I dug up my first sweet potatoes today. To be honest it was just a gamble and I wasn't expecting much to happen. A fair size and number of tubers, although it was apparent that there is a further large number of swollen roots which, given a few more months of sunshine would give a larger crop. The book said that they need at least 4 months of sun and heat - could do with a bit more. Some of the smaller ones had slug damage, but the larger ones were perfect and tasted divine. 