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Japanese Honeysuckle
The fragrant invasive honeysuckle vine - semi-evergreen, smothering shrubs and young trees and carpeting the ground across the Southeast. Never plant it - grow the native coral honeysuckle instead; this entry is for identifying and controlling it.
Safety notes Japanese honeysuckle is grown for its fragrant flowers, not food. The nectar is traditionally sipped, but only ever from a correctly identified honeysuckle - Carolina jessamine's yellow trumpets are toxic in every part, nectar included, and children have been poisoned mistaking them for honeysuckle. The black berries are mildly toxic (saponins); keep them from children and pets. The bigger problem is ecological: it smothers and girdles natives. Never plant it - grow coral honeysuckle instead.
Overview
Japanese honeysuckle (Lonicera japonica) is the sweet-smelling vine of Southern summers - and one of the most widespread invasive plants in the eastern US. Its intensely fragrant white-and-yellow flowers and the nectar children sip are genuinely charming, which is exactly how it spread so far - though that tradition only ever belongs with a correctly identified honeysuckle, since the yellow trumpets of Carolina jessamine are toxic in every part, nectar included. But it's a serious invasive: a fast, semi-evergreen twining vine that smothers and girdles shrubs and young trees, carpets the forest floor, and climbs into the canopy, crowding out native plants across woods, edges, fencerows, and roadsides.
It's especially tenacious because it spreads three ways: by runners that root as they creep along the ground, by twining stems that build dense tangles, and by bird-dropped seed from its (mildly toxic) black berries. In the mild South it stays green through winter, giving it a competitive jump on natives. The good news is there's a lovely native alternative - coral honeysuckle (Lonicera sempervirens) - that gives you a well-behaved, hummingbird-friendly honeysuckle without the invasion. This entry is here to help you recognize and control Japanese honeysuckle (and tell it from the native), and to point you to what to plant instead. Never plant it.
Quick facts
For identification. Not a growing guide.
- Height
- 20 ftRange: 5–30 ft
- Spread
- 20 ftRange: 5–100 ft
- Cold
- Takes hard frostdamaged below -20°F
- Heat
- Struggles above 105°F
- Life cycle
- Perennial, lives about 30 years
- Self-sows
- Yes. Never let it set seed.
- Habitat
- Full sun · Part sun · Part shade · Shade, well-drained soil
Through the year
A field guide through time
Explore the stages to recognize this plant throughout its life.
Stage 1 of 3 · The recurring year
Semi-evergreen smothering growth (identify & control)
year-round, every year
Know this stage
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Recognize it: semi-evergreen twining vine, opposite oval leaves
Japanese honeysuckle is a fast, twining, semi-evergreen vine with simple, oval, OPPOSITE leaves (paired along the stem), often holding many of its leaves through winter in the South. It carpets the ground and climbs shrubs and small trees, twining and forming dense tangles. Fuzzy young stems and paired oval leaves on a smothering vine (green in the winter woods) point to Japanese honeysuckle.
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Pull/cut and treat; keep after runners and roots
Pull or dig seedlings and small vines (get the roots). For established vines, cut them off shrubs and trees to relieve them, then treat cut stems/regrowth with foliar herbicide - cutting alone lets it resprout and it roots along the ground as it runs. Prioritize removing fruiting vines to stop bird-spread seed. Bag berries and cut stems; never let them root or spread.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Smothering & Girdling (ecological harm)Severity High DisordernowSeason: year-roundVines twining and girdling shrubs and young trees, dense ground mats smothering native seedlings, and semi-evergreen growth staying green in the winter woods.
Vines twining and girdling shrubs and young trees, dense ground mats smothering native seedlings, and semi-evergreen growth staying green in the winter woods.
Cut vines off trees, foliar-treat regrowth and rooted runners (late fall/mild winter targets it selectively), remove fruiting vines, and follow up for several seasons.
Never plant it (grow native coral honeysuckle); cut vines off valuable plants early; control small infestations before they mat.
The core hazard is ecological: Japanese honeysuckle twines around and girdles shrubs and young trees, climbs into the canopy, and carpets the forest floor in dense mats that shade out native seedlings and wildflowers, with its semi-evergreen habit giving it a competitive winter edge.
Rooting Runners, Seed & ResproutingSeverity High DisordernowSeason: Apr–NovVines running and rooting along the ground, clones expanding outward from old plantings, and vigorous resprouting after cutting.
Vines running and rooting along the ground, clones expanding outward from old plantings, and vigorous resprouting after cutting.
Cut-stump herbicide plus foliar treatment of regrowth, grub out runners and roots, and persist for several seasons against resprouts.
Remove fruiting vines to cut off seed; kill roots and rooted runners rather than just cutting; don't let cut stems root.
Why it's hard to remove and keeps expanding: Japanese wisteria roots wherever stems touch soil, runs along the ground to spread a clone outward, and resprouts aggressively from roots, runners, and cut stumps, so cutting alone rebuilds it; it also hybridizes with Chinese wisteria.
Mildly Toxic BerriesSeverity Low DisordernowSeason: Sep–DecYoung children or pets near the small black paired berries in fall and early winter.
Young children or pets near the small black paired berries in fall and early winter.
For ingestion of berries, contact poison control or a veterinarian if symptoms occur; remove fruiting vines to reduce the hazard.
Keep berries away from young children and pets; remove fruiting vines; don't eat the berries.
A minor direct hazard: the black berries are mildly toxic (saponins) and can cause stomach upset if eaten, so they should be kept from young children and pets. The flower nectar, by contrast, is traditionally sipped harmlessly in tiny amounts - but only ever from a correctly identified honeysuckle, since Carolina jessamine's yellow trumpets are toxic in every part including the nectar and children have been poisoned mistaking them for honeysuckle.
Grower tips
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