Responses to 1533 and 1535
1533
Start
Spoilers
Ironically, you can find allot more nightshade in Farhaven it's self than you can in the graveyard.
Their are two herb gardens, one is at Adrianus manor, out the exit to the right of the study door and straight ahead, and the other is through the side door of Beotress's hut, which is located just before the northern gate on the right side of the street.
Spoilers
End
1535
Start
Spoilers!
To start the (actually love) quest, you need to find Victoria's note in her bedroom at Nigal's house, then talk to her, she should be on the street right outside the blacksmith.
I think the trigger for the quest only happens after giving Jerome the goblin armor, but I'm not sure.
You'll know when he talks about having to stop work for the day when trying to buy from him, so it's obvious.
As for the secret outpost...
If you head to the fort door in the deepwood ruins, then travel south down the road a bit, you will find an opening on your left, a few steps before the bend in the road. take it, and hang another left at your first opportunity. You should now be on an overgrown path, heading north.
if you take the right turn at the end, and follow the path northward, than you will eventually come to a lake, as long as you stay on the path and avoid the exits (their all bandit cashes and scenic landscape anyway).
The outpost is directly to the left from where you enter the lake.
Spoilers!
End