For grass: get your sickle out of your tool box, then ue it with X.
For weeds: pick up with A, then throw on grass (doesn't count as littering unless you throw it on the sidewalks) or throw it away. (I got the garbage can note by throwing 20 weeds away!)
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You can find the moon stone in Harvest Moon Magical melody in the Cave. (I don't believe that their are moon stones in the underground lake, but hey it is wroth a shot.)
You can't.
Harvest Moon Magical Melody; available for Game-cube and Wii.
you can't in that game.