Kennelly, Megan (May 08)Jun 06, 09 · Plant potatoes in early spring after the danger of frost has passed Use diseasefree seed potatoes Potato growing success can be had with welldrained, deep, sandy loam containing plenty of humus paired with cool, moist conditions Plant potatoes in early spring after the danger of frost has passedSep 21, 17 · Several diseases affect potato plants, but the most common diseases are blight, verticillium wilt and rhizoctonia canker These diseases are easily identified and if treated early enough, the plants may be saved To help prevent blight, make sure the starter potatoes are free of disease Choose cultivars that are resistant to blight 1 Common potato plant diseases pictures