Online booking humble administrators garden

Hello from Spain,to visit administrators garden and lion grove garden pre onlinebooking is necessary or can we buy our tickets on the parkentrance?I can't find the officialwebsite of the gardens in the internet.where else online booking in english is posible?the visit is planned for 16th of april 2020,or can we get the tickets from your company? Thank you and best regards Vera Peichl