In The Gene: An Intimate History, author concludes the Mendel's pea experiments publication by these words:
Mendel himself requested forty reprints, which he mailed, heavily annotated, to many scientists. It is likely that he sent one to Darwin, but there is no record of Darwin’s having actually read it.
What followed, as one geneticist wrote, was “one of the strangest silences in the history of biology.” The paper was cited only four times between 1866 and 1900—virtually disappearing from scientific literature. Between 1890 and 1900, even as questions and concerns about human heredity and its manipulation became central to policy makers in America and Europe, Mendel’s name and his work were lost to the world. The study that founded modern biology was buried in the pages of an obscure journal of an obscure scientific society, read mostly by plant breeders in a declining Central European town.
I wonder what could be the reason for that. If we attribute only to Mendel being a low-key monk from Brno, then still just 4 citations don't do justice given the Genetics and Heredity was arguably dawning right then.
Does it have something to do with his radical ideas - but if that is the case, then Darwin's ideas were much more challenging to the Church in my opinion. I am interested to know the possible reason(s) behind this "one of the strangest silences in the history of Biology"