On Jul 11, 2010, vossner from Richmond, TX (Zone 9a) wrote:
Definitely a weed in my garden. Grows in pots, in every sidewalk crack, even amidst the lawn. Rain and moist locations seem to make it flourish. Insignificant flower. Easy to remove, but it comes back.
On Sep 4, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:
This plant is a U.S. native and grows in many states. It is listed as invasive in this reference: Whitson, T.D. (Ed.) et al. 1996. Weeds of the West. Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming. Laramie, Wyoming. 630pp.