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Bush Honeysuckle
The arching red-berried shrub that fills the understory of half the woodlots in the Midwest and Northeast - first to leaf out, last to drop, and the reason nothing grows beneath it. It is also the toxic look-alike foragers mistake for autumn olive. Never plant it.
The red paired berries are not food - they are mildly toxic (saponins) and cause vomiting and diarrhea. This shrub matters most to foragers as the red-berried look-alike for autumn olive: autumn olive has ALTERNATE leaves with silvery-scaly undersides and silver-flecked berries, while bush honeysuckle has OPPOSITE leaves, no silver scales, and hollow pith in older stems. Check leaf arrangement before you eat any red berry, and keep the berries away from children and pets.
Overview
The one thing to knowBush honeysuckle is the catch-all name for a group of Asian and Eurasian shrubs - Amur (Lonicera maackii), Morrow's (L.
Bush honeysuckle is the catch-all name for a group of Asian and Eurasian shrubs - Amur (Lonicera maackii), Morrow's (L. morrowii), Tatarian (L. tatarica) and their hybrid Bell's honeysuckle (L. x bella) - that between them have taken over the understory of a huge share of eastern and midwestern woodlots. They are arching, multi-stemmed shrubs, six to twenty feet tall, with paired tubular flowers in late spring and paired red berries in fall.
Their advantage is timing. They leaf out weeks before native trees and shrubs and hold their leaves weeks after, which steals the spring and fall light that woodland wildflowers and tree seedlings depend on. Under an established stand the ground is bare. Birds strip the berries and plant new shrubs for miles, so it arrives without anyone planting it - though plenty of people did plant it, because agencies handed it out for decades. This entry is here to help you recognize it, tell it from the native shrubs and from autumn olive, and get it out - and to be blunt about the berries, which are mildly toxic and are the single most common red-berry mistake foragers make.
Quick facts
For identification. Not a growing guide.
- Life cycle
- Perennial, lives about 40 years
- Where it grows
- Full sun · Part sun · Part shade · Shade, well-drained soil
- Height
- 15 ft6 to 20
- Spread
- 12 ft5 to 18
- Cold
- Takes hard frostdamaged below -35°F
- Heat
- Struggles above 100°F
- Self-sows
- Yes. Never let it set seed.
Through the year
How to recognize it in each season.
First to leaf out, last to drop (the ID window)
Mar to Nov, every year- Recognize it: opposite oval leaves and HOLLOW pithA multi-stemmed arching shrub 6-20 ft tall with simple, OPPOSITE, oval leaves that come to a point. The confirming test is to snap or cut a stem thicker than a pencil: invasive bush honeysuckles have a HOLLOW brown pith, while the native shrubs they are confused with have solid white pith. Bark on old stems is grey-brown and shreds in vertical strips. Amur honeysuckle is the tallest and most tree-like; Morrow's is grey-hairy; Tatarian is smooth.
- Use the green window - it leafs out first and drops lastThe single easiest way to map an infestation is to walk the woods in late March or early April, when the honeysuckle is bright green and everything native is still bare, or again in November, when it is the last green thing standing. That extended leaf season is not a curiosity - it is the mechanism, because it shades the spring wildflowers out during exactly the weeks they need light.
- Pull seedlings and small shrubs from moist soilSeedlings and shrubs up to about an inch at the base pull whole from moist spring soil; a weed wrench or lever tool handles the next size up. Get the root crown, because a snapped stem resprouts. This is genuinely effective work for small infestations and needs no chemicals - but replant or mulch the bare ground you leave, or the seed bank simply refills it.
Key signs- Opposite oval leaves on arching multi-stemmed shrubs
- Hollow brown pith in cut stems (the confirming test)
- Green shrubs in a bare woodland in early spring or late fall
- Bare, unvegetated ground beneath established thickets
Paired tubular flowers
May to Jun, every year- Flowers in pairs from the leaf axilsIn late spring the shrub carries tubular two-lipped flowers in PAIRS from the leaf axils. Amur and Morrow's honeysuckle open white and fade to yellow, so both colors appear at once; Tatarian and Bell's honeysuckle open pink to rose. They are lightly fragrant and bees visit them, which is why people planted the shrub - but every flower pair becomes a berry pair, and every berry is a bird flight away from the next woodlot.
- Flowering is the deadline for cuttingIf you are going to cut a shrub without treating the stump, do it now rather than after the berries form, so you at least keep this year's seed out of the birds. Cutting alone will not kill it - expect a ring of resprouts - but it stops the seed crop while you plan proper control.
Key signs- Paired tubular flowers from the leaf axils
- White-aging-to-yellow flowers (Amur, Morrow's) or pink (Tatarian, Bell's)
- Which shrubs are large enough to be seed sources
Paired red berries & bird spread
Aug to Dec, every year- Red berries in pairs, and the autumn-olive confusionBerries ripen translucent red (occasionally orange or yellow) in PAIRS at the leaf axils and hang on into winter. This is where foragers get hurt: a red-berried shrub in an old field is often autumn olive, which is edible, and just as often bush honeysuckle, which is not. Autumn olive has ALTERNATE leaves, silvery-scaly leaf undersides, and berries flecked with silver. Bush honeysuckle has OPPOSITE leaves, no silver, and hollow pith. Check leaf arrangement first, every time.
- Take out the fruiting shrubs firstBirds move the seed for miles, so the biggest shrubs with the heaviest berry crops are the ones to remove first - clearing seedlings while a fruiting parent stands is wasted work. Bag berry-laden clippings into the trash rather than composting them, and keep the berries away from children and pets; they cause vomiting and diarrhea if eaten.
