[lawlessone]

I wonder if humans killing 4+ leaf clovers is enough of issue that they're selected against...

[sumnole]

It helps that the four leaf phenotype can be recessively carried and passed on by normal clovers.

[throwway120385]

The plant survives, even if the leaves get damaged. So it's not really selecting against them.

[hamdingers]

I'd imagine the practice of mowing introduces a lot of noise into that signal.