Grafting is a horticultural technique whereby plant tissues are joined together to continue growing together. The upper part of the combined plant is called the stem, while the lower part is called the rootstock.
The Ruiru 11 variety was released in 1985. The name of the variety has the prefix "Ruiru" which refers to the location of the Kenya Coffee Research Station where the variety was developed. The variety is not only resistant to CBD and CLR, but is also compact, allowing farmers to intensify production per unit of land.
According to the Cambridge dictionary, the word "Heirloom" has the following meanings:
1.- valuable object that older members of a family have given to younger members of the same family for many years.
2.- a fruit, plant or seed of a type, which has existed for many years.
From a botanical point of view, the definition of an heirloom variety establishes that this must be open-pollinated. Arabica coffee is a self-pollinated crop, so from the very beginning the definition of heirloom doesn’t apply to Arabica coffee.
Kenya is probably one of the most advanced producing countries, in the study and experimentation with the genetic diversity of Arabicas, and is far ahead of important countries such as Ethiopia for example.
On our last trip to Kenya we met the great "Dr. James", who works at the "Kenya Coffee Research Institute" station in Nyeri. In this place, he explained, how they are performing grafting of Ruiru 11 with SL 28, and the importance of its result for the future of the industry.