Inside The Nature Spirit's Grotto.
Used to kill Ghasts.
Use a Silver sickle(b)
to "Cast Bloom" option near twigs, rotten logs and certain bushes in Mort Myre swamp. Gather the resulting nature's bounty into the druid pouch (at least 3). This enables you to fight ghasts.
An empty druid pouch. (when empty)
A druid pouch (when filled).