Gelsemium Species, Rankin's Jessamine, Rankin's Trumpetflower, Swamp Jessamine

Gelsemium rankinii

Family: Gelsemiaceae
Genus: Gelsemium (jel-SEM-ee-um) (Info)
Species: rankinii
View this plant in a garden


Vines and Climbers

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Requires consistently moist soil; do not let dry out between waterings

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


15-20 ft. (4.7-6 m)


6-8 ft. (1.8-2.4 m)


USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Where to Grow:

Unknown - Tell us


Parts of plant are poisonous if ingested

Bloom Color:

Bright Yellow

Bloom Characteristics:

Flowers are fragrant

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:


Propagation Methods:

By dividing the rootball

Seed Collecting:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

Niceville, Florida

Albany, Georgia

Clarkston, Georgia

Marietta, Georgia

Omega, Georgia

Ray City, Georgia

Amite, Louisiana

Independence, Louisiana

Durham, North Carolina

Matthews, North Carolina

Rocky Mount, North Carolina

Austin, Texas

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Gardeners' Notes:


On Mar 22, 2012, zkmayo from Matthews, NC wrote:

Ive had this plant for two years now. Ive been trying to cover a simple arbor with it. Its grown a couple feet, but not a great deal. It flowers well, but no fragrance. I may put it in a container on my deck and replace the arbor planting with a Carolina Jasmine.


On Apr 1, 2011, roughbeast from Los Angeles, CA wrote:

We just planted this in a large pot with a trellis, and it's doing fine. We're in Los Angeles, also known as a desert, so we'll have to water it. I have two concerns: the salesperson at the large garden chain that sold me this plant called it Carolina Jasmine, but the tag (which I didn't look at) says it's Swamp Jessamine Gelsemium rankinii. When I looked up the Latin name I found that Carolina Jasmine is species sempervirens, not rankinii. Sempervirens has a strong aroma; rankinii does not. The tag also doesn't reveal how toxic Gelsemiums are - alkaloids related to strychnine that can kill honeybees as well as people if eaten.


On Mar 24, 2011, CptnRn from Austin, TX (Zone 8b) wrote:

This is a beautiful hardy plant. I have planted 6 of these vines in two different yards, only one died where it was in bad soil that I had failed to correct in any way. The other two that I planted last spring survived the record high temperatures, the winter drought and record freezing temperatures. Stayed green and had some flowers all winter, by early March they were covered with hundreds of yellow blossoms and are still blooming. They expanded from a small half gallon pot to cover an 8' wide swath of fence, and one has climbed over 12' high where some of it was able to reach a few branches on a crape myrtle tree. I like this vine a lot because it does not damage the fence or house siding the way ivy and wysteria do.


On Aug 18, 2006, soulbloom from Richmond, VA wrote:

I would like to give this vine a positive review but truth be told, I've had it for over a year and it has had no progress. Still the same size as when I bought it. Whenever it shows some sign of taking off, it dies back to its regular size. I think its the spot I have it in. Its full sun but the soil probably isn't greatest quality.