How to Grow Nemesia Joan Wilder

Nemesia Joan Wilder

Nemesia strumosa 'Joan Wilder'

flower

Joan Wilder is a vibrant cultivar of nemesia featuring striking bicolored blooms in shades of pink, orange, and coral with contrasting throat markings. This compact, mounding annual produces abundant cheerful flowers from spring through fall in cool climates. Known for its extended blooming period and low-maintenance nature, it's an excellent choice for containers, borders, and mixed plantings.

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Example Nemesia Joan Wilder timeline · Pittsburgh, PA (Zone 6b)

Plant Nemesia Joan Wilder
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
First Nemesia Joan Wilder blooms
Around Jun 6

≈ 50 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Nemesia Joan Wilder dates for your own zip code.

Growing Conditions

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Sun: Full sun to partial shade; 6-8 hours of direct sunlight daily; afternoon shade beneficial in hot climates

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Water: Keep soil consistently moist but not waterlogged; water at soil level to prevent powdery mildew; reduce watering if temperatures exceed 80°F as heat stress causes blooming to diminish

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Spacing: 8-12 inches

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Days to maturity: 50-70 days from seed to first flowers

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Planting depth: Barely cover seeds (1/8 inch); seeds need light to germinate

Soil

Type: Well-draining loamy soil with moderate fertility

pH: 6.0-7.0

Amendments:

Compost or aged bark for drainage improvement Perlite or coarse sand for heavy clay soils Balanced slow-release fertilizer at planting

Growing Zones

Find your zone →

Thrives in zones 2-9; performs best in cooler regions (zones 4-8); in warmer zones, treat as cool-season annual

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

Seed germination

7-14 days

Tiny seeds are light-dependent and remain on soil surface; cotyledons emerge within 7-14 days at 65-70°F

Keep soil consistently moist but not waterlogged; provide bright, indirect light; maintain warm temperatures; do not cover seeds

Seedling

2-3 weeks

True leaves emerge; plants develop first 2-4 true leaves and reach 1-2 inches tall

Provide bright light to prevent leggy growth; maintain 65-70°F; thin crowded seedlings; keep soil moist; begin light fertilization when second set of true leaves appears

Vegetative growth

3-4 weeks

Plants establish root system and develop bushy mounding form with multiple stems; foliage is dense and lime-green

Pinch growing tips at 3-4 inches to encourage branching; fertilize every 2-3 weeks with balanced fertilizer; maintain consistent moisture; harden off before transplanting outdoors

Flowering

6-12 weeks or longer in cool seasons

Abundant bicolored snapdragon-like flowers appear on branch tips in coral, pink, and orange tones with contrasting throats; flowers are 1-1.5 inches across

Deadhead spent flowers to encourage continuous blooming; reduce water slightly if temperatures exceed 80°F; provide afternoon shade in hot climates; fertilize weekly with balanced or slightly lower-nitrogen fertilizer

Decline/seed set (late season)

Variable; continues until frost or heat stress

In hot weather or after first frost, flowering diminishes; seed pods develop if flowers aren't deadheaded

Either deadhead to extend blooming or allow seed pods to mature for self-seeding next year; reduce water if letting plants decline; discontinue fertilizing

Companion Planting

Plan your garden →

Plant with:

Diascia Bacopa Calibrachoa Sweet alyssum Verbena Dusty miller Licorice plant Argyranthemum Salvia

Avoid planting near:

Plants requiring dry, well-drained conditions (sedums, drought-tolerant plants) Plants sensitive to consistent moisture (bearded iris, artemisia)

Common Pests

Spray undersides of leaves with insecticidal soap; use reflective mulches; introduce parasitic wasps; insecticidal neem oil as needed
Spray with strong water stream; apply insecticidal soap; use neem oil; encourage natural predators like ladybugs
Improve air circulation; water at soil level, not overhead; avoid wetting foliage; apply sulfur dust or fungicide early; reduce humidity
Increase humidity and water frequency; spray with insecticidal soap; apply neem oil; introduce predatory mites

Uses

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Edible flowers

Culinary

Nemesia flowers are edible with a slightly spicy, peppery flavor and can garnish salads, desserts, and beverages for visual appeal and a unique taste dimension. [source]

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Container gardening

Household

The compact mounding habit and prolific blooms make Joan Wilder ideal for hanging baskets, window boxes, and mixed containers, providing season-long color with minimal maintenance. [source]

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Fresh cut flowers

Craft

Stems with multiple flowers make attractive additions to fresh flower arrangements and last 5-7 days in a vase when harvested in morning and placed in water immediately. [source]

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Pollinator attraction

Wildlife

The bright, nectar-rich flowers attract bees, butterflies, and hoverflies, supporting pollinator populations in gardens and contributing to ecosystem health. [source]

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Traditional ornamental remedy

Medicinal

While not widely used medicinally, nemesia has been employed in traditional herbalism; research into alkaloid compounds in Nemesia strumosa suggests potential antimicrobial properties. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Nemesia Joan Wilder is grown for ornamental flowers rather than harvest. Deadhead spent blooms regularly—pinching off faded flowers just below the calyx—to encourage continuous flowering throughout the season. Cutting stems for fresh arrangements also promotes bushier growth and more blooms. If collecting seeds for next year, stop deadheading in late season and allow seed pods to mature and dry on the plant.

Fun Facts

🌱 Joan Wilder is named after a fictional character from the 1985 film 'Jewel of the Nile,' reflecting the flower's precious, jewel-like quality with its bright bicolored blooms.
🌱 Nemesia flowers have a unique snapdragon-like structure but belong to a different family (Scrophulariaceae) and are native to South Africa, where they thrive in cool mountain climates.
🌱 The flowers remain closed on cloudy days and at night, a behavior called nyctinasty, which protects pollen and prevents water loss in cool, moist conditions.

Gardening Terms

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

Annual Cultivar Deadhead Full Sun Partial Shade Transplant True Leaves

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