1. Is there a quest associated with Nimroots this time around or should I just go ahead and eat/alchemy them up?

2. What does it mean when a landmark is cleared exactly? I've cleared all of the bandits out of one place put it doesn't say cleared on the map

I would also like to know the answer to these questions

I havent found a quest for ninroots, but i am only level 7 and have pritty much just done whiterun quests, the early companions quests, and one or two mage guild quests.

1. No Nirnroot quest.

2. Cleared means that you killed everything in dungeon/cave etc.