Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
seed [siːd] n се́мя*nt
seeds (fig) семена́*ntpl
he is the number 2 seed (SPORT) в ранжиро́вке спортсме́нов он второ́й
to go to seed (plant) пойти́*(perf) в семена́ (fig) сдать*(perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.