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Kudzu
'The vine that ate the South' - one of the most destructive invasive plants in North America, smothering forests and buildings at up to a foot a day. Never plant it; this entry is for identifying and controlling it.
Safety notes Kudzu's root starch ('Japanese arrowroot'), young leaves, and flowers are edible in Asian cooking. For the plant in the garden, the hazard is ecological and legal rather than toxic: it is a listed noxious weed in many states where planting or transporting it is illegal. Do not plant it; forage only unsprayed stands (many are sprayed), watch for poison ivy growing through it, and never spread a root or stem fragment. Concentrated root supplements are a separate question - see Medicine.
Overview
Kudzu (Pueraria montana) is the infamous invasive vine that has come to symbolize ecological invasion in America - 'the vine that ate the South.' A vigorous climbing legume from East Asia, it grows explosively in warm climates (up to a foot a day in summer), blanketing trees, fields, fences, buildings, and whole hillsides in solid green sheets, shading out and killing everything beneath it. It's a listed noxious weed in many states, where planting, selling, or transporting it is illegal.
This entry exists to help you recognize and control kudzu - never to plant it. It's worth knowing, honestly, that kudzu is not evil in itself: in its native Asia it's a valued plant, and even in North America its roots, young leaves, and grape-scented flowers are edible (the root yields a fine starch, 'Japanese arrowroot') and it has traditional medicinal uses. But in the American landscape it's a catastrophic invader with no natural checks, and the responsible response is to identify it, control it, and above all never introduce or spread it.
Quick facts
For identification. Not a growing guide.
- Height
- 50 ftRange: 10–100 ft
- Spread
- 50 ftRange: 10–100 ft
- Cold
- Takes hard frostdamaged below -10°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, 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
Explosive growth (identify & control)
Apr to Sep, every year
Know this stage
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Recognize it: leaves of three, foot-a-day growth
Kudzu is a fast, hairy, climbing/sprawling vine with large compound leaves of THREE broad, often lobed leaflets. In summer it can grow up to a foot a day, blanketing trees, fences, and hillsides in a solid green sheet. A vine smothering everything in its path is likely kudzu. Poison ivy is also trifoliate and grows through kudzu mats: kudzu leaflets are large (to 4 in), dull, and hairy; poison ivy leaflets are smaller, glossy, and hairless above - confirm every leaf before you pick it.
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Control it - do not let it establish
Kudzu is extremely hard to remove once established (it stores energy in huge tuberous roots). Control means persistent grazing, repeated close mowing/cutting, or targeted herbicide over multiple years - and digging out the root crowns. Never let it set seed or root at the nodes, and never plant it.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Invasive Smothering (ecological harm)Severity High DisordernowSeason: Apr–OctVines rapidly blanketing and killing trees, shrubs, fences, and buildings under a solid green sheet.
Vines rapidly blanketing and killing trees, shrubs, fences, and buildings under a solid green sheet.
Multi-year control: repeated cutting/mowing, grazing, targeted herbicide, and root-crown removal; report new infestations to authorities where required.
NEVER plant it; remove small new infestations immediately before they establish; check local noxious-weed rules.
The core hazard is ecological: kudzu grows so fast and dense that it smothers and kills native trees, shrubs, and whole plant communities, and overwhelms structures - one of the most destructive invasives in North America.
Regrowth from Roots & FragmentsSeverity High DisorderSeason: Mar–SepVigorous resprouting after cutting, rooting where stems touch soil, and new plants from dumped fragments.
Vigorous resprouting after cutting, rooting where stems touch soil, and new plants from dumped fragments.
Sustained control over several years to exhaust the roots; dig out root crowns; combine methods and persist.
Never spread stem/root fragments; bag and dispose of material properly (don't compost or dump); clean equipment.
Why it's so hard to kill and why it spreads: kudzu resprouts vigorously from its huge tuberous roots, roots at every stem node, and can start anew from fragments - so cutting alone fails and careless disposal spreads it.
Grower tips
Notes from growers, tagged with the zone they grow in. A person reads every post before it appears.
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