Species

Lobelia speciosaHybrid Lobelia

8 other cultivars

perennial

Compliment Blue Lobelia

Lobelia speciosa 'Compliment Blue'

The Story

Plant Bio

Lobelia x speciosa 'Compliment Blue' is a perennial shrub with dense, bushy growth, featuring lance-shaped green leaves and striking spikes of vibrant blue flowers that bloom in summer.

This cultivar is renowned for its long-lasting, intense blue flowers and its compact, tidy habit, making it an excellent choice for borders and container planting.

Uses & Benefits:

Provides vibrant blue blooms throughout summer, attracting pollinators and enhancing shady garden areas.

Prefers moist soil, ideal for shaded borders and containers.

Supports bees and butterflies, contributing to local biodiversity.

SpeciesLobelia speciosaHybrid Lobelia

Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

12 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Prefers moist, humid environments

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic to humans and pets

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into moist soil in early spring.
Keep soil consistently moist for best germination.
Place in partial shade with good airflow.
Water regularly during dry spells, especially in summer.
Divide clumps every 2-3 years in early spring.
Mulch to retain moisture and suppress weeds.

Pro Tip

Ensure soil stays moist and provide partial shade for optimal growth.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 💧
Mulch around the base to retain moisture
Prune back after flowering to promote bushiness

Don't

Avoid letting soil dry out completely ❌
Don’t place in full, harsh sun
Skip overwatering in winter

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Spring Cleanup
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Pollinator-friendly borderShady cottage garden bed

Companion Plants

Ferns Hostas Astilbes

Multiply

Propagation Methods

Good to Know

Common Questions

Compliment Blue Lobelia questions

What zones can Compliment Blue Lobelia grow in?

Compliment Blue Lobelia is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Compliment Blue Lobelia deer resistant?

Not reliably. Deer may browse Compliment Blue Lobelia, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Compliment Blue Lobelia bloom?

Compliment Blue Lobelia typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Compliment Blue Lobelia need full sun?

Compliment Blue Lobelia does best in part shade.