Giverny lies in the Seine Valley. In geological times the river dug its valley in the tender limestone.
Now there are cliffs or steep hills on both sides of the river. When the hill faces north, it is covered by woods. When it is well oriented it used to be cultivated when Monet lived in Giverny, 100 years ago.
There were vineyards on the hills. Normandy is not a good place where to grow grapes, but our ancestors tried and made a wine which ranged between ‘almost not drinkable’ generally to ‘not too bad’ the best years.
It is not possible to judge, for it is not possible to taste it anymore. Even the eldest inhabitants of Giverny won’t tell, the vineyards disappeared before World War One. I don’t think anybody really regrets them.