A Better Solution to Mildew and Blackspot on Roses

There are gardeners in bits of the country who find that the air is always so dry and the sun so bright that any rose they plant will thrive and not be touched by any fungal disease. But not all of us can live where the air is dry.  After three years of living in the mountains of Arizona, where the relative humidity hovers around 20 percent through most of the growing season, going up to about 60 percent in July and August, I know that even here it is important to be effective at battling fungal disease. Continue reading