Cardinal Climber (Ipomoea) Plant Care and Growing Tips

The Cardinal Climber, scientifically known as Ipomoea sloteri, belongs to the morning glory family, Convolvulaceae. It has unique deeply lobed green leaves and features bright red, tubular flowers that attract hummingbirds and butterflies. These blooms, which are about 2 inches long, typically appear from summer to early fall.

Cardinal Climber Seeds
from: Botanical Interests

Botanical Name:  Ipomoea sloteri

Common Names:  Cardinal Climber, Hearts and Honey Vine.   It can be confusingly referred to as Cypress vine, which is the common name of Ipomoea quamoclit a parent plant.

Hardiness Zone:  10-12 (USDA); annual in colder zones   

Bloom Time:  Summer to Fall  

Pollinators:  Hummingbirds, bees, and butterflies      

Mature Size: Cardinal Climber Vine is a vigorous grower that reaches 10 – 20 feet in a single growing season.    

 Sun Exposure: Full sun (at least 6 hours of direct sunlight daily).  Cardinal Climber Vine will tolerate partial shade but will not grow as vigorously and flower production will be reduced.

Soil Type: Cardinal Climber thrives in well-draining soil that is rich in organic matter. A neutral pH (6.0 to 7.2) loamy soil is most desired.  

Consider using a potting mix if planting in containers. Ensure the container has adequate drainage holes so soil drains sufficiently.

Moisture: Prefers moist soil but can tolerate dry soil if not allowed to dry out for extended periods.  You should keep the soil consistently moist but not soggy. Check the soil frequently during times of excessive heat.  Lack of sufficient water will affect plant growth. I found the plants grown in containers that frequently dried out during hot days did not grow as vigorously and had fewer leaves and blooms.

 Best Planting Time

The ideal time to plant Cardinal Climber seeds is 1 to 2 weeks after your average last frost date.  Plants started too early outside may be less vigorous than plants started when warmer.   

If starting indoors, begin seeds about 4-6 weeks before transplanting outdoors.  Cardinal Climber does not like to be transplanted, so consider sowing seeds in biodegradable pots that can be planted directly in the ground to avoid disturbing roots. 

Uses in the Landscape

Trellises and Arbors: This plant thrives on structures, making it ideal for trellises, arbors, obelisks and fences. It creates a lush, green backdrop.

Groundcover: It can be used as a dense groundcover to fill bare spots or slopes.

Attracting Pollinators: Its bright red flowers attract hummingbirds, bees, and butterflies, making it a great addition to pollinator gardens.

Privacy screen: Plant seeds densely to create a fast-growing lush privacy screen

Containers: You can grow Cardinal Climbers in pots for patios or balconies. The cascading vines add texture and vibrant color to any outdoor location.

Softening Walls: Great for softening walls or stone structures with its airy lightweight foliage.

Mixed Beds: Planting alongside other flowers and shrubs creates a dynamic landscape. Its vivid red blooms contrast beautifully with lacy greenery.

 Care of Cardinal Climber

Fertilizing: Generally does not need fertilization unless the soil is poor.  If fertilization is needed, a balanced, slow-release fertilizer can be applied in the spring.

Pruning:  Deadheading flowers is not necessary.  Trim as needed to control growth.

Common Pests and Diseases: Rabbits and deer like to eat Cardinal climber, however it is toxic to humans and pets.

Frequently Asked Questions

Is Cardinal Climber Vine an annual?

In colder climates, it is an annual.  In warmer climates, it can re-seed and may become a nuisance.  Promptly remove seed pods to reduce re-seeding. 

If Cardinal Climber is an annual in my area, can I save seeds to grow next year?

Yes you can allow seed pods to form on the vine and save seeds for planting the next year.

Will Cardinal Climber grow from seed in zone 5 and produce flowers in the same season?

Yes Cardinal Climber is a fast growing annual vine which will quickly grow to fill space and produce flowers in the same season. The ideal time to plant Cardinal Climber seeds is 1 to 2 weeks after your average last frost date.

The distinct foliage of the Cardinal Climber is sizable yet interspersed, allowing its delicate blossoms to stand out. This charming vine adds a unique touch to any garden with its unparalleled characteristics.

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