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Native Wildflower · Easy

How to Grow Cardinal Flower

Lobelia cardinalis

Your complete guide to growing Cardinal Flower.

☀SunFull sun to partial shade (4-6+ hours)
💧WaterModerate — regular watering
🗺Zones3–9
📏Height4-5 feet
Cardinal Flower📷 Wikimedia Commons

When to Plant Cardinal Flower

Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.

ZoneStart IndoorsDirect SowHarvest
Zone 3 — May – July —
Zone 4 — April – June —
Zone 5 — April – June —
Zone 6 — April – June —
Zone 7 — March – May —
Zone 8 — March – May —
Zone 9 — February – April —

Companion Plants for Cardinal Flower

✓ Good companions

Astilbe

Similar moisture and partial shade requirements, creates layered woodland garden

Ferns

Natural woodland companions that help maintain soil moisture and humidity

Heuchera

Provides contrasting foliage texture while tolerating same moist, shaded environment

Hosta

Complementary foliage provides backdrop while sharing moist soil preferences

Impatiens

Shares preference for moist soil and partial shade, extends blooming season

Monarda

Fellow native that attracts beneficial insects and shares similar growing conditions

Wild Columbine

Both attract hummingbirds and thrive in similar moist, partially shaded conditions

Wild Ginger

Provides ground cover and retains moisture in the shared shade habitat

✗ Keep away from

Black Walnut

Produces juglone which is toxic to many plants including Cardinal Flower

Lavender

Requires dry, well-drained soil opposite to Cardinal Flower's moist soil needs

Rosemary

Needs dry Mediterranean conditions that conflict with Cardinal Flower's moisture requirements

Notes from the garden

A greener inbox, occasionally.

Seasonal planting ideas, useful tips and a little inspiration. No weeds.