How to Grow Dipladenia Scarlett Pimpernel

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Dipladenia Scarlett Pimpernel

Mandevilla sanderi 'Scarlett Pimpernel'

vine

Dipladenia Scarlett Pimpernel is a tropical flowering vine prized for its vibrant scarlet-red blooms and glossy green foliage. This vigorous climber produces abundant clusters of funnel-shaped flowers throughout the growing season, making it an excellent choice for trellises, arbors, and container gardens. It thrives in warm conditions and can reach 6-10 feet in length when properly supported.

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Example Dipladenia Scarlett Pimpernel timeline · Pittsburgh, PA (Zone 6b)

Plant Dipladenia Scarlett Pimpernel
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Dipladenia Scarlett Pimpernel
Around Jun 16

≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Dipladenia Scarlett Pimpernel dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily for best flowering; tolerates partial shade in hot climates

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Water: Keep soil consistently moist but not waterlogged during growing season; reduce watering in winter. Water at soil level to prevent fungal issues on foliage. In containers, check soil moisture regularly as they dry faster.

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Spacing: 24 inches

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Days to maturity: 60-90 days to first flowering; continuous blooms with proper care

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Planting depth: Same depth as root ball; plant transplants at soil surface

Soil

Type: Well-draining, fertile loamy soil

pH: 6.0-6.5

Amendments:

Peat moss Perlite Compost Orchid bark for container growing

Growing Zones

Find your zone →

Thrives in USDA zones 10-11; grow as an annual or houseplant in cooler zones

10a 10b 11a 11b

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Growth Stages

Establishment

2-4 weeks

Young vine with tender growth and minimal foliage; appears delicate and sparse

Provide sturdy support structure early; keep soil consistently moist without waterlogging; shield from strong winds and harsh direct sun if newly planted; fertilize lightly every 2 weeks

Vegetative Growth

4-8 weeks

Vigorous stem elongation with increasing leaf production; glossy green foliage fills in along the vine

Tie stems to support structure as they grow; prune tips to encourage branching and bushier growth; maintain regular fertilization with balanced fertilizer; water consistently

Bud Formation

2-3 weeks

Small flower buds appear along stems and branch tips; plant shows readiness to bloom

Switch to phosphorus-rich fertilizer to encourage flowering; maintain consistent watering and humidity; ensure 6+ hours of direct sunlight daily; reduce nitrogen fertilizer

Flowering

8-12 weeks (repeating with deadheading)

Abundant scarlet-red funnel-shaped flowers appear in clusters; flowers measure 2-3 inches across

Deadhead spent blooms to encourage continuous flowering; maintain even moisture and warmth (70-80°F ideal); fertilize every 2 weeks with bloom-promoting formula; provide consistent support as vine becomes heavier

Winter Dormancy

3-4 months

Growth slows significantly; flowering decreases; foliage may yellow slightly

Reduce watering but don't let soil dry completely; move indoors in zones below 10 or provide frost protection; stop fertilizing; prune back leggy growth in late winter before spring growth resumes

Companion Planting

Plan your garden →

Plant with:

Clematis Jasmine Bougainvillea Tropical hibiscus Passion flower Morning glory

Avoid planting near:

Black walnut (allelopathic effects) Fennel (allelopathic effects) Heavy shade-producing trees

Common Pests

Spray with neem oil or insecticidal soap; increase humidity; rinse foliage with water; repeat every 7-10 days as needed
Remove with cotton swab dipped in rubbing alcohol; apply insecticidal soap; isolate affected plants; spray neem oil weekly for 3-4 weeks
Use yellow sticky traps; spray with insecticidal soap or neem oil; improve air circulation; treat every 5-7 days for persistent infestations
Scrape off manually with soft brush; apply horticultural oil; use neem oil spray; repeat treatments every 10-14 days
Improve air circulation around plant; avoid overhead watering; apply sulfur dust or potassium bicarbonate fungicide; remove affected leaves; maintain 50-70% humidity

Uses

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Vertical Garden Feature

Ornamental

Dipladenia Scarlett Pimpernel is an excellent choice for creating dramatic vertical interest on trellises, pergolas, arbors, and walls with its continuous cascade of brilliant scarlet blooms. The dense foliage and prolific flowering make it ideal for screening and creating living walls in tropical and subtropical gardens. [source]

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Container & Patio Gardening

Household

Perfect for container growing on patios, balconies, and terraces, especially in cooler climates where it can be grown as an annual or brought indoors for winter. Its vining habit makes it suitable for hanging baskets, window boxes, and large pots with appropriate support structures. [source]

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Pollinator Attraction

Wildlife

The abundant scarlet flowers attract hummingbirds, butterflies, and other pollinators, making it valuable for wildlife gardens. The nectar-rich blooms provide excellent food sources for beneficial insects throughout the growing season. [source]

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Living Garden Architecture

Craft

Use Dipladenia Scarlett Pimpernel to train along decorative frameworks, create living walls, or develop espalier effects for unique garden design. The flexibility of the vine allows for creative training and shaping into custom forms. [source]

Harvest Tips

This ornamental vine is not harvested for food or material; however, deadhead spent flowers regularly to encourage continuous blooming throughout the season. Cut back stems by one-third in late winter to maintain shape and encourage bushier growth. Remove any dead or diseased wood year-round.

Fun Facts

🌱 Dipladenia was renamed Mandevilla in 1840 to honor the British diplomat Henry Mandeville who facilitated the plant's introduction to Europe from South America.
🌱 The name 'Scarlett Pimpernel' references the classic novel and its mysterious hero, reflecting the plant's dramatic red coloring and somewhat exotic nature.
🌱 In tropical climates, Dipladenia can flower year-round with proper care, producing hundreds of blooms per season on a single established vine.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Partial Shade pH Trellis

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