Marie Jasieniuk is a professor with the Dept. of Plant Sciences at UC Davis. A major pathway of introduction of non-native invasive plants into new geographical areas is the global horticultural trade in ornamental plants.
I wanted to give a shout-out to a recent blog posted by Tunyalee Martin with UC IPM. The blog post announces a new online interactive tool for controlling wildland weeds with non Chemical methods.
Common Purslane Biology Steve Fennimore, Extension Specialist UC Davis July appears to be the period of maximum emergence of common purslane (Portulaca oleracea) see figure 1 attached. Purslane is considered a summer weed with peak emergence occurring during warm weather.