Grafting and Interspecies Trees

Is it permissible to create a "fruit salad" tree? Would one need to take separate terumah and maaser from each fruit? Can you make shehechiyanu and birkat hailanot on the tree?

Grafting is permissible the scion and rootstock are מין במינו; what is considered the same species?

Why is grafting prohibited? What are the hashkafic issues in grafting - are we trying to change God's creations?

Trees need to be inspected before being planted to ensure they are not grafted.

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Delivered at the OU Israel Center, January 16th, 2019, 10 Shevat 5779

This shiur is sponsored by David and Ziva Katz in Loving Memory of David's Father, Isaac Katz z”l