When you periodically heal with your Rejuvenation or Lifebloom spells, you have a 20% chance to instantly regenerate X% of your total mana. This effect cannot occur more than once every 12 sec.
In addition, you also grant Replenishment when you cast or refresh Lifebloom.
Replenishment - Grants up to 10 party or raid members mana regeneration equal to 1% of their maximum mana per 10 sec. Lasts for 15 sec.
When you periodically heal with your Rejuvenation or Lifebloom spells, you have a 20% chance to instantly regenerate X% of your total mana. This effect cannot occur more than once every 12 sec.
In addition, you also grant Replenishment when you cast or refresh Lifebloom.
Replenishment - Grants up to 10 party or raid members mana regeneration equal to 1% of their maximum mana per 10 sec. Lasts for 15 sec.
Revitalize (formerly Replenish) is a talent in the Restoration tree, you will need to spend 43 points in restoration tree to max it.
Edit
Patch 3.1.0 (2009-04-14): Replenish is now re-named "Revitalize" and now also works with Wild Growth. 
