Pull up 7 Whisperwind Lashers to check them for corruption.
In a place like this, even something as simple as growing flowers and pulling weeds can require some heroic effort.
The orchid lashers that grow on all sides of the grove are a sign of healing. But they're not flawless; some of them do succumb to demonic corruption now and then.
I've found the best way to check is to just pull them up. If they're normal, they'll wander around a bit and reroot themselves. If they aren't... well, you'd better be ready for a fight!