Shehechiyanu on Grafted Fruit

Hi,

If trees of different species are grafted in a manner which violates Jewish law, the fruit they produce is still permitted. However, one should eat the fruit in a way which will not require a Shehechiyanu blessing (ie eating them with another new fruit), to avoid making a berachah expressing joy at this sin.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 2:58)

Have a great day,
Mordechai