[If] someone trains a grapevine onto part of a fruit-bearing tree, it is permitted to bring seed under the remainder. And if the new growth extended out, he must return it. It happened that R’ Yehoshua went to R’ Yishmael in Kfar Aziz, and he showed him a grapevine trained onto part of a fig tree. He said to him: May I bring seed under the remainder? He said to him: It is permitted. And he took him from there up to the house of Hamganyeh and showed him a grapevine trained on part of a beam and the stump of a sycamore with many beams. He said to him: Under this beam it is forbidden, but [under the] rest it is permitted.