As Accord said, the Druid Grove is the PC Druid stronghold quest. However, when you first show up (when the grove is still under control of the "bad people") and run into the Grand Druid, you have the option of volunteering Jaheira to fight for control of the Grove. However, she doesn't get to keep the grove...I don't think. You can just get more XPs than if you have Cernd do it.
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The only good giant is a dead giant!
---Throntar the Battlerager---