kudzu

Pueraria montana var. lobata

   

Family: Fabaceae

Weed Class: A

Year Listed: 2003

Native to: Asia and the Pacific

Toxic: not known to be

Other Legal Listings: WA Quarantine list, WAC 16-750

additional photos

 

   

Why is it a noxious weed?

It is a highly aggressive invasive plant which is extremely difficult to control once established. Kudzu is so aggressive it covers and smothers all other plants in its path, resulting in solid single species stands eliminating native species.

How would I identify it?

General Description: It is a perennial, trailing vine which may grow up to one foot a day. Dense stands of kudzu are characterized by thousands of single-colored plants covering everything in their range.

Flower Description: Purple to purplish-red flowers are clustered in axillary racemes up to one foot long. Each flower is pea-like and ½ to ¾ inch. Flowers are fragrant and described as grape-like.

Leaf Description: Leaves are alternate and compound with three oval to nearly heart-shaped leaflets, each three to four inches long. They are dark green and may be entirely or slightly lobed. Leaves and stems are hairy.

Stem Description: Vines may grow as long as 98 feet. A single root crown may produce as many as 30 vines which become somewhat woody and expand out in all directions.

Fruit/Seed Description: Kudzu typically flowers and forms seedpods on climbing vines. Seed pods produce small amounts of viable seed. Seed pods are flattened, brown and hairy and are around 2 inches long.

May be confused with:

How does it reproduce?

Reproduction by seed is believed to be minimal. Most reproduction is by vegetative reproduction of vines which root at every node, forming root crowns that then send out new growth and create extensive plant coverage within one year.
 

Where does it grow?

Kudzu grows best in well-drained degraded or eroded land or in disturbed, sandy, deep loam soils in full sun. It will, however, invade well-drained acid-soil forests as well as the floor of a closed canopy forest. Please click here to see a county level distribution map of kudzu in Washington.
 

How do I control it?

General Control Strategy

Control of well established kudzu stands can take up to 10 years. Persistent treatment of patches is the only true control measure.

Mechanical Control

Mechanical control methods require enormous persistence since the goal is to deplete the rootstocks of stored food and prevent replenishment through the photosynthesis of above ground vegetation.

Biological Control

Kudzu produces forage, which is palatable to livestock. Studies have found that goats may provide a viable alternative to chemical control.

Herbicide Control

There are several chemical methods for control of Kudzu, please refer to the PNW Weed Management Handbook, or contact your county noxious weed coordinator.


 

For more information

 
See our postcard for early detection information about kudzu.
See our Written Findings for more information about kudzu (Pueraria montana var. lobata).

Additional Photos


 
 

 


Kudzu vine growth

 


Kudzu infestation

 


Kudzu flower cluster

 


Kudzu leaf

 


blooming inflorescence

 


cut stems

 


hairy seed pods

 


blooming flowers

 


both sides of leaves

    

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