seedbed; nursery bed; seed-plot
A plot of soil prepared for raising seedlings before transplanting them. Also used metaphorically for a place where something develops or originates.
When spring comes, I sow tomato seeds in the seedbed.
This region has become a nursery for new talent.
When spring comes, I'll make a seedbed in the corner of the field.
I sowed tomato seeds in the seedbed.
That organization had become a breeding ground for crime.