Druid · Restoration · tier 6 · from level 35 · needs 3 points in Improved Rejuvenation
Improved Regrowth
+504 Regrowth
5/5 · level 60 · per cast
Improved Regrowth
Rank 5/5
Increases the critical effect chance of your Regrowth spell by 50%.
Averages, counting crits and misses, for a level 60 Druid with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.