As "Grand Harlingen Garden" does not exist, there is no recommended best time to visit.
As "Grand Harlingen Garden" is not a known public attraction, a best time to visit cannot be provided. For genuine garden attractions in the Netherlands, the optimal visiting time often depends on seasonal plant blooms and weather conditions.
Spring (April to June) is typically excellent for bulb flowers and new growth, while summer (July to August) showcases lush greenery and broader floral displays. Early autumn (September to October) can offer beautiful foliage colors. Weekdays, particularly mornings, are usually less crowded than weekends. It is always recommended to check the specific garden's blooming calendar or official website for peak periods and opening hours.