I bought a smaller Kwanzan cherry tree like the ones that are in a rack and at the stores in the spring with the big plastic bag filled with soil. I wanted some color and flowers in the spring. This year I bought a flowering crab apple same place. Of course they are both grafted. I would like to air layer some low branches on the Kwanzan and the top out of the crab apple. Has anyone tried this and been successful? Any suggestion would be appreciated. Thanks.