You might have noticed that there are fewer varieties here than there used to be.  Since 2016, we dropped all of the heirloom ulluco varieties that we carried.  Many of those varieties were carrying viruses and the cost of testing and cleaning them would just have been too high.  They posed a risk to our breeding program, since we don’t want viruses from the heirlooms infecting our new varieties.  All of the varieties now appearing in the catalog are new, produced here from true seed.  I strongly recommend that you do not grow these varieties near varieties obtained from us before 2016 or from any other source, as it is overwhelmingly likely that those older varieties carry one or more viruses.