Light Needs
Mature Height
Mature Spread
Growing Zones
Tall, graceful spires of scarlet red blooms will dazzle you. The bronzing on the green leaves perfectly complements the cardinal-red color of the blossoms. Hummingbirds and butterflies will be attracted to your garden by the tubular flowers that appear in its first year. Lobelia speciosa has a long, summer bloom period. It grows to a height of 22-28 inches, thriving in wet locations.
Starship Scarlet Bronze Leaf™ has a growth habit that is upright, sturdy, and bushy. It has no serious insect or disease problems; deer and rabbits avoid eating it. Native to North America, it is well adapted as a garden plant. The name, Lobelia, honors Matthias de l'Obel (1538-1616), a French physician and botanist. Use this plant in the role of ‘filler’ in combination pots or mass them in the border where they will add late summer height and color. Use them in difficult wet locations, and in rain gardens. They make beautiful cut flowers – cut them when the flowers are almost open.
Starship Scarlet Bronze Leaf Cardinal Flower Care
This is an easy-care plant that thrives in rich, medium-to-wet soils of any texture. Plant it on a cloudy day, or in the late afternoon, to reduce transplant shock. Dig a hole large enough to accommodate the root ball. Unpot the plant, gently loosening the roots to encourage good growth. Plant with the top of the root ball even with the surrounding soil. Water thoroughly and mulch lightly. You may apply a light fertilizer after new growth appears. Locate your Cardinal Flower in part sun to sun. When planting it in dry soil, site it in a location with part shade (4 to 6 hours of direct sunlight).
Deadheading spent flowers will encourage reblooming. In cold climates before winter, prune the dead stalks and stems and add mulch to protect the root system. Starship Scarlet Bronze Leaf™ is stunning in containers, just do not let them dry out completely, making sure they have adequate drainage. In mixed containers, pair them with other moisture-loving plants.
Starship Scarlet Bronze Leaf Cardinal Flower Spacing
Companion plants for this lobelia are ornamental grasses and coreopsis. Space your plants 16-22 inches apart from center to center.
Starship Scarlet Bronze Leaf Cardinal Flower Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 6 to 10 (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
- 22-28 Inches
- Mature Spread
- 16-22 Inches
- Growth Habit
- , Upright
- Water Needs
- Consistently Moist
Flowers & Foliage
- Flower Colors
- , Red
- Flower Description
- Red
- Bloom Time
- Summer
- Foliage Color
- , Red
- Foliage Description
- Green, Bronze
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering, Fall Flowering
Garden Benefits
Plant Overview
- Common Name
- Starship Scarlet Bronze Leaf Cardinal Flower
- Botanical Name
- Lobelia speciosa 'Scarlet Bronze Leaf'
- Brand
- Proven Selections
- Plant Type
- Perennial
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!