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Autumn Olive
An invasive shrub that forms dense thickets and alters the soil by fixing nitrogen - even though its berries are genuinely edible. Never plant it (edibility is no excuse); this entry is for identifying and controlling it.
Safety notes Not poisonous - the speckled red berries are genuinely edible (tart, lycopene-rich 'autumnberries'), seeds and all. That is NOT a reason to plant or keep it: it is a serious invasive, and it is banned outright in some states. If foraging an existing stand, confirm the silver scales: red-berried shrubs with opposite leaves are bush honeysuckle, whose berries make you sick. Skip roadside and right-of-way stands - those corridors are sprayed. Never plant or spread seed or cuttings.
Overview
Autumn olive (Elaeagnus umbellata) is a fast-growing, thicket-forming invasive shrub across the eastern US, Midwest, and Southeast - and a good example of an honest paradox: its berries are genuinely edible and even nutritious, yet it must not be planted. Introduced from Asia and once widely promoted for wildlife and erosion control, it escaped to invade old fields, pastures, roadsides, forest edges, and open woods, forming dense thickets that crowd out native plants.
It has a special trick that makes it more than an ordinary weed: as a nitrogen-fixer, it enriches the soil it grows in - which sounds good but actually alters soil chemistry in ways that favor more invaders and disrupt native plant communities adapted to leaner soils. It spreads prolifically by bird-dropped seed. The edible berries (tart, lycopene-rich 'autumnberries' beloved by foragers) are real - but foraging an existing stand is very different from planting one, and 'it's edible' is no reason to keep a serious invasive. This entry is here to help you recognize and control autumn olive (and forage it responsibly if you wish), and to point you to native berry shrubs instead. Never plant it.
Quick facts
For identification. Not a growing guide.
- Height
- 14 ftRange: 6–20 ft
- Spread
- 12 ftRange: 5–20 ft
- Cold
- Takes hard frostdamaged below -30°F
- Heat
- Struggles above 105°F
- Life cycle
- Perennial, lives about 40 years
- Self-sows
- Yes. Never let it set seed.
- Habitat
- Full sun · Part sun · Part 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
Silvery thicket growth (identify & control)
Apr to Oct, every year
Know this stage
-
Recognize it: silvery-backed leaves, speckled twigs
Autumn olive is a fast, spreading shrub with oval leaves that are dull green above and distinctly SILVERY-SCALY underneath - a flash of silver when the wind turns them is the giveaway. Young twigs are silvery to golden-brown and speckled with tiny scales, sometimes with scattered thorns. It forms dense multi-stemmed thickets on open, disturbed ground. Silvery leaf undersides plus a fast thicket habit point to autumn olive.
-
Pull seedlings, cut-stump-treat larger shrubs (it resprouts)
Pull or dig seedlings and small shrubs when soil is moist, getting the roots. For larger shrubs, cut and immediately treat the cut stumps with herbicide, or use basal-bark treatment - cutting or mowing alone triggers vigorous resprouting. Prioritize removing fruiting shrubs to stop bird-spread seed. Bag berries; never let seed or cuttings spread.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Smothering Thickets (ecological harm)Severity High DisordernowSeason: Apr–OctDense stands of small-leaved semi-evergreen shrubs choking woodland understory, fencerows, and streamsides, especially green thickets in the winter woods.
Dense stands of small-leaved semi-evergreen shrubs choking woodland understory, fencerows, and streamsides, especially green thickets in the winter woods.
Dig or hand-pull small plants (get the roots), cut-stump or basal-bark herbicide on larger stems, treat regrowth, and replant with natives; cutting alone causes vigorous resprouting.
Never plant it; remove seedlings and small clumps early, and take out fruiting shrubs before birds spread the seed.
The core hazard is ecological: autumn olive forms dense, fast-growing thickets on open and disturbed ground - old fields, pastures, edges, and open woods - that crowd out native grasses, wildflowers, shrubs, and tree seedlings, degrading habitat.
Bird-Spread Seed & Root SuckeringSeverity High DisordernowSeason: Aug–DecSeedlings appearing far from any planting, carpets of seedlings under mature shrubs, and vigorous resprouting after cutting or mowing.
Seedlings appearing far from any planting, carpets of seedlings under mature shrubs, and vigorous resprouting after cutting or mowing.
Address both seed source and roots: remove fruiting shrubs, dig or cut-stump-treat clumps to kill the roots, and follow up for several seasons against the seed bank.
Remove fruiting shrubs to cut off the seed supply; never compost or dump berry-laden clippings; clear seedlings before they mature.
Why it spreads so far and resists control: autumn olive produces huge crops of berries that birds scatter widely, seeds germinate readily in disturbed ground, and cut shrubs resprout vigorously from the stump.
Soil Alteration by Nitrogen FixationSeverity Medium DisordernowSeason: Apr–OctAutumn olive establishing on poor, infertile ground, followed by flushes of weeds and other invaders in the enriched soil.
Autumn olive establishing on poor, infertile ground, followed by flushes of weeds and other invaders in the enriched soil.
Remove the shrubs and monitor the site for follow-on weeds; restore with natives suited to the (now altered) soil.
Remove autumn olive before it establishes and enriches the soil; avoid planting it on reclamation or lean sites.
A subtler ecological hazard: as a nitrogen-fixer, autumn olive enriches the soil with nitrogen, disrupting native plant communities adapted to lean soils and favoring other weedy invaders - so its impact persists and can degrade a site beyond the shrub itself.
Grower tips
Notes from growers, tagged with the zone they grow in. A person reads every post before it appears.
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