Regrowth

An altogether decent spell to cast by itself, talented and glyphed this spell is a power house.

Glyph of Regrowth + 20% initial heal
Improved Regrowth (Talent) + 50% critical chance, triggering Nature's Grace and Living Seed
Nature's Splendor + 6 sec. hot duration (27 sec total)
Mana reduction talents from Tree of Life and balance (Moonglow).
And of course, it can be made instant with Nature's swiftness and be consumed for Swiftmend.

I haven't looked to closely at the wrath idols, but I'd expect there to be one to improve Regrowth somehow.

Very nice HoT spell especially at higher levels. You can use it before aggroing a foe so that you keep your health high during the fight.

This spell is a tool, it should only be cast during Clearcasting, and to trigger Nature's Grace.

When Regrowth crits, is the HoT component increased as well as the direct-heal component?

Regrowth gains ~100% of your Bonus Healing, and is broken down into two parts:

• The direct part of your heal gains ~30% of your Bonus Healing
• 
  
• The HoT part of Regrowth gains ~70% of your Bonus Healing
• 
  

And since I believe the coefficient of DoTs are broken down evenly over time, each tick of Regrowth gains 10% of your Bonus Healing (since the HoT ticks every 3 secs for 21 secs, which is equal to 7 ticks)

This spell can trigger Harmony because it's technically a direct heal and a HoT. Tested 10/19/11 in heroic ZA.

Since Patch 2.4 the tables have turned and Regrowth is now one of the druid's most efficient healing spells. How ironic. See the comments here for details.

How ironic, with patch 4.0.X, the initial 2.0.1 post is valid once more. The wheel turns again...

I'm pretty sure that regrowth is now by far the worst healing spell in the game. All the other healing class quick spells have base healing around 7k. Regrowth barely reaches 4k and it costs 35% base mana, while the others cost about 27%. You have to take 3 point talent to make it even the slightly bit good (Nature's Bounty: +60% regrowth crit chance). Please correct me if I'm wrong. I would love to be wrong about this.

With moonglow, it is now 614 mana. This makes regrowth the second most efficient heal for a druid, after lifebloom. Nice buff!

It looks like Blizzard has finally recognised that all healing classes do need a Flash Heal style heal with a rapid casting time. With the latest few changes the efficiency still looks bad if you're over-writing the HoT, but with Imp Regrowth and the average bonus heal from its frequent crits it starts to compare quite well with Flash and Lesser Healing Wave.

All of which makes druid healing just that bit easier for Resto druids.

Regrowth no longer receives a +50% crit chance via talents. That particular talent was renamed and now only grants 25% crit chance bonus. In addition, The new talent (Nature's Bounty) also increases the critical effect chance of Nourish by 25%. If you add in the new Nourish Glyph (Glyph of Nourish), Nourish becomes a far more superior spell to regrowth spam, given the nerfs to Regrowth crit and the buffs to Nourish Crit+Healing.

Restoration druids in Cata:

Note that Insect Swarm is considerably cheaper than Moonfire or the very expensive Regrowth. Use your free haste trinket (1-minute cd) from Nature's Grace wisely while you wait for Tree of Life (3-minute cd) to become available.

No, the Healing over Time component is the same, crit or not. Whether it does or not, however, it is still an efficient spell to use (Provided many of the ticks are actually used and don't become overhealing). Being able to pick up Improved Regrowth, however, insures you're able to downrank more effectively and conserve more mana, even if the healing over time isn't used to its fullest extent.

Glyph of swiftmend will help this out too.

You're completely failing to realize the reason why a quick heal exists -- to heal someone that would die otherwise, buying time for a better heal. There are a few reasons why regrowth fails at this: The heavy reliance on RNG pretty much makes the skill terrible for this. This skill is completely capable, even with talents and mastery galore, of healing for all of 6k damage for over 6k mana. If your target could live in the cataclysm dungeon/raid environment with 6k hp, the chances are very high he could have lived with the HP he had before the heal, and you could have cast a better heal.

The spell power coefficent of the direct heal, and heal of time is as follows:
DH-approx 54%(64.8% with Empowered Rejuvenation)
HOT-131.6% (157.9% with Empowered Rejuvenation)

http://www.wowwiki.com/Spell_power_coefficient

Nourish and Healing Touch cannot match a properly specced and glyphed Regrowth for a PVE tree in terms of HPM, HPS, initial heal, and added HOT.

Regrowth has:
- a 50% chance to crit (Improved Regrowth), which will proc Nature's Grace and Living Seed
- heals for 20% more if Regrowth HOT is still present on the target (Glyph of Regrowth)
- HOT benefits from Empowered Rejuvenation, Genesis, and Nature's Splendor

which unfortunately cannot be matched by Nourish.

There is still an optional place for Nourish as a small heal to avoid overhealing and waste of mana, but it definitely cannot replace Regrowth as the big heal.

(I do not mention HT much, as glyphing and speccing for this is primarily for PVP, which is a different concern altogether.)

I'm sorry to disagree, but while that is the purpose of a quick heal that example is terrible. For that particular raid situation you have much better tools: if you don't have swiftmend off cooldown or nature swiftness ready for a healing touch, you may need to check your timing. Also, if you need a HoT effect on target for your emergency swiftmend this spell is the best choice, the cast time is the same as the global cooldown, they'll land at the same time. And that is a terrible example by the way it's stated even - if it fails to save it's because it heals too little, but if it saves you c

You might be rethinking this as of 3.1 with the 4pc Tier bonus with the new glyph of nourish with 4 HoTs Regrowth, Rejuv, LB, and WG... that's a Nourish +44% bonus.

FYI if you actually read Gift of the Earthmother it says Rejuvenation not Regrowth.

I am sorry. I do NOT think you are wrong. Nourish used to be our Flash heal, Flash of light and Healing surge...and it was great, could not complain...but now...Why on earth could they not make THIS...make Regrowth the mana saving one, and kept Nourish like it used to be.

When a direct spell with a dot/hot on it, only the DD part gets increased.

ye, its very usefull in pvp.

As it stands (calculating averages with criticals), a restoration druid should find this to be their number one skill now for their first cast, it used to be quite mana inefficient compared to other skills and mostly for emergencies // focus healing, but with the new buff this skill is going to be pretty amazing, especially when I already am forced to spam this skill for certain fights (Such as Naj'entus, where it is extremely important). Expect to use this spell as frequently as lifebloom come 2.4.

Regrowth is a powerful healing spell, however is relatively mana inefficient. Use this when you want to "forget" about a player for a bit or when you need to keep a constant stream of healing on a person.

One situation where Regrowth shines is in the Vael fight in BWL. Just spam this - it's great due to its shorter cast time and its constant healing.