Annuals

Lobelia erinus 'Techno Heat Dark Blue'

Techno® Heat Dark Blue lobelia

Techno® Heat Dark Blue lobelia ('Tech Darbule'), photo courtesy of Ball Horticultural Company; PP20,681. Propagation is prohibited.

Dark blue-purple flowers cover fine, trailing growth. This heat-tolerant lobelia is useful in hanging baskets and around the edge of mixed containers. Keep the roots evenly moist to support a long display from spring into fall.

At a glance

Sun: Full sun to part sun
Mature size: 6–10 in. tall × 18–22 in. wide
Water: Moist, well-drained soil
Bloom: Blue-purple; spring through fall
Life cycle: Frost-tender seasonal plant locally

Sizes & prices

3.5''$5.99

Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.

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Resistance & tolerances

Wet soil: Avoid waterlogged soil and standing water.
Heat: More tolerant than traditional bedding lobelia.

Pollinators & wildlife

Attracts: Butterflies

Growing & care

Soil & drainage: Use freely draining garden soil or a container with drainage holes.
Pruning: Deadheading is not needed. Trim straggling stems if necessary.

Sources & photo credits

Lucas Greenhouses

Photo: Techno® Heat Dark Blue lobelia ('Tech Darbule'), photo courtesy of Ball Horticultural Company; resized for web without enlargement. · Ball customer promotional-use photo license

Image notes: Techno® Heat Dark Blue lobelia ('Tech Darbule'), photo courtesy of Ball Horticultural Company; resized for web without enlargement. PP20,681. Propagation is prohibited.

Reviewed September 22, 2026. Growing conditions vary by location.