The best tactic with all annuals, whether shaggy soldier, hairy bittercress or grass, is to be vigilant.

The culprit was shaggy soldier, or Galinsoga quadriradiata, and it was spreading madly.

G. quadriradiata (synonym G. ciliata) is also called "shaggy soldiers".

Galinsoga quadriradiata is a species of flowering plant in the daisy family which is known by several common names, including shaggy soldier, hairy galinsoga, and fringed quickweed.

In the United States it is called "hairy galinsoga".

I watched for a minute or two, hoping the woodchuck would move on to some hairy galinsoga, another persistent weed.

Galinsoga quadriradiata is a species of flowering plant in the daisy family which is known by several common names, including shaggy soldier, hairy galinsoga, and fringed quickweed.

Galinsoga quadriradiata is a species of flowering plant in the daisy family which is known by several common names, including shaggy soldier, hairy galinsoga, and fringed quickweed.

Galinsoga quadriradiata (I)