breeding ground
fertile ground

Already his seed might have met fertile ground in her.

But what makes the university such a fertile ground for brilliant ideas?

That always seemed to me to be equally fertile ground.

Could there be any more fertile ground for a series to mine?

Now the times have changed, and Midtown is fertile ground.

In a normal democracy, that would not provide fertile ground for a political crisis.

Germany in the 1920s and 30s was fertile ground for such ideas.

So there's a long history in Colorado, and it's fertile ground.

"These issues are dangerous because they give the extremes fertile ground."

Parents who go with their children will find the movie fertile ground for discussion.