The success of the grafting experiments between C. sativa and the two Humulus species is thus consistent with their close botanical relationship. C. sativa strains however, continue to produce essentially their own characteristic mixture of cannabinoids whether they are grafted with other strains of the same species, or with the two Humulus species, and whatever part of the graft system they form. There is no evidence of loss of vigour in the quantitative production of cannabinoids in the grafts–if anything, the reverse.
Well. That sounds awesome. And here’s one way to do it.
Seedlings of the two species to be grafted were planted side by side, and when they were about 4 weeks old a diagonal cut was made approximately half-way through each stem, at the same level. The cut portions were slipped in to each other and the joints held with adhesive cellulose tape. After 1-2 weeks the unwanted top portion was cut away, followed in a few days by the unwanted lower portion, thus completing the graft. At least 20 specimens of each graft-type were made. The successful graft-types are shown in Table I and include inter-race Cannabis grafts as well as Cannabis/Humulus types. Success rates were > 30%, considerably higher if the grafts were made early in the season (May-June). All successfully grafted systems continued to grow well, and the Cannabis upper parts flowered in both male and female cases, the latter fruiting. Differences in stem diameter between C. sativa and H. japonicus and H. lupulus presented no barrier to satisfactory union.