In the ensuing years, his fortune improved. The viral strand genetically rewrites the host's cells, re-purposing it to suit its needs. Once it's done, plan for maintenance once a year or as needed twice a year on floors. Provides Nitrogen, Potassium, Calcium and trace elements. Department of Agriculture defines eight official classes of wheat: durum wheat, hard red spring wheat, hard red winter wheat, soft red winter wheat, hard white wheat, soft white wheat, unclassed wheat, and mixed wheat.