adequate drainage holes and garden beds don't hold standing water. Cool, wet conditions and consistently moist soil are the primary causes of yellowing foliage and eventual plant decline.

Do I need to deadhead Vinca Madagascar Mix flowers?▼

No, Vinca Madagascar Mix is self-cleaning and doesn't require deadheading. Spent blooms drop naturally without forming unsightly seed heads or reducing flowering. In fact, excessive handling or pinching can stress these plants and potentially introduce diseases. Simply let them grow naturally for best performance.