How to Grow Nemesia 'KLM'

Nemesia 'KLM'

Nemesia strumosa 'KLM'

flower

A compact annual flowering plant prized for its striking bicolor blooms in blue, white, and red hues resembling the flag of the Netherlands (hence the name 'KLM'). This cultivar produces abundant snapdragon-like flowers from spring through summer with a bushy, mounding habit. It's excellent for containers, borders, and hanging baskets, bringing vibrant color to cool-season gardens.

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Example Nemesia 'KLM' timeline · Pittsburgh, PA (Zone 6b)

Plant Nemesia 'KLM'
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
First Nemesia 'KLM' blooms
Around Jun 6

≈ 50 days after planting

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

Growing Conditions

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Sun: Full sun to partial shade, 6+ hours of direct sunlight daily (partial shade in hot climates)

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Water: Keep soil consistently moist but not waterlogged; water regularly, especially during dry spells. Prefers moisture; drought stress causes early flowering decline. In containers, water more frequently.

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Spacing: 8-12 inches

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Days to maturity: 50-70 days from transplant to first blooms

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Planting depth: Surface sow; seeds need light to germinate—do not cover or barely press into soil

Soil

Type: Well-draining loamy soil rich in organic matter

pH: 6.0-7.0

Amendments:

Compost Peat moss Perlite for drainage

Growing Zones

Find your zone →

Thrives in zones 3-8; prefers cooler climates

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

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Growth Stages

Seed and Germination

1-2 weeks

Seeds are tiny and require light exposure; germination occurs in 7-14 days at cool temperatures (65-70°F)

Start indoors 6-8 weeks before last frost. Do not bury seeds. Keep soil moist and warm but provide bright light. Use seed-starting mix.

Seedling

2-3 weeks

Develops first true leaves; plants are small and delicate with thin stems

Provide bright light to prevent legginess. Keep soil evenly moist. Maintain cool temperatures (60-70°F). Begin very dilute liquid fertilizer at half-strength.

Vegetative Growth

3-4 weeks

Plant establishes branching structure, foliage thickens, bushy mound develops

Harden off gradually before transplanting outdoors. Pinch back growing tips at 4-6 inches to encourage branching and bushiness. Space appropriately.

Flowering

8-12 weeks

Abundant bicolor blooms in blue, white, and red appear at branch tips; continuous flowering in cool weather

Deadhead spent flowers regularly to extend bloom season. Maintain consistent moisture and cool temperatures. Feed every 2 weeks with balanced or bloom-boosting fertilizer.

Decline/End of Season

Variable with climate

Flowering slows as temperatures warm; plant becomes leggy and produces fewer blooms

In hot climates (above 85°F consistently), expect earlier decline. Provide afternoon shade. Cut back if energetic regrowth begins in fall as temperatures cool.

Companion Planting

Plan your garden →

Plant with:

Violas Pansies Snapdragons Calendula Dusty Miller Alyssum Lobelia Diascia

Avoid planting near:

Tall heat-loving plants that shade and create warm microclimates Plants with aggressive spreading habit that compete for resources

Common Pests

Spray with insecticidal soap or neem oil; use sticky traps; ensure good air circulation
Wash off with strong water spray; apply insecticidal soap or neem oil; encourage beneficial insects
Improve air circulation; avoid overhead watering; apply sulfur fungicide or neem oil at first sign
Increase humidity; spray with water; apply miticide or neem oil if severe

Uses

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Edible flowers

Culinary

Nemesia flowers are mildly edible with a slightly sweet, peppery flavor and are food-safe for garnishing desserts, salads, and beverages when grown without pesticides. [source]

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Cut flower arrangements

Household

The striking bicolor blooms last well in water (5-7 days) and create vibrant, unusual cut flower displays or floral designs. [source]

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Container and garden design

Craft

Its mounding, compact habit and distinctive tricolor blooms make it ideal for mixed container plantings, hanging baskets, window boxes, and cool-season bedding displays. [source]

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Pollinator attraction

Wildlife

The bright flowers attract bees, butterflies, and other pollinators, supporting garden ecosystems. [source]

Harvest Tips

Nemesia 'KLM' is grown for ornamental flowers rather than harvest. Deadhead flowers regularly (removing spent blooms) to encourage continuous flowering throughout the season. Cut stems for fresh arrangements when blooms are fully open.

Fun Facts

🌱 The cultivar name 'KLM' references Royal Dutch Airlines (Koninklijke Luchtvaart Maatschappij) because the bicolor flowers perfectly match the airline's iconic blue, white, and red livery.
🌱 Nemesia flowers have specialized lip-like petals that guide pollinating insects to the nectar; the flower shape is similar to snapdragons despite being unrelated botanically.
🌱 Unlike most annuals, Nemesia actually prefers cooler temperatures and often slows or stops blooming in peak summer heat, performing best in spring and fall gardens or high-altitude locations.

Gardening Terms

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

Annual Cultivar Deadhead Full Sun Germination Partial Shade Pinch Back Transplant True Leaves

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