Landscaping. All open areas disturbed by grading or construction activities at any site, lot, tract or parcel shall be contoured to provide drainage and, except for areas used for parking, drives or storage, shall be landscaped with trees, shrubs, or planted ground cover. Such landscaping shall conform with the planting plan approved at the time the building permit was issued. It shall be the owner's responsibility to see that this landscaping is maintained in an attractive and well-kept condition. All adjacent vacant lots, tracts or parcels under the same ownership shall also be properly maintained.