Shrub · Gelsemiaceae
Carolina Jessamine
Gelsemium sempervirens
Give it full sun and something sturdy to climb, and this easygoing evergreen vine rewards you with fragrant yellow trumpets in late winter.
Full sun
Every 7–14 days
USDA 7–10
10–20 ft · 3–6.1 m
Overview
Carolina jessamine is the cheerful evergreen vine that brightens the South with fragrant yellow trumpets while much of the garden is still napping. It twines happily up fences, arbors, and mailboxes, and in one fast season it can send stems 12 to 20 feet long. South Carolina loved it so much it became the state flower, and you will see why the first spring it blooms for you.
Here is the reassuring part: it asks very little in return. Hardy through zones 7 to 10, it laughs off heat, accepts drought once it has settled in, and rarely troubles you with pests or disease. The one wish it has is full sun, because a vine tucked into shade makes plenty of leaves but only a few flowers, and that is an easy thing to fix.
There is one important caution to know before you plant. Despite the jasmine in its common name, this is not a true jasmine, and every part of it is dangerously poisonous. The leaves, stems, roots, and even the sweet nectar carry strychnine-related alkaloids, so plant it well away from children, pets, and grazing animals and you can enjoy it with a clear mind.
Care
The short version: give it full sun for the best bloom, rich well-drained soil, and a steady drink while it is young, then prune hard right after it flowers and offer a sturdy support to climb.
Light
Give it full sun for the most generous bloom. It will accept partial shade and stay green there, but a shaded vine trades its flowers for foliage and looks a little thin on color, so the sunnier the spot, the happier you both will be.
Water
Keep the soil moist while the plant is young, watering every 7 to 14 days as it gets established. Once its roots are settled it copes with drought just fine, though a vine left bone-dry will drop leaves and bloom less, so a drink in dry spells is always kind.
Soil
It is an easy plant to please, growing in rich, well-drained ground across a generous pH range of 5.0 to 8.0. Good drainage matters far more than the exact soil type, so do not fret over getting it perfect.
Temperature
Hardy from roughly 10°F to 100°F (-12°C to 38°C), it takes Southern heat and a fair cold snap in stride. That wide comfort range is what makes it so dependable across zones 7 to 10.
Humidity
Ordinary outdoor air suits it just fine, so there is no humidity target to chase. It feels right at home in the humid Southeast and settles in just as contentedly in drier gardens.
Feeding
A balanced slow-release feed in spring is truly all it needs, applied seasonally. This is not a hungry plant, and going heavy with fertilizer does more for leaves than for flowers, so a light hand is best.
Pruning
Prune right after flowering, while there is still time for new growth to set next year's buds. Trim to keep its size in check and head off a top-heavy tangle, and on an old leggy vine you can cut the whole thing back to a few feet above the ground to wake up fresh growth from the base.
Repotting
rarely
Size & spacing
Look forward to a fast climber that reaches 10 to 20 feet (3 to 6 m) and spreads 3 to 6 feet (91 to 183 cm) wide. Give it a sturdy support and room to roam, since it twines and piles on growth in a hurry.
When to plant
Carolina jessamine is an early riser, often opening in February while the rest of the garden waits. Set new plants out in spring or fall, snip them back as soon as the bloom fades, and you may be treated to a gentle second flush of flowers come autumn.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: spring or fall
- Harvest: late winter to early spring (February-April), with sporadic fall rebloom
Hardiness
USDA hardiness zones: 7–10
Temperature: down to -18°C
Troubleshooting
Good news for a first-time grower: this vine is wonderfully easy to keep, with no serious pests or diseases to worry over. The few hiccups that do appear come down to pruning and how much sun it gets. Find your symptom below and the fix is usually a simple one.
A heavy crown of growth above bare, woody stems
If a few years slip by without pruning, fresh growth keeps stacking on the old until the top becomes a thick mat and the bottom turns leggy and bare. Take heart, because this is just skipped pruning and stems that were never guided onto a support, and it is easy to put right. Cut the heavy top growth back to a few feet above the ground as soon as the flowers fade, then gently tie the remaining stems to the support so your plant can fill in evenly again.
