Light Needs
Mature Height
Mature Spread
Growing Zones
A wonderful choice for those gardeners looking for an outstanding blue flower for the perennial bed. In late summer, spikes of bright blue flowers grow 30 inches tall from a plant base with a width of 6 to12 inches. Native to North America this perennial would make a wonderful, late season addition to any garden!
A low maintenance perennial that is deer and rabbit resistant, attracts many different pollinating insects and hummingbirds. This perennial would look amazing as a mass background planting in a perennial bed, walkway, woodland garden or in a pot or container that is at minimum 24 inches wide and deep. A good choice for wet areas. The leaves may be damaged by slugs, leaf spot and rust. All parts of the plant are poisonous. Winter hardy in zones 4 to 9.
Native Blue Cardinal Flower Care
A perennial that will accept a wide range of light conditions as it will tolerate both full sun and shade provided it is grown in a rich, moist, well-drained soil. Benefits from an application of humus or compost although it will do well in a wide range of soil types.
If allowed to go to seed this perennial will readily reseed itself if not cut back. Once the seed pods have matured, and the seeds dispersed, the remaining foliage and past flower stalk may be cut down to the ground.
Native Blue Cardinal Flower Spacing
Space at a distance of 18 to 20 inches apart when growing in the perennial bed, as an accent plant, in groups or in a pot or planter.
Native Blue Cardinal Flower Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 4 to 8 (perennial); grown as an annual elsewhere (outdoors year-round); grown indoors elsewhere (outdoors year-round); grown in containers elsewhere (grown as a seasonal crop)
- Sun Exposure
- Part Sun to Full Sun (5+ Hours Direct Sun)
- Mature Height
- 3 Feet
- Mature Spread
- 1-2 Feet
- Growth Habit
- , Upright
- Water Needs
- Consistently Moist
Flowers & Foliage
- Flower Colors
- , Blue
- Flower Description
- Blue
- Bloom Time
- Summer
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering
Garden Benefits
Plant Overview
- Common Name
- Native Blue Cardinal Flower
- Botanical Name
- LOBELIA SIPHILITICA
Simple Plant Spacing Calculator
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2026 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!