Testing was successful and efforts are being made to develop more practical methods of harvesting, singeing, and feeding pricklypear as a winter supplement. Cincinnati Hay Fever. Too Tough to Die. Workmen waited 2 weeks between applications of the first and second coats of asphalt in the parking lot at the Amchem Products, Inc. research farm, Dallas Center, Iowa, a few years ago. When they returned to apply the second coat, they were amazed to see that several weeds, including milkweed and nettles, had popped up through the first 1-inch layer of blacktop.
Thistles also have flowers.