Landscaping of open areas. All yard areas not utilized for parking facilities, driveways, gardens, the planting of trees or shrubs, flower, vegetable or herb beds or similar uses shall be seeded, sodded or landscaped within a reasonable period of time. The phrase "a reasonable period of time" shall be interpreted to be within 30 days after construction activities are completed, unless those activities are completed between November 1 and April 1. In such case, the required sodding or seeding must occur within 30 days of April 1.