Scientific NameSolidago giganteae
Synonyms (former Scientific Names):
Erect perennial weed that is often 1 to 2 m tall. Sparsely branched on the upper half of the plant only.
Elliptic to lanceolate in shape 6 to 17 cm long and 1 to 4 cm wide. Leaves have short petioles and the younger leaves almost appear sessile. Older leaves will also senesce and eventually fall off. Hairs can be found along the midrib on the underside of the leaf.
This weed grows from underground rhizomes and slowly spreads. Stems are hairless and leaves are pubescent only on the underside. The inflorescence is only at the terminal and is almost panicle like. This species can be confused with Solidago altissima, Canada goldenrod, but can be distinguished by its glabrous stem unlike S. altissima which has a densely pubescent stem.
Flower Seed Head
Panicle like clusters of 10 to 20 flowers that are yellow that may be green on the tips. Each individual flower is 2 to 3 mm across.
The fruit is an achene that is 1 to 1.5 mm long and has a papus on one end. The papus looks like fibers protruding from the end of the achene.
Fallow fields, pastures, meadows, roadsides
upright and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
shorter than leaf
Stem Cross Section
round or oval