Rankin's trumpet flower (Gelsemium rankinii)

Also known as: Swamp jessamine

**Gelsemium rankinii** is a vine capable of climbing over other vegetation to heights exceeding 6 meters. It features glossy green leaves and clusters of striking yellow flowers.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Rankin's trumpet flower

Lifespan

Perennial

Plant Type

Vine

Plant Height

6 m

Spread

2.5 m

Leaf Color

Dark green

Flower Size

2.5 cm to 8 cm

Flower Color

Yellow

Images of Rankin's trumpet flower

Quickly Identify Rankin's trumpet flower

Woody, evergreen vine with simple, opposite leaves and smooth margins.

Bright yellow, funnel-shaped flowers with five lobes in spring and fall.

Distinctive slim, flattened capsules as fruit, ripening in September to October.

Waxy, lanceolate leaves measuring 3-5 inches (7.6-12.7 cm) with shiny, dark green upper surface.

Pinnate veins and entire margins on glossy leaves provide a unique appearance.

Scientific Classification of Rankin's trumpet flower

Phylum

Vascular plants

Class

Dicotyledons

Order

Gentianales

Family

Logania

Genus

Trumpetflower

Species

Rankin's trumpet flower

Planting and Growing of Rankin's trumpet flower

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Partial sun

Sunshine Duration

6-10 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

5.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Rankin's trumpet flower?

For Gelsemium rankinii, it is crucial to ensure that the soil remains moist but not waterlogged. Watering with about 500 ml each time should suffice, allowing the water to fully penetrate the soil while ensuring excess water drains away to prevent root rot.

What are the symptoms of an underwatered Rankin's trumpet flower? ›

What should I do if my Rankin's trumpet flower is not getting enough water? ›

What are the symptoms of an overwatered Rankin's trumpet flower? ›

How to save an overwatered Rankin's trumpet flower? ›

What Are the Sunlight Requirements for Rankin's trumpet flower?

Sunlight Requirements: Partial sun

Duration of light: 4 to 6 hours

Partial sun suits Gelsemium rankinii best, supporting healthy photosynthesis without harsh exposure. Achieving this balance ensures lush growth and abundant flowering, enhancing the plant's overall health.

What is the best amount of sunlight for Gelsemium rankinii? ›

How can I ensure my Gelsemium rankinii gets optimal light exposure? ›

What are the benefits of Gelsemium rankinii receiving ideal light conditions? ›

What Is the Ideal Temperature Range for Rankin's trumpet flower?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for Gelsemium rankinii is between 60°F and 75°F. This range ensures optimal growth and vibrant blooms, providing just enough warmth without causing stress to the plant.

What Soil is Best for Rankin's trumpet flower?

Soil type: Loam, Sandy loam

Soil PH: 5.5 ~ 7.5

The Gelsemium rankinii thrives in well-drained soil, which helps prevent root rot by allowing excess water to escape. This aids in maintaining healthy, vigorous growth by keeping the roots oxygenated. This plant benefits from a substrate rich in organic matter that supplies essential nutrients. The presence of adequate nutrients promotes lush foliage and vibrant flowering. Gelsemium rankinii prefers soil with moderate moisture levels. Consistent moisture without waterlogging helps sustain steady growth and prevents stress during dry periods.

How to Fertilize Rankin's trumpet flower?

Fertilizer type: Balanced

For Gelsemium rankinii, apply liquid fertilizer at half the recommended strength per the manufacturer's instructions. This plant enjoys a balanced supply of nutrients without overwhelming its root system. A small amount is generally better to avoid 'fertilizer burn.'

How to Prune Rankin's trumpet flower?

Pruning Time: Spring, Summer

Begin by identifying and removing any dead or diseased wood. This step is crucial as it prevents disease spread and encourages healthier new growth. Trim back excess growth to maintain the desired shape of the plant. Focus on cutting back long, unruly stems, which will encourage bushier and more attractive growth patterns. Thinning out dense areas allows for better air circulation, which reduces the chances of fungal diseases. Cut back overlapping branches to open up the plant's structure. More About Pruning Techniques→

How to Propagate Rankin's trumpet flower plant?

Propagate Time: Spring, Early Spring, Summer

Begin by collecting mature seeds from the plant. Clean them thoroughly and allow them to dry before planting. This helps in removing any pulp that might hinder germination.

Select healthy, non-flowering stems for cuttings. Cut a 4-6 inch piece, remove lower leaves, and dip the cut end in rooting hormone to enhance root formation.

Gently remove the plant from its pot, shake off excess soil, and carefully divide the root ball. Each division should have a healthy set of roots and at least one stem.

More About Propagating Techniques→

How to Repot Rankin's trumpet flower plant?

Repotting frequency: Every 2-3 years

Repot Gelsemium rankinii when you notice its roots becoming pot-bound or emerging through drainage holes. Additional signs include slow growth or water retention issues. Spring is ideal when active growth resumes.

Select a pot that is 1-2 inches larger in diameter than the current one. Choose a pot with good drainage to prevent water-logging. This size ensures enough room for root expansion and healthier growth.

Use a well-draining loamy mix to ensure good aeration and moisture control. Loamy soil allows adequate water retention without becoming soggy, preventing root rot and promoting healthy plant development.

Toxicity

Ingestion

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.