Key signs- Translucent red berries in pairs at the leaf axils
- Flocks stripping berries in late fall and winter
- Seedling carpets under bird perches, fence lines and canopy gaps
Winter structure & the late-season control window
Nov to Mar, every year- Cut-stump treatment in the dormant seasonLate fall through winter is prime removal time: the shrubs are visible and often still leafy while natives are dormant, the ground is firm, and cut-stump treatment works while the plant is moving reserves to the roots. Cut low and treat the fresh surface within minutes. Use a product whose label lists the site you are treating and follow that label - it is legally binding. Near water, the product must be labelled for aquatic sites, and many states require a permit or a licensed applicator.
- Plan the replanting before you clearA cleared honeysuckle thicket leaves bare, shaded, seed-loaded ground that reinvades within two seasons if nothing else claims it. Decide in winter what goes back - native spicebush, arrowwood or blackhaw viburnum, serviceberry, elderberry, chokeberry, or a woodland seed mix - so you can plant into the gap the same season you make it.
Key signs- Shreddy grey-brown bark on arching old stems
- Persistent red berries on bare twigs
- Resprout rings around stumps cut in a previous year
- Bare ground where a thicket was removed
Watch out for
4 to know. 2 are high-risk: Bird-Spread Berries & Resprouting, Understory Shading (ecological harm). 4 are active in September.
Bird-Spread Berries & ResproutingSeverity High DisordernowSeedling carpets under bird perches, fence lines and canopy gaps; new shrubs deep inside closed-canopy woodlots; a ring of stems around a stump cut in a previous season.
Seedling carpets under bird perches, fence lines and canopy gaps; new shrubs deep inside closed-canopy woodlots; a ring of stems around a stump cut in a previous season.
Kill the root crown rather than cutting alone - pull it, or cut low and treat the fresh stump within minutes. Re-walk the site each spring for several years to pull the seedling flush.
Remove the largest fruiting shrubs first to cut off the seed supply before working down through the smaller sizes; bag berry-laden clippings into the trash rather than composting them.
Why it turns up where nobody planted it, and why cutting rebuilds it: a mature shrub carries many thousands of berries that birds move for miles, the seed germinates readily in deep shade as well as in the open, and cut or mowed stems resprout from the root crown as a ring of vigorous shoots. Seedling density under a fruiting shrub or a favored perch can run into the hundreds per square yard.
Understory Shading (ecological harm)Severity High DisordernowShrubs green in the woods when everything else is bare in early spring or late fall; bare, unvegetated ground under a dense shrub layer; an absence of tree seedlings and spring ephemerals under an otherwise healthy canopy.
Shrubs green in the woods when everything else is bare in early spring or late fall; bare, unvegetated ground under a dense shrub layer; an absence of tree seedlings and spring ephemerals under an otherwise healthy canopy.
Pull small shrubs by the root crown; cut-stump-treat larger ones in the dormant season with a product whose label lists the site, following that label. Replant and mulch cleared ground the same season, or the seed bank refills it.
Never plant it. Map infestations during the early-spring or late-fall green window and remove shrubs while the stand is young and the understory still has plants worth saving.
The core hazard is ecological, and it works through timing: these shrubs break bud two to four weeks before the native canopy and hold their leaves weeks after it drops, capturing the shoulder-season light that spring wildflowers and tree seedlings depend on. Under an established stand the forest floor goes bare, native regeneration stops, and the woodlot ages out with nothing coming up beneath it.
Deer Use & Tick HabitatSeverity Medium PestnowHeavy deer bedding and trails inside honeysuckle thickets; ticks picked up while working in or walking through dense stands, particularly from late spring through summer.
Heavy deer bedding and trails inside honeysuckle thickets; ticks picked up while working in or walking through dense stands, particularly from late spring through summer.
Clear the thickets and keep the ground planted rather than bare, so it does not revert to shrub cover. Follow standard tick-removal and monitoring practice after any work in a stand.
Treat clothing and use repellent when working in stands, tuck trousers into socks, and check thoroughly afterwards. Removing the thicket is itself a long-term reduction measure.
A human-health dimension that is easy to miss: dense honeysuckle thickets provide shaded, humid cover that deer use heavily, and field studies in the Midwest and mid-Atlantic have found substantially higher densities of blacklegged ticks - and higher infection prevalence in them - in honeysuckle-invaded plots than in cleared or uninvaded ones. Removing the shrubs has been associated with reduced tick numbers on the same ground.
Toxic Berries & the Autumn-Olive Mix-UpSeverity Medium DisordernowChildren or pets near red-berried shrubs in fall and early winter; anyone picking red berries in an old field without first checking leaf arrangement.
Children or pets near red-berried shrubs in fall and early winter; anyone picking red berries in an old field without first checking leaf arrangement.
If a child eats the berries, contact Poison Control; if a pet does, contact a veterinarian. Remove the fruiting shrubs rather than relying on supervision.
Teach the opposite-versus-alternate check before any red-berry foraging, and remove fruiting shrubs from areas children and pets use.
A direct hazard with a specific route: the paired red berries contain saponins and cause vomiting and diarrhea if eaten, and this is the shrub most often confused with autumn olive by foragers, since both are scrubby red-fruited shrubs of old fields and edges. The discriminator is leaf arrangement - autumn olive has ALTERNATE leaves with silvery-scaly undersides and silver-flecked berries, while bush honeysuckle has OPPOSITE leaves, no silver anywhere, and hollow pith.
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