the.com/seedbed

means A layer of soil prepared to germinate seeds before young plants are transplanted elsewhere — and by extension, any environment that nurtures the early growth of something, like ideas or movements.

from Straightforward Old English-rooted compound: 'seed' plus 'bed,' the literal patch of earth gardeners prepare and sow before seedlings are strong enough to move outdoors. The figurative sense — a seedbed of revolution, of talent, of ideas — grew naturally from the gardening image, the metaphor spreading sometime after the literal horticultural term was well established.