The East grounds of the Botanical Gardens will close to the public at sunset today.The grounds will be closed until 4pm tomorrow, for a private reception honouring the Earl and Countess of Wessex.Masterworks Museum will also be closed as a result of the Royal visit.Said a spokesperson: "We apologise for the inconvenience, but we will re-open on Friday, March 18."Their Royal Highnesses arrive on the Island tonight for a whirlwind trip.