Quamoclit Plant Growing & Care Guide for Gardeners
Article by Dean Ravenscroft, Ph.D. - Updated 17th Oct 2023
In this Gardener's HQ guide, we'll explore cultivating Quamoclit plants in your garden, indoor spaces, and other settings.
- Plant Characteristics: Quamoclit plants boast vibrant, tubular flowers that bloom from summer to autumn. With a height of up to 20 feet, they're perfect for introducing vertical drama in gardens—ideal for dressing up trellises, fences, or balconies.
- Ideal Growing Conditions: Prefers sunny to partially shaded areas. Light, sandy soil is the go-to choice. Hardy for USDA Zones 9-11.
- General Care: Keep the soil moist, but avoid waterlogging. A balanced, slow-release fertilizer at the season's start will do wonders. Provide a support structure so it can climb.
Cypress Vine, Star Ipomoea, & Cardinal climber: Cultivation & Garden Use
Quamoclit plants are half hardy perennial vines that can reach from 3 to 6 meters (10 to 20 feet) in height.
They bloom in the mornings and evenings from summer to autumn. In bloom, they carry tubular shaped flowers of orange, yellow or red.
They are an ideal plant for use in Landscaping: with their vibrant blooms and climbing habit perfect for creating vertical interest on trellises, fences, or pergolas. They can also be used to add bursts of color to balcony railings or as a trailing component in container gardens.
Ipomoea Quamoclit by Mike Epp.
Some common names for Quamoclit include Star Ipomoea, Spanish Flag, Cypress vine, Cardinal climber, and Scarlet Star Glory.
Recently members of the genus have been reclassified into Ipomoea plant genus. E.g., The cypress vine, originally classified under the Quamoclit vulgaris is now called Ipomoea Quamoclit. Other former members include Quamoclit pennata and Quamoclit coccinea.
- Vigorous Climber: Quamoclit is a fast-growing vine, perfect for trellises, fences, or pergolas.
- Seeds: You can sow seeds directly into your garden after the last frost. Soaking seeds overnight can boost germination rates.
- Sunlight: These vines love the sun! Plant them in a location where they can get at least 6-8 hours of direct sunlight daily.
- Watering: Water moderately. While they enjoy a consistent moisture level, avoid letting the soil get waterlogged.
- Attracting Wildlife: The trumpet-shaped flowers are a favorite among hummingbirds and butterflies, making Quamoclit a great choice for a wildlife-friendly garden.
How to Grow Star Ipomoea and other Quamoclit Plants in the Garden
If you're growing Star Ipomoea, Cypress Vine (Ipomoea quamoclit), or other members of the Quamoclit plant genus outdoors from the off, then the seeds should be sown at a depth of 3 mm (1/8 inch).
Put out seedlings during mid-spring, a few weeks after the last expected frost. Space them out between 40 to 90 cm (16 to 36 inches) apart.
As Star Ipomoea are climbing vines, they should be provided with a trellis or similar structure to grow upon.
Quamoclit planst are able to grow in both sunny or partially shaded conditions. They prefer a location with light and sandy soil.
If you are planning to first grow Quamoclit indoors, then first chip the seeds and soak for a day in warm water.
The seeds should then be germinated at 18 to 22 degrees centigrade (64 to 72°F). This should take from one to three weeks. Transplant the seedlings outdoors in mid spring.
Quamoclit vulgaris/Ipomoea Quamoclit (Cypress vine) by Rameshng.
Quamoclit Plant Care
It's easy to care for Quamoclit plants, such as Star Ipomoea and Cardinal climbers. Provide a support structure to allow them to grow optimally. Plants thrive in a soil that is kept consistently moist. Water deeply and allow the top inch of soil to dry out between watering sessions; do not allow soil to become waterlogged.
Feed them once at the beginning of the growing season using a balanced (high phosphorus for blooms), slow-release fertilizer. Overfeeding can lead to excessive leafy growth at the expense of flowers, and can also make them more susceptible to pests.
Pruning or pinching back in the early summer can help promote bushier growth and further blooms.
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Growing and Care Facts
- Scientific Name: Quamoclit
- Common Names: Cypress Vine, Star Glory, Hummingbird Vine
- Growing Zone (USA / UK Hardiness): USDA Zones: 9 - 11, RHS Hardiness Rating: H2 (Tender - warm greenhouses)
- Best Used For / Garden Location: Ideal for ornamental gardens, especially in trellises and walls. Sunny location.
- Life Cycle / Plant Type: Annual, Climbing Vine
- Plant Height: 6-15 feet (1.8-4.5 m)
- Plant Spread: 2-4 feet (0.6-1.2 m)
- Blooms: Summer to early Autumn
- Flower Details: Red, tubular flowers, Star shaped.
- Leaf Foliage: Feather-like, delicate,Green.
- Fruit: Not significant.
- Best Light Conditions: Full sun.
- Suitable Soil Types: Well-draining soil; moderately fertile.
- Sowing, planting: Direct sow seeds following the last frost. Cover lightly with soil.
- Germination time: 7 to 21 days at 64-72°F (18-22°C).
- Propagation: By seeds.
- Plant Care: Regular watering but avoid waterlogging. Prune to control its growth as needed.
- Growing in pots and containers: Yes, ensure well-draining soil and a support structure.
- Growing as a House plant: Can be grown indoors with sufficient light. Ensure proper drainage and keep in a well-lit location.
- Miscellaneous: Attracts hummingbirds due to its tubular red flowers. Not known to be invasive.
- Pests and diseases: Aphids and spider mites.
- Common Garden Species / Cultivars / Varieties: Quamoclit pennata: Known for its bright red flowers and feathery leaves. Quamoclit coccinea: Features intense scarlet flowers.
- Family: Convolvulaceae, the Morning Glory family, thus closely related to Convolvulus.
- Native: Central and South America.
- References and Further Reading: NC Extension Guide to Ipomoea quamoclit.
Common Questions
How many members does the Quamoclit genus contain?
The Quamoclit genus, also known as Cypress vine, contains just two species.
Are Quamoclit plants suitable for gardens, if so which species are most popular?
These plants are often grown in gardens for their attractive, fern-like foliage and trumpet-shaped flowers, making them a favorite for trellises and fences.. Among them, the most widely grown species is Quamoclit pennata, the Cypress Vine, which is recognized by its bright red, star-shaped flowers.
Are Quamoclit plants fragrant?
Plants are not typically fragrant.
What is the perfect location to grow Quamoclit?
Quamoclit prefers a sunny spot with well-drained soil. They are climbing vines so do well with a support structure to grow on.
Is Quamoclit invasive in the USA, if so in which states?
Quamoclit pennata (Cypress Vine) is currently considered invasive in some parts of the southeastern USA due to its rapid growth and reseeding ability.
How do I remove Quamoclit plants from my garden?
Removing Quamoclit involves uprooting the plant and preventing seeding by removing flowers before they can set seed.
Summary
The Quamoclit genus is part of the large Morning glory family. These plants are typically climbing or twining vines, and are known for their vibrant, trumpet-shaped flowers.
Quamoclit plants are best suited to warm climates and require a sunny location with well-drained soil for optimal growth. They can be planted in the spring after the danger of frost has passed. For optimal growth of these climbing plants, maintain a moist soil and provide a trellis for support.
I hope that you enjoyed this guide on how to grow Quamoclit plants. You may also enjoy my gardening guides on how to grow Ixia, Ionopsidium plant, and Iris plants.
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