I have a piece of land in Spain (La Rioja) where I planted 40 walnut trees. There are 3 different groups, in order to test which one of them are the proper species to the area. They are appearing some hybrids and it seems that some of them are the best ones. I read that it is posible to get clones from those using some MS (Murashige & Skoog) liquid. Do you now how can I get this product in a little quantity by an internet supplyer?. Any proposal will be welcome. If you have any walnut tree in your area I am also interested in knowing the specie type.