Parentless seeds...

I try to collect parentless seeds of the white clover, but there are none at the moment, because some people breed them and abandon.

Trashing helps a little bit, but I'm limited to 3 at a time only. Could this limit be raised bit or could you manually make the PARENTLESS clover drop in the garden?

The problem is some people abandon numerous bred seeds and therefore the parentless ones are not present (available) in the garden. And I can trash only 3 a week, so it takes a lot of time to get rid of those bred ones...