fertile in WordNet English dictionary

1. marked by great fruitfulness
   "fertile farmland"; "a fat land"; "a productive vineyard"; "rich soil"
   fat  fertile  productive  rich 
   
2. intellectually productive
   "a prolific writer"; "a fecund imagination"
   fecund  fertile  prolific 
   
3. capable of reproducing
   fertile 
   
4. bearing in abundance especially offspring
   "flying foxes are extremely prolific"; "a prolific pear tree"
   prolific  fertile