Wikia

Nature's Grace
You gain X% spell haste after you cast Moonfire, Regrowth, or Insect Swarm, lasting 15 sec. This effect has a 1 minute cooldown. When you gain Lunar or Solar Eclipse, the cooldown of Nature's Grace is instantly reset.
Usable by
Class	Druid
Properties
Location	Balance, Tier 1
Affects	Spell Haste
Ranks	3
Requirements
Points required	0
Spec specific	Yes
Talent required	None

Nature's Grace is a tier 1 balance druid talent.

Rank table

Spell critical strikes caused by Hurricane do not proc Nature's Grace.
Nature's Grace will no longer refresh itself constantly if you continue to crit; there is now a 1 minute cooldown.
The 15% haste effect affects your GCD, but follows the same rules as regular haste rating, i.e. the GCD can not be less than 1 second.
The Nature's Grace effect occurs when a spell that will crit has finished being cast, meaning that wraths that are still travelling to the target, but are predetermined critical strikes, will proc Nature's Grace before the damage is dealt to the target.

Nature's Grace is a very significant source of DPS for a balance druid specc.
Though the earlier form of Nature's Grace was preferred by Restoration specced druids, this talent can still prove useful for healing.

Patch 3.1.0 (14-Apr-2009): Changed from 0.5 sec reduction in cast speed to 20% cast speed increase for 3 sec.
Patch 3.0.8 (2009-01-20): Now also affects Revive.
/ Patch 3.0.2 (14-Oct-2008): Now also reduces the global cooldown of your Wrath spell by 50% while in effect.