Fix:
- Prune hard right after flowering, cutting older top-heavy vines back to a few feet above ground level
- Train remaining stems onto the support to spread growth evenly
Lots of healthy leaves but hardly a bloom in sight
When a jessamine grows green and full yet refuses to flower, the answer is nearly always too much shade, and that is reassuring because it means nothing is wrong with the plant. It simply needs full sun to bloom its best. Move it or coax it toward a sunnier spot, and trim back any overhead branches that are keeping it in shadow.
Fix:
- Relocate or train the vine into a position receiving full sun
- Thin overhead shade where possible
Toxicity
This is a lovely plant and, in all honesty, a genuinely dangerous one. Every part holds strychnine-related alkaloids, including the sweet nectar that has poisoned children who took the flowers for honeysuckle. No part of it is safe to eat, suck, or chew, and the same toxin can harm dogs, cats, horses, livestock, birds, and even the honeybees that visit the blooms, so a little caution keeps everyone safe.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Severe
A cat that chews even a little of any part can turn weak and unsteady within hours, its muscles drooping, swallowing growing hard, and breath slowing and turning shallow. The pupils may shift, the body cools, and seizures or worse can follow. There is sadly no safe nibble here, so keep it out of reach.
Dogs Severe
After a dog mouths the leaves, stems, or flowers, look for sudden weakness, a wobbly gait, and trouble swallowing. As the alkaloids take hold the breathing slows, the body cools, and seizures, paralysis, or death may follow. Call your vet right away if you suspect a bite.
Horses Severe
A grazing horse can begin with muscle tremors and weakness that build toward convulsions and labored breath. Every part of the vine is dangerous and a deadly dose is small, so keep it well away from pastures and paddocks for safety's sake.
Rabbits Severe
The same nerve poison that brings down larger animals is far too much for a little rabbit, leading to weakness, tremors, and collapse. No part is safe to offer or to let one reach, so fence it off completely.
Livestock Severe
Cattle, goats, and sheep that browse the foliage can face muscular weakness, convulsions, and respiratory failure, and a small amount can kill. The kind thing is to fence it out of any space where stock graze.
Birds Severe
The alkaloids hit birds hard, and even honeybees are poisoned by the nectar and pollen. Pet birds should never reach the leaves, stems, or blooms, so keep cages and aviaries well clear.
People Caution
No part of this plant is food. Children have been poisoned sucking the sweet nectar after taking the yellow flowers for honeysuckle, and even small amounts can bring weakness, dizziness, slowed breathing, and seizures. Keep it away from children and wash your hands after pruning.
Treat as a deadly poisonous plant: keep all parts away from children, pets, and livestock; do not let anyone suck or eat the flowers, and wash hands after handling since the sap can irritate sensitive skin.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
A handful of named selections gently improve on the wild vine, and one close relative is worth knowing if your ground tends to stay wet.
Margarita
A selection prized for being extra cold-hardy, and it carries flowers a touch larger than the wild species.
Pride of Augusta (Plena)
A double-flowered form whose blooms linger across a longer stretch of the season.
Gelsemium rankinii (swamp / Rankin's jessamine)
A native cousin with scentless flowers that rebloom freely in both spring and fall and forgive wetter ground.
How to propagate
There are three friendly ways to make more Carolina jessamine, and because the sap is toxic, each one simply asks you to wash your hands when you finish.
Stem cuttingsEasy
Late spring to summer · Several weeks to a few months
Semi-hardwood cuttings are your most dependable route to copy a named cultivar true to type, and they are wonderfully forgiving. Take them in late spring or summer, and over several weeks to a few months they root into a plant just like the parent.
SeedModerate
Fall or spring · One or more seasons
Growing it from seed sown in fall or spring is perfectly possible, though a named cultivar will not come true this way and the plant needs one or more seasons to settle in. Every seed and seedling is toxic, so handle them with gentle care.
LayeringEasy
Spring to summer · A few months
This is the easiest trick of all: where a low twining stem rests on the soil in spring or summer it roots itself within a few months, and then you can simply sever the rooted piece and move it.
Myths
Carolina jasmine is a true jasmine, so its fragrant flowers are safe to touch or taste.
This is not a jasmine at all, which is exactly why it goes by false jasmine, and it sits among the most poisonous vines you can grow. Every part, right down to the sweet nectar, holds strychnine-related alkaloids, and children who sucked the flowers have been seriously poisoned alongside pets and livestock. Please never treat its yellow blooms as honeysuckle or any other edible plant.