According to the "authentic" Hadith compilation of Muslim (Sahih Muslim), on Judgment Day the Muslims will kill all the Jews, who will of course try to avoid being killed by hiding. But every stone, every tree, will cry out "there's a Jew behind me" and let the Muslims know where to find them. Only one tree will not do so, will thereby protect the Jews. And that's the Gharqad tree. And, diabolically, in order to thwart the will of Allah and to protect themselves, Jews are -- Ali Gomaa assures us it is true, and he does believe -- diabolically planting those Gharqad trees.
The expected spectacle, here.