fecund

adjective2

1. •
   (formal) Highly fertile; able to produce offspring.

   • The druids […] believed that mistletoe could make barren animals fecund, and that it was an antidote to all poisons. — 2014
2. •
   (figurative) Leading to new ideas or innovation.

   • This idea of Aristotle's has proved marvellously fecund; and in truth it is the only idea covering quite the whole area of cenoscopy that has shown any marked uberosity. — 1906