Secret of success is the humble potato! Before planting cuttings, he pushes the bottom end into a small potato, which he believes keeps the cuttings moist as they develop roots. It sounds crazy, but his row of allotment roses is proof it works.
Ten Mistakes Herb Gardeners Make (and How to Avoid Them!) - my favorite quote from this "herbs are kind of like college boys: if you give them half a chance, they will focus all their energy on procreation and neglect growth" - good advice