Northern Willowherb

(Epilobium ciliatum Raf.)

Hairy Willowherb

(Epilobium hirsutum L.)

Herbicides | Description

Habit

Epilobium habit [Top]

Inflorescence

Epilobium nflorescence [Top]

Stem

Epilobium ciliatum stem [Top]

Leaf margin

Epilobium ciliatum leaf margin [Top]

Habit

Epilobium hirsutum habit [Top]

Herbicide Effectiveness [top]

Key to Rankings

Barricade/Regalkade

P

Broadstar

?

Gallery

P

OH2

P

Pennant Magnum

?

Pendulum

?

Regal OO

P

Ronstar

G

Rout

?

Showcase

?

Snapshot TG

P

Surflan

?

Treflan

?

Description [top]

These two Willowherb species (Onagraceae) are annuals that are more common in cool regions, but occur occasionally as a cool-season weed in warmer areas. Seedlings are small and slow to establish, but once established, plants elongate to 18 inches tall. Stems are winged, and leaves are opposite, lack petioles and are deeply veined. Leaves and stems of hairy willowherb are densely hairy. Flowers are pink. Long seed pods split open to release many wind-dispersed seed. This weed is becoming more prevalent in container nurseries, likely spreading in contaminated nursery crops. Inspect liners to prevent introduction. Prevent plants from going to seed in or near production areas. Willowherbs are not well controlled by herbicides currently labeled for use in container nursery crops. Herbicide efficacy rankings for this species are based on limited experimental data. [TOP]