Talk:Birchat Ha'ilanot

In the section where we speak about which trees suit the halacha requirements, you mention "Chemdat Avraham 2:10 says it is not lechatchila but if there is no other tree you can make the Bracha" How would I know if the fruit tree I am making my Bracha on is going to carry fruit this year or not? It is a chance one has to take, isn't the question rather about after the fact, meaning I have made a Bracha on a fruit tree that I have now seen didn't carry fruit this year, was my Bracha valid or not?