Lobelia Erinus Riviera Midnight Blue

Lobelia Erinus Riviera Midnight Blue Seeds

(Compact Mounded Edging Lobelia — Deep Navy Blue with White Eye, Extra-Early)

Riviera Midnight Blue is a frost-tolerant, cool-season thriver, covered in dainty dark blue blooms with white eyes and bronze foliage. Its delicate texture and profuse flowers make it a welcome addition to rock garden beds, borders, containers, baskets, or garden beds.
The compact habit makes for a great splash of color in flower beds and mixed combinations. The extra early-flowering series blooms about 15 days earlier than standard varieties, with ball-shaped plants that stay compact and mounded, perfect for beds, borders, containers, and color bowls.

The “Midnight Blue” color descriptor is meaningful and precise — this is not simply a deep blue but a blue with genuine darkness, depth, and a slight violet-navy quality that evokes the color of the sky at dusk. The compact upright lobelia features an early blooming season, providing a rich tapestry of midnight-blue blossoms, standing at a height of 5 inches and a width of 8 inches.
Within the complete lobelia collection available here, Midnight Blue provides the darkest, most intense blue — anchoring the low end of the blue spectrum as Regatta Sky Blue anchors the light end. This contrast makes the two varieties particularly effective as companions in mixed plantings: the pale sky blue and the deep midnight blue create a tonal depth and range in a blue-themed display that a single shade cannot achieve alone.

Mounds of delicate deep blue flowers provide a great accent in shade arrangements — the deep, saturated midnight blue is particularly effective in shaded or partially shaded positions where lighter colors can appear washed out. The intensity and depth of the flower color hold well in lower light conditions, maintaining visual impact where paler varieties may lose presence.

Riviera Midnight Blue — Color Comparison within the Lobelia Collection

The lobelia collection now spans a complete blue spectrum from pale to darkest, plus warm tones: Regatta Sky Blue (pale sky blue, trailing), Saphir Special (electric cobalt blue, trailing), Crystal Palace (deep blue-violet, upright bronze foliage), Riviera Rose (magenta pink, upright), and Riviera Midnight Blue (deepest navy-midnight blue, upright). For a composed, blue-toned border or massed display, Riviera Midnight Blue as the darkest anchor alongside Crystal Palace and Regatta Sky Blue creates a sophisticated tonal progression from pale through medium to darkest blue.

Variety Details

• Variety: Riviera Midnight Blue
• Series: Riviera
• Breeder: PanAmerican Seed
• Species: Lobelia erinus
• Family: Campanulaceae
• Flower color: Deep navy-midnight blue with bright white eye
• Foliage: Green to bronze-green
• Height: 12–15 cm
• Spread: 20–25 cm
• Habit: Compact, ball-shaped, mounded — upright bedding/edging type
• Germination: 14–21 days at 18–24°C with light
• Early flowering: ~15 days earlier than standard varieties

Key Features

• Riviera series from PanAmerican Seed — extra-early flowering compact bedding lobelia.
• Deepest navy-midnight blue with white eye — the darkest blue in the lobelia range.
• Particularly effective in shaded positions — deep color holds intensity in lower light.
• Extra-early flowering — approximately 15 days ahead of standard varieties.
• Ball-shaped compact mounded habit — uniform, neat, self-supporting.
• Frost tolerant cool-season thriver — ideal for Gulf autumn through spring.
• Profuse flowering throughout the cool season.
• Excellent as dark anchor color in blue-toned border and container designs.
• Attracts beneficial insects and pollinators.

Plant Information

• Plant type: Tender annual
• Sun: Partial sun to full shade — one of the most shade-tolerant lobelia varieties; excellent in deep shade
• Soil: Fertile, moist, well-drained, pH 5.5–6.5
• Water: Keep evenly moist — avoid water stress
• Spacing: 10–15 cm apart; plant in groups of 3–5 seedlings

Seed Germination

• Seed depth: Surface sow — press lightly; do NOT cover; light required for germination
• Germination time: 14–21 days at 18–24°C
• Ideal germination temperature: 18–24°C
• All germination requirements are identical to Riviera Rose. Surface sow on moist, fine, well-drained seed-starting mix. Mix with fine sand for even distribution. Press lightly without covering.
• Water from below where possible. Keep consistently moist at 18–24°C.
• Germination takes 14–21 days.
• Transplant in small clumps of 3–5 seedlings.

Growing Tips

• All growing requirements are identical to Riviera Rose.
• Start 8–10 weeks before desired transplanting date. Transplant in clumps of 3–5 seedlings 10–15 cm apart.
• Midnight Blue is particularly well suited to shadier positions where many other lobelia varieties lose color intensity.
• The deep, saturated navy color holds its visual impact in partial to full shade, making it one of the most valuable lobelia selections for Gulf courtyard, sheltered patio, and low-light container applications.
• Day-length supplementation above 12 hours accelerates flowering — especially relevant during Gulf autumn short days. Keep consistently moist. Feed every 2–3 weeks.
• Cut back by half if flowering slows in warming spring temperatures.

Gulf Planting Season

• Best sowing time in the Gulf: August–September (indoors)
• Transplanting: October–November
• Expected flowering: November–March (extra-early advantage — ~15 days before standard varieties)
• Note: Deep color is particularly effective in shaded Gulf positions where lighter-colored lobelia varieties may lose visual impact.
• Afternoon shade placement strongly recommended for extended cool-season performance.

Garden and Container Uses

• Shade garden planting — deep color holds intensity in low-light positions
• Border edging — navy-midnight blue anchor color in blue-toned schemes
• Mass bedding — uniform dark blue carpet for deep color impact
• Container filling — darkest blue “filler” in mixed container designs
• Window boxes and troughs
• Rock gardens and raised beds
• Paired with Riviera Rose for classic blue/pink complementary border edging
• Anchor of blue spectrum in multi-variety lobelia displays
• Pollinator-friendly — attracts beneficial insects and butterflies