Canada

Biennial wormwood

Artemisia biennis

Stems & Roots: Stems erect, little or not branched, 10-150cm (4-60in.) tall or occasionally much taller, smooth, hairless, firm; first leaves of young plant in a basal rosette, short-stalked, pinnately divided and redivided, the final divisions coarsely and sharply toothed; stem leaves similar to basal leaves but usually only once-divided with each division coarsely and sharply toothed, alternate (1 per node); by flowering time the lower stern leaves usually dying, and the basal rosette of leaves gone, only their scars remaining
Flowers & Fruit: Flower heads greenish and inconspicuous, clustered on many short branches in the axils of small leaves towards the top of the stem, forming a slender, elongate inflorescence; each individual flower head very small, about 2mm (1/12in.) across, yellowish-green, without ray florets; seeds numerous and very small. Upper leaves, stem and flower heads, and to a lesser extent the basal leaves, when crushed have an odour resembling a combination of sage and carrot. Flowers from August to October.
Habitat: Biennial wormwood occurs throughout Ontario in old fields, waste places, fence lines, meadows, around buildings, and occasionally in cultivated land.

Pesticides
Distinct
intensity: ★★★
Glyfo Silvi
intensity: ★★★
Marksman
intensity: ★★★
MON 76429 Liquid
intensity: ★★★
MON 76431 Liquid
intensity: ★★★
Overdrive
intensity: ★★★
Powermax Liquid
intensity: ★★★
Restore II
intensity: ★★★
Roundup Ultra Liquid
intensity: ★★★
Roundup Xtend with VaporGrip Technology
intensity: ★★★
XtendiMax with VaporGrip Technology
intensity: ★★★
2,4-D Amine 500
intensity: ★★
2,4-D BEE-4
intensity: ★★
2,4-D LV-600
intensity: ★★
2,4-D LV-700
intensity: ★★
Albaugh 2,4-D Amine 600
intensity: ★★
Boost M
intensity: ★★
GF-2654 TC
intensity: ★★
GF-2654 TSOY
intensity: ★★
GF-2726 TSOY
intensity: ★★
MCPA 2 EH Ester 600
intensity: ★★
MCPA Amine
intensity: ★★
MCPA Amine 600
intensity: ★★
MCPA Ester 500 LV
intensity: ★★
MCPA Ester 600
intensity: ★★
MCPA-K
intensity: ★★
Rexade B
intensity: ★★
2,4-D Ester 700
intensity: ★
2,4- D Ester 700
intensity: ★
Adrenalin SC
intensity: ★
Albaugh MCPA Ester 600 Liquid
intensity: ★
Formula 40 C
intensity: ★
Plus M Ester 600
intensity: ★
Stellar B
intensity: ★
Albaugh 2,4-D Amine 600 Liquid
intensity: N/A
Engenia
intensity: N/A
Fexapan Plus Vaporgrip Technology
intensity: N/A
GF2050
intensity: N/A
GlyKamba
intensity: N/A
M1691
intensity: N/A
Reclaim II A
intensity: N/A
Reclaim II B
intensity: N/A
Renegade HC Liquid
intensity: N/A