<Li> John Tremayne, son of John Hearle Tremayne </Li> <Li> John Claude Lewis Tremayne, son of John Tremayne and better known as "Jack" </Li> <P> Two estate plans, dating from 1777 and sometime before 1810, show the changes wrought to the Heligan estate during Henry Hawkins' ownership . The first plan shows a predominantly parkland estate, with the site of today's Northern Gardens occupied by a field . The second plan shows the development of shelter belts of trees surrounding the gardens, and the main shape of the Northern Gardens, the Mellon Yard and the Flower Garden are all readily discernible . </P> <P> Henry Hawkins' descendants each made significant contributions to the development of the gardens, including the ornamental plantings along the estate's Long Drive, The Jungle, the hybridising of rhododendrons and their planting around Flora's Green, and the creation of the Italian Garden . </P>

When did the lost gardens of heligan open