In these 100-degree temperatures, workers' bodies can fail to cool themselves, even with sweating. In past years across the country, nursery, greenhouse, garden center and landscape workers have actually died of heat stroke.
Consider shifting work hours to start very early such as at 5:00am when it's much cooler. Constant hydration/drinking of cool fluids is vital. Teach staff how to monitor each other. Wear wide-brim hats. Allow frequent, short breaks in shade. Encourage light, loose-fitting clothing.
For more information on heatstroke, click